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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title>SQLClient documentation</title>
</head>
<body>
<font face="serif">
<h1><a name="title$SQLClient">SQLClient documentation</a></h1>
<h3>Authors</h3>
<dl>
<dt>Richard Frith-Macdonald (<a href="mailto:rfm@gnu.org"><code>rfm@gnu.org</code></a>)</dt>
<dd>
</dd>
</dl>
<p><b>Version:</b> 37913</p>
<p><b>Date:</b> 2014-05-27 16:22:35 +0100 (Tue, 27 May 2014)</p>
<p><b>Copyright:</b> (C) 2004 Free Software Foundation, Inc.</p>
<div>
<hr width="50%" align="left" />
<h3>Contents -</h3>
<ol>
<li>
<a href="#001000000000">The SQLClient library</a>
</li>
<li>
<a href="#001001000000">What is the SQLClient library?</a>
</li>
<li>
<a href="#001002000000">What backend bundles are available?</a>
</li>
<li>
<a href="#001003000000">Where can you get it? How can you install it?</a>
</li>
<li>
<a href="#002000000000">Software documentation for the SQLClient class</a>
</li>
<li>
<a href="#003000000000">Software documentation for the SQLDictionaryBuilder
class</a>
</li>
<li>
<a href="#004000000000">Software documentation for the SQLRecord class</a>
</li>
<li>
<a href="#005000000000">Software documentation for the SQLSetBuilder class</a>
</li>
<li>
<a href="#006000000000">Software documentation for the SQLSingletonBuilder
class</a>
</li>
<li>
<a href="#007000000000">Software documentation for the SQLTransaction class</a>
</li>
<li>
<a href="#008000000000">Software documentation for the SQLClient(Caching)
category</a>
</li>
<li>
<a href="#009000000000">Software documentation for the SQLClient(Convenience)
category</a>
</li>
<li>
<a href="#010000000000">Software documentation for the SQLClient(Logging)
category</a>
</li>
<li>
<a href="#011000000000">Software documentation for the
SQLClient(Notifications) category</a>
</li>
<li>
<a href="#012000000000">Software documentation for the SQLClient(Subclass)
category</a>
</li>
<li>
<a href="#013000000000">SQLClient constants</a>
</li>
<li>
<a href="#014000000000">SQLClient variables</a>
</li>
<li>
<a href="#015000000000">SQLClient functions</a>
</li>
</ol>
<hr width="50%" align="left" />
</div>
<h1><a name="001000000000">The SQLClient library</a></h1>
<h2><a name="001001000000">What is the SQLClient library?</a></h2>
<p>
The SQLClient library is designed to provide a simple
interface to SQL databases for GNUstep
applications. It does not attempt the sort of
abstraction provided by the much more
sophisticated GDL2 library, but rather allows
applications to directly execute SQL queries and
statements.
</p>
<p>
SQLClient provides for the Objective-C programmer
much the same thing that JDBC provides for the Java
programmer (though SQLClient is a bit faster,
easier to use, and easier to add new database backends
for than JDBC).
</p>
<p>
The major features of the SQLClient library are -
</p>
<ul>
<li>
Simple API for executing queries and statements... a
variable length sequence of comma separated
strings and other objects (NSNumber, NSDate,
NSData) are concatenated into a single SQL
statement and executed.
</li>
<li>
Simple API
<a rel="gsdoc" href="#class$SQLTransaction">SQLTransaction</a>
)for combining multiple SQL statements into a single
transaction which can be used to minimise
client-server interactions to get the best
possible performance from your database.
</li>
<li>
Supports multiple sumultaneous named connections
to a database server in a thread-safe manner. <br />
</li>
<li>
Supports multiple simultaneous connections to
different database servers with backend driver
bundles loaded for different database engines.
Clear, simple subclassing of the abstract base
class to enable easy implementation of new backend
bundles.
</li>
<li>
Configuration for all connections held in
one place and referenced by connection name for ease
of configuration control. Changes via NSUserDefaults
can even allow reconfiguration of client instances
within a running application.
</li>
<li>
Thread safe operation... The base class supports
locking such that a single instance can be shared
between multiple threads.
</li>
<li>
Support for standalone web applications... eg to
allow data to be added to the database by people
posting web forms to the application.
</li>
<li>
Supports notification of connection to and
disconnection from the database server.
</li>
</ul>
<h2><a name="001002000000">
What backend bundles are available?
</a></h2>
<p>
Current backend bundles are -
</p>
<ul>
<li>
ECPG - a bundle using the embedded SQL interface for
postgres. <br /> This is based on a similar
code which was in production use for over eighteen
months, so it should be reliable, but
inefficient.
</li>
<li>
Postgres - a bundle using the libpq native
interface for postgres. <br /> This is the
preferred backend as it allows 'SELECT FOR
UPDATE', which the ECPG backend cannot support
due to limitations in the postgres implementation of
cursors. The code is now well tested and known
to be efficient.
</li>
<li>
MySQL - a bundle using the mysqlclient library for
*recent* MySQL. <br /> I don't use MySQL... but
the test program ran successfully with a vanilla
install of the MySQL packages for recent Debian
unstable.
</li>
<li>
SQLite - a bundle using the sqlite3 library which
supports an SQL-like API for direct access to a
database file (rather than acting as a client of
a database server process). <br /> Not as functional as
the other backends (doesn't support dates for
instance), but good enough for many purposes
and very 'lightweight'. See http://www.sqlite.org
</li>
<li>
Oracle - a bundle using embedded SQL for Oracle.
<br /> Completely untested... may even need some
work to compile... but this *is* based on code which
was working about a year ago. <br /> No support for
BLOBs yet.
</li>
</ul>
<h2><a name="001003000000">
Where can you get it? How can you install it?
</a></h2>
<p>
The SQLClient library is currently only available via
CVS from the GNUstep CVS repository. <br /> See
<https://savannah.gnu.org/cvs/?group=gnustep>
<br /> You need to check out
<code>gnustep/dev-libs/SQLClient</code>
</p>
<p>
To build this library you must have a basic GNUstep
environment set up...
</p>
<ul>
<li>
The gnustep-make package must have been built and
installed.
</li>
<li>
The gnustep-base package must have been built and
installed.
</li>
<li>
The Performance library (from the dev-libs area in
GNUstep CVS) must have been built and installed.
</li>
<li>
If this environment is in place, all you should need
to do is run 'make' to configure and build the
library, 'make install' to install it.
</li>
<li>
Then you can run the test programs.
</li>
<li>
Your most likely problems are that the configure
script may not detect the database libraries you
want... Please figure out how to modify
<code>configure.ac</code> so that it will detect
the required headers and libraries on your system,
and supply na patch.
</li>
<li>
Once the library is installed, you can include the
header file
<code><SQLClient/SQLClient.h%gt;</code> and
link your programs with the <code>SQLClient</code>
library to use it.
</li>
</ul>
<p>
Bug reports, patches, and contributions (eg a backend
bundle for a new database) should be entered on the
GNUstep project page
<http://savannah.gnu.org/projects/gnustep>
and the bug reporting page
<http://savannah.gnu.org/bugs/?group=gnustep>
</p>
<h1><a name="002000000000">
Software documentation for the SQLClient class
</a></h1>
<h2><a name="class$SQLClient">SQLClient</a> : NSObject</h2>
<blockquote class="declared">
<dl>
<dt><b>Declared in:</b></dt>
<dd>SQLClient.h</dd>
</dl>
</blockquote>
<div class="desc">
</p>
<p>
The SQLClient class encapsulates dynamic SQL access to
relational database systems. A shared instance
of the class is used for each database (as identified by
the name of the database), and the number of
simultanous database connections is managed
too.
</p>
<p>
</p>
<p>
SQLClient is an abstract base class... when you
create an instance of it, you are actually creating
an instance of a concrete subclass whose implementation
is loaded from a bundle.
</p>
<p>
</div>
<hr width="50%" align="left" />
<a href="#_SQLClient_ivars">Instance Variables</a>
<br/><br/>
<b>Method summary</b>
<ul>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Caching)-cache">-cache</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Caching)-cache$query$,...">-cache:query:,...</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Caching)-cache$query$with$">-cache:query:with:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Caching)-cache$simpleQuery$">-cache:simpleQuery:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Caching)-cache$simpleQuery$recordType$listType$">-cache:simpleQuery:recordType:listType:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Caching)-setCache$">-setCache:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Caching)-setCacheThread$">-setCacheThread:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Convenience)-batch$">-batch:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Convenience)-columns$">-columns:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Convenience)-queryRecord$,...">-queryRecord:,...</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Convenience)-queryString$,...">-queryString:,...</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Convenience)-singletons$">-singletons:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Convenience)-transaction">-transaction</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Logging)+debugging">+debugging</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Logging)+durationLogging">+durationLogging</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Logging)+setDebugging$">+setDebugging:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Logging)+setDurationLogging$">+setDurationLogging:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Logging)-debug$,...">-debug:,...</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Logging)-debugging">-debugging</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Logging)-durationLogging">-durationLogging</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Logging)-setDebugging$">-setDebugging:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Logging)-setDurationLogging$">-setDurationLogging:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Notifications)-addObserver$selector$name$">-addObserver:selector:name:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Notifications)-postNotificationName$payload$">-postNotificationName:payload:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Notifications)-removeObserver$name$">-removeObserver:name:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Subclass)-backendConnect">-backendConnect</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Subclass)-backendDisconnect">-backendDisconnect</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Subclass)-backendExecute$">-backendExecute:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Subclass)-backendListen$">-backendListen:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Subclass)-backendNotify$payload$">-backendNotify:payload:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Subclass)-backendQuery$">-backendQuery:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Subclass)-backendQuery$recordType$listType$">-backendQuery:recordType:listType:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Subclass)-backendUnlisten$">-backendUnlisten:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Subclass)-copyEscapedBLOB$into$">-copyEscapedBLOB:into:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Subclass)-insertBLOBs$intoStatement$length$withMarker$length$giving$">-insertBLOBs:intoStatement:length:withMarker:length:giving:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Subclass)-lengthOfEscapedBLOB$">-lengthOfEscapedBLOB:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient+allClients">+allClients</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient+clientWithConfiguration$name$">+clientWithConfiguration:name:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient+existingClient$">+existingClient:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient+maxConnections">+maxConnections</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient+purgeConnections$">+purgeConnections:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient+setMaxConnections$">+setMaxConnections:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient-begin">-begin</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient-buildQuery$,...">-buildQuery:,...</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient-buildQuery$with$">-buildQuery:with:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient-clientName">-clientName</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient-commit">-commit</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient-connect">-connect</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient-connected">-connected</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient-database">-database</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient-disconnect">-disconnect</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient-execute$,...">-execute:,...</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient-execute$with$">-execute:with:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient-initWithConfiguration$">-initWithConfiguration:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient-initWithConfiguration$name$">-initWithConfiguration:name:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient-isEqual$">-isEqual:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient-isInTransaction">-isInTransaction</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient-lastOperation">-lastOperation</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient-name">-name</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient-password">-password</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient-query$,...">-query:,...</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient-query$with$">-query:with:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient-quote$">-quote:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient-quoteBigInteger$">-quoteBigInteger:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient-quoteCString$">-quoteCString:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient-quoteChar$">-quoteChar:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient-quoteFloat$">-quoteFloat:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient-quoteInteger$">-quoteInteger:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient-quoteString$">-quoteString:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient-quotef$,...">-quotef:,...</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient-rollback">-rollback</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient-setDatabase$">-setDatabase:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient-setName$">-setName:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient-setPassword$">-setPassword:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient-setShouldTrim$">-setShouldTrim:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient-setUser$">-setUser:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient-simpleExecute$">-simpleExecute:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient-simpleQuery$">-simpleQuery:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient-simpleQuery$recordType$listType$">-simpleQuery:recordType:listType:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient-user">-user</a></li>
</ul>
<hr width="50%" align="left" />
<div class="method">
<h3><a name="method$SQLClient+allClients">allClients </a></h3>
+ (NSArray*) <b>allClients</b>;<br />
<div class="desc">
Returns an array containing all the SQLClient
instances.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient+clientWithConfiguration$name$">clientWithConfiguration: name: </a></h3>
+ (<a rel="gsdoc" href="#class$SQLClient">SQLClient</a>*) <b>clientWithConfiguration:</b> (NSDictionary*)config<b> name:</b> (NSString*)reference;<br />
<div class="desc">
Return an existing SQLClient instance (using
+existingClient:) if possible, or creates
one, initialises it using
<a rel="gsdoc" href="#method$SQLClient-initWithConfiguration$name$">
-initWithConfiguration:name:
</a>
, and returns the new instance (autoreleased). <br />
Returns <code>nil</code> on failure.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient+existingClient$">existingClient: </a></h3>
+ (<a rel="gsdoc" href="#class$SQLClient">SQLClient</a>*) <b>existingClient:</b> (NSString*)reference;<br />
<div class="desc">
Return an existing SQLClient instance for the
specified name if one exists, otherwise returns
<code>nil</code>.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient+maxConnections">maxConnections </a></h3>
+ (unsigned int) <b>maxConnections</b>;<br />
<div class="desc">
Return the maximum number of simultaneous database
connections permitted (set by
<a rel="gsdoc" href="#method$SQLClient+setMaxConnections$">
+setMaxConnections:
</a>
and defaults to 8)
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient+purgeConnections$">purgeConnections: </a></h3>
+ (void) <b>purgeConnections:</b> (NSDate*)since;<br />
<div class="desc">
</p>
<p>
Use this method to reduce the number of database
connections currently active so that it is
less than the limit set by the
<a rel="gsdoc" href="#method$SQLClient+setMaxConnections$">
+setMaxConnections:
</a>
method. This mechanism is used internally by the
class to ensure that, when it is about to open a
new connection, the limit is not exceeded.
</p>
<p>
</p>
<p>
If <var>since</var> is not <code>nil</code>, then any
connection which has not been used more
recently than that date is disconnected anyway.
<br /> You can (and probably should) use this
periodically to purge idle connections, but
you can also pass a date in the future to close all
connections.
</p>
<p>
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient+setMaxConnections$">setMaxConnections: </a></h3>
+ (void) <b>setMaxConnections:</b> (unsigned int)c;<br />
<div class="desc">
</p>
<p>
Set the maximum number of simultaneous database
connections permitted (defaults to 8 and may
not be set less than 1).
</p>
<p>
</p>
<p>
This value is used by the
<a rel="gsdoc" href="#method$SQLClient+purgeConnections$">
+purgeConnections:
</a>
method to determine how many connections should be
disconnected when it is called.
</p>
<p>
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient-begin">begin </a></h3>
- (void) <b>begin</b>;<br />
<div class="desc">
Start a transaction for this database client. <br />
You <strong>must</strong> match this with either a
<a rel="gsdoc" href="#method$SQLClient-commit">
-commit
</a>
or a <a rel="gsdoc" href="#method$SQLClient-rollback">-rollback</a>
.
<br />
</p>
<p>
Normally, if you execute an SQL statement
without using this method first, the
<em>autocommit</em> feature is employed, and the
statement takes effect immediately. Use of this
method permits you to execute several statements
in sequence, and only have them take effect (as a
single operation) when you call the
<a rel="gsdoc" href="#method$SQLClient-commit">
-commit
</a>
method.
</p>
<p>
</p>
<p>
NB. You must <strong>not</strong> execute an SQL
statement which would start a transaction
directly... use only this method.
</p>
<p>
</p>
<p>
Where possible, consider using the
<a rel="gsdoc" href="#class$SQLTransaction">SQLTransaction</a>
class rather than calling <a rel="gsdoc" href="#method$SQLClient-begin">-begin</a>
<a rel="gsdoc" href="#method$SQLClient-commit">-commit</a>
or <a rel="gsdoc" href="#method$SQLClient-rollback">-rollback</a>
yourself. </p>
<p>
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient-buildQuery$,...">buildQuery: ,...</a></h3>
- (NSString*) <b>buildQuery:</b> (NSString*)stmt<b>,...</b>;<br />
<div class="desc">
</p>
<p>
Build an sql query string using the supplied
arguments.
</p>
<p>
</p>
<p>
This method has at least one argument, the string
starting the query to be executed (which must
have the prefix 'select ').
</p>
<p>
</p>
<p>
Additional arguments are a <code>nil</code>
terminated list which also be strings, and
these are appended to the statement. <br /> Any
string arguments are assumed to have been quoted
appropriately already, but non-string
arguments are automatically quoted using the
<a rel="gsdoc" href="#method$SQLClient-quote$">
-quote:
</a>
method.
</p>
<p>
<pre>
sql = [db buildQuery: @"SELECT Name FROM ", table, nil];
</pre>
</p>
<p>
Upon error, an exception is raised.
</p>
<p>
</p>
<p>
The method returns a string containing sql suitable
for passing to the
<a rel="gsdoc" href="#method$SQLClient-simpleQuery$recordType$listType$">-simpleQuery:recordType:listType:</a>
or <a rel="gsdoc" href="#method$SQLClient(Caching)-cache$simpleQuery$recordType$listType$">-cache:simpleQuery:recordType:listType:</a>
methods.
</p>
<p>
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient-buildQuery$with$">buildQuery: with: </a></h3>
- (NSString*) <b>buildQuery:</b> (NSString*)stmt<b> with:</b> (NSDictionary*)values;<br />
<div class="desc">
Takes the query statement and substitutes in
<var>values</var> from the dictionary where markup of
the format {key} is found. <br /> Returns the resulting
query string.
<pre>
sql = [db buildQuery: @"SELECT Name FROM {Table} WHERE ID = {ID}"
with: values];
</pre>
</p>
<p>
Any non-string <var>values</var> in the dictionary
will be replaced by the results of the
<a rel="gsdoc" href="#method$SQLClient-quote$">
-quote:
</a>
method. <br /> The markup format may also be
{key?default} where <em>default</em> is a
string to be used if there is no value for the
<em>key</em> in the dictionary.
</p>
<p>
</p>
<p>
The method returns a string containing sql suitable
for passing to the
<a rel="gsdoc" href="#method$SQLClient-simpleQuery$recordType$listType$">-simpleQuery:recordType:listType:</a>
or <a rel="gsdoc" href="#method$SQLClient(Caching)-cache$simpleQuery$recordType$listType$">-cache:simpleQuery:recordType:listType:</a>
methods.
</p>
<p>
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient-clientName">clientName </a></h3>
- (NSString*) <b>clientName</b>;<br />
<div class="desc">
Return the client name for this instance. <br />
Normally this is useful only for
debugging/reporting purposes, but if
you are using multiple instances of this class in your
application, and you are using embedded SQL,
you will need to use this method to fetch the
client/connection name and store its
C-string representation in a variable
'connectionName' declared to the sql
preprocessor, so you can then have statements
of the form - 'exec sql at :connectionName...'.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient-commit">commit </a></h3>
- (void) <b>commit</b>;<br />
<div class="desc">
Complete a transaction for this database client.
<br /> This <strong>must</strong> match an earlier
<a rel="gsdoc" href="#method$SQLClient-begin">
-begin
</a>
.
</p>
<p>
NB. You must <strong>not</strong> execute an SQL
statement which would commit or rollback a
transaction directly... use only this method
or the
<a rel="gsdoc" href="#method$SQLClient-rollback">
-rollback
</a>
method.
</p>
<p>
</p>
<p>
Where possible, consider using the
<a rel="gsdoc" href="#class$SQLTransaction">SQLTransaction</a>
class rather than calling <a rel="gsdoc" href="#method$SQLClient-begin">-begin</a>
<a rel="gsdoc" href="#method$SQLClient-commit">-commit</a>
or <a rel="gsdoc" href="#method$SQLClient-rollback">-rollback</a>
yourself. </p>
<p>
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient-connect">connect </a></h3>
- (BOOL) <b>connect</b>;<br />
<div class="desc">
If the <em>connected</em> instance variable is
<code>NO</code>, this method calls
<a rel="gsdoc" href="#method$SQLClient(Subclass)-backendConnect">
-backendConnect
</a>
to ensure that there is a connection to the database
server established. Returns the result. <br />
Performs any necessary locking for thread safety.
<br /> This method also counts the number of
consecutive failed connection attempts. A delay
is enforced between each connection attempt, with the
length of the delay growing with each failure. This
ensures that applications which fail to deal with
connection failures, and just keep trying to
reconnect, will not overload the system/server.
<br /> The maximum delay is 30 seconds, so when the
database server is restarted, the application can
reconnect reasonably quickly.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient-connected">connected </a></h3>
- (BOOL) <b>connected</b>;<br />
<div class="desc">
Return a flag to say whether a connection to the
database server is currently live. This is mostly
useful for debug/reporting, but is used internally
to keep track of active connections.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient-database">database </a></h3>
- (NSString*) <b>database</b>;<br />
<div class="desc">
Return the database name for this instance (or
<code>nil</code>).
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient-disconnect">disconnect </a></h3>
- (void) <b>disconnect</b>;<br />
<div class="desc">
If the <em>connected</em> instance variable is
<code>YES</code>, this method calls
<a rel="gsdoc" href="#method$SQLClient(Subclass)-backendDisconnect">
-backendDisconnect
</a>
to ensure that the connection to the database server is
dropped. <br /> Performs any necessary locking for
thread safety.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient-execute$,...">execute: ,...</a></h3>
- (NSInteger) <b>execute:</b> (NSString*)stmt<b>,...</b>;<br />
<div class="desc">
Perform arbitrary operation
<em>which does not return any value.</em> <br /> This
arguments to this method are a <code>nil</code>
terminated list which are concatenated in the
manner of the
<a rel="gsdoc" href="#method$SQLClient-query$,...">
-query:,...
</a>
method. <br /> Any string arguments are assumed to
have been quoted appropriately already, but non-string
arguments are automatically quoted using the
<a rel="gsdoc" href="#method$SQLClient-quote$">
-quote:
</a>
method.
<pre>
[db execute: @"UPDATE ", table, @" SET Name = ",
myName, " WHERE ID = ", myId, nil];
</pre>
Where the database backend support it, this method
returns the count of the number of rows to which
the operation applied. Otherwise this returns -1.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient-execute$with$">execute: with: </a></h3>
- (NSInteger) <b>execute:</b> (NSString*)stmt<b> with:</b> (NSDictionary*)values;<br />
<div class="desc">
Takes the statement and substitutes in
<var>values</var> from the dictionary where markup of
the format {key} is found. <br /> Passes the result to
the
<a rel="gsdoc" href="#method$SQLClient-execute$,...">
-execute:,...
</a>
method.
<pre>
[db execute: @"UPDATE {Table} SET Name = {Name} WHERE ID = {ID}"
with: values];
</pre>
Any non-string <var>values</var> in the dictionary will
be replaced by the results of the
<a rel="gsdoc" href="#method$SQLClient-quote$">
-quote:
</a>
method. <br /> The markup format may also be
{key?default} where <em>default</em> is a
string to be used if there is no value for the
<em>key</em> in the dictionary. <br /> Where the
database backend support it, this method returns
the count of the number of rows to which the operation
applied. Otherwise this returns -1.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient-initWithConfiguration$">initWithConfiguration: </a></h3>
- (id) <b>initWithConfiguration:</b> (NSDictionary*)config;<br />
<div class="desc">
Calls
<a rel="gsdoc" href="#method$SQLClient-initWithConfiguration$name$">
-initWithConfiguration:name:
</a>
passing a <code>nil</code> reference name.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient-initWithConfiguration$name$">initWithConfiguration: name: </a></h3>
- (id) <b>initWithConfiguration:</b> (NSDictionary*)config<b> name:</b> (NSString*)reference;<br />
<div class="desc">
Initialise using the supplied configuration, or
if that is <code>nil</code>, try to use values from
NSUserDefaults (and automatically update
when the defaults change). <br /> Uses the
<var>reference</var> name to determine configuration
information... and if a <code>nil</code> name
is supplied, defaults to the value of SQLClientName in
the configuration dictionary (or in the standard user
defaults). If there is no value for
SQLClientName, uses the string 'Database'.
<br /> If a SQLClient instance already exists with
the name used for this instance, the receiver is
deallocated and the existing instance is
retained and returned... there may only ever be
one instance for a particular <var>reference</var>
name. <br /> <br /> The <var>config</var> argument
(or the SQLClientReferences user default) is a
dictionary with names as keys and dictionaries
as its values. Configuration entries from the dictionary
corresponding to the database client are used
if possible, general entries are used otherwise. <br />
Database... is the name of the database to use, if
it is missing then 'Database' may be used instead.
<br /> User... is the name of the database user to
use, if it is missing then 'User' may be used instead.
<br /> Password... is the name of the database user
password, if it is missing then 'Password' may be
used instead. <br /> ServerType... is the name of the
backend server to be used... by convention the name
of a bundle containing the interface to that backend. If
this is missing then 'Postgres' is used. <br /> The
database name may be of the format
'name@host:port' when you wish to connect
to a database on a different host over the network.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient-isEqual$">isEqual: </a></h3>
- (BOOL) <b>isEqual:</b> (id)other;<br />
<div class="desc">
Two clients are considered equal if they refer to the
same database and are logged in as the same database
user using the same protocol. These are the general
criteria for transactions to be compatoible so
that an SQLTransaction object generated by one client
can be used by the <var>other</var>.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient-isInTransaction">isInTransaction </a></h3>
- (BOOL) <b>isInTransaction</b>;<br />
<div class="desc">
Return the state of the flag indicating whether the
library thinks a transaction is in progress. This
flag is normally maintained by
<a rel="gsdoc" href="#method$SQLClient-begin">
-begin
</a>
, <a rel="gsdoc" href="#method$SQLClient-commit">-commit</a>
, and
<a rel="gsdoc" href="#method$SQLClient-rollback">
-rollback
</a>
.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient-lastOperation">lastOperation </a></h3>
- (NSDate*) <b>lastOperation</b>;<br />
<div class="desc">
Returns the date/time stamp of the last database
operation performed by the receiver, or
<code>nil</code> if no operation has ever been done
by it. <br /> Simply connecting to or disconnecting from
the databsse does not count as an operation.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient-name">name </a></h3>
- (NSString*) <b>name</b>;<br />
<div class="desc">
Return the database reference name for this instance
(or <code>nil</code>).
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient-password">password </a></h3>
- (NSString*) <b>password</b>;<br />
<div class="desc">
Return the database password for this instance (or
<code>nil</code>).
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient-query$,...">query: ,...</a></h3>
- (NSMutableArray*) <b>query:</b> (NSString*)stmt<b>,...</b>;<br />
<div class="desc">
</p>
<p>
Perform arbitrary query
<em>which returns values.</em>
</p>
<p>
</p>
<p>
This method handles its arguments in the same way as
the
<a rel="gsdoc" href="#method$SQLClient-buildQuery$,...">
-buildQuery:,...
</a>
method and returns the result of the query.
</p>
<p>
<pre>
result = [db query: @"SELECT Name FROM ", table, nil];
</pre>
</p>
<p>
Upon error, an exception is raised.
</p>
<p>
</p>
<p>
The query returns an array of records (each of which
is represented by an SQLRecord object).
</p>
<p>
</p>
<p>
Each SQLRecord object contains one or more fields,
in the order in which they occurred in the query.
Fields may also be retrieved by name.
</p>
<p>
</p>
<p>
NULL field items are returned as NSNull objects.
</p>
<p>
</p>
<p>
Most other field items are returned as NSString
objects.
</p>
<p>
</p>
<p>
Date and timestamp field items are returned as
NSDate objects.
</p>
<p>
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient-query$with$">query: with: </a></h3>
- (NSMutableArray*) <b>query:</b> (NSString*)stmt<b> with:</b> (NSDictionary*)values;<br />
<div class="desc">
Takes the query statement and substitutes in
<var>values</var> from the dictionary (in the same
manner as the
<a rel="gsdoc" href="#method$SQLClient-buildQuery$with$">
-buildQuery:with:
</a>
method) then executes the query and returns the
response. <br />
<pre>
result = [db query: @"SELECT Name FROM {Table} WHERE ID = {ID}"
with: values];
</pre>
Any non-string <var>values</var> in the dictionary will
be replaced by the results of the
<a rel="gsdoc" href="#method$SQLClient-quote$">
-quote:
</a>
method. <br /> The markup format may also be
{key?default} where <em>default</em> is a
string to be used if there is no value for the
<em>key</em> in the dictionary.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient-quote$">quote: </a></h3>
- (NSString*) <b>quote:</b> (id)obj;<br />
<div class="desc">
Convert an object to a string suitable for use in
an SQL query. <br /> Normally the
<a rel="gsdoc" href="#method$SQLClient-execute$,...">
-execute:,...
</a>
, and
<a rel="gsdoc" href="#method$SQLClient-query$,...">
-query:,...
</a>
methods will call this method automatically for
everything apart from string objects. <br />
Strings have to be handled specially, because they
are used both for parts of the SQL command, and as
values (where they need to be quoted). So where you
need to pass a string value which needs quoting, you
must call this method explicitly. <br /> Subclasses
may override this method to provide appropriate quoting
for types of object which need database backend
specific quoting conventions. However, the defalt
implementation should be OK for most cases.
<br /> This method makes use of
<a rel="gsdoc" href="#method$SQLClient-quoteString$">
-quoteString:
</a>
to quote literal strings. <br /> The base class
implementation formats NSDate objects as
<br /> YYYY-MM-DD hh:mm:ss.mmm ?ZZZZ <br /> NSData
objects are not quoted... they must not appear in
queries, and where used for insert/update
operations, they need to be passed to the
<a rel="gsdoc" href="#method$SQLClient(Subclass)-backendExecute$">
-backendExecute:
</a>
method unchanged. <br /> For a <code>nil</code>
object, we return NULL. <br /> For a number, we
simply convert directly to a string. <br /> For a
date, we convert to the text format used by the
database, and add leading and trailing quotes.
<br /> For a data object, we don't quote... the
other parts of the code need to know they have an
NSData object and pass it on unchanged to the
<a rel="gsdoc" href="#method$SQLClient(Subclass)-backendExecute$">
-backendExecute:
</a>
method. <br /> Just in case an NSNull subclass has
been created by someone. The normal NSNull instance
should have been handled earlier. <br /> For an
NSArray or NSSet, we produce a bracketed list of
the (quoted) objects in the array. <br /> For any other
type of data, we just produce a quoted string
representation of the objects description.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient-quoteBigInteger$">quoteBigInteger: </a></h3>
- (NSString*) <b>quoteBigInteger:</b> (int64_t)i;<br />
<div class="desc">
Convert a big (64 bit) integer to a string suitable
for use in an SQL query.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient-quoteCString$">quoteCString: </a></h3>
- (NSString*) <b>quoteCString:</b> (const char*)s;<br />
<div class="desc">
Convert a 'C' string to a string suitable for use
in an SQL query by using
<a rel="gsdoc" href="#method$SQLClient-quoteString$">
-quoteString:
</a>
to convert it to a literal string format. <br /> NB. a
null pointer is treated as an empty string.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient-quoteChar$">quoteChar: </a></h3>
- (NSString*) <b>quoteChar:</b> (char)c;<br />
<div class="desc">
Convert a single character to a string suitable for
use in an SQL query by using
<a rel="gsdoc" href="#method$SQLClient-quoteString$">
-quoteString:
</a>
to convert it to a literal string format. <br /> NB. a
nul character is not allowed and will cause an
exception.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient-quoteFloat$">quoteFloat: </a></h3>
- (NSString*) <b>quoteFloat:</b> (float)f;<br />
<div class="desc">
Convert a <strong>float</strong> to a string
suitable for use in an SQL query.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient-quoteInteger$">quoteInteger: </a></h3>
- (NSString*) <b>quoteInteger:</b> (int)i;<br />
<div class="desc">
Convert an integer to a string suitable for use in
an SQL query.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient-quoteString$">quoteString: </a></h3>
- (NSString*) <b>quoteString:</b> (NSString*)s;<br />
<div class="desc">
Convert a string to a form suitable for use as a
string literal in an SQL query. <br /> Subclasses
may override this for non-standard literal string
quoting conventions.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient-quotef$,...">quotef: ,...</a></h3>
- (NSString*) <b>quotef:</b> (NSString*)fmt<b>,...</b>;<br />
<div class="desc">
Produce a quoted string from the supplied arguments
(printf style).
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient-rollback">rollback </a></h3>
- (void) <b>rollback</b>;<br />
<div class="desc">
Revert a transaction for this database client.
<br /> If there is no transaction in progress, this
method does nothing. <br />
</p>
<p>
NB. You must <strong>not</strong> execute an SQL
statement which would commit or rollback a
transaction directly... use only this method
or the
<a rel="gsdoc" href="#method$SQLClient-rollback">
-rollback
</a>
method.
</p>
<p>
</p>
<p>
Where possible, consider using the
<a rel="gsdoc" href="#class$SQLTransaction">SQLTransaction</a>
class rather than calling <a rel="gsdoc" href="#method$SQLClient-begin">-begin</a>
<a rel="gsdoc" href="#method$SQLClient-commit">-commit</a>
or <a rel="gsdoc" href="#method$SQLClient-rollback">-rollback</a>
yourself. </p>
<p>
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient-setDatabase$">setDatabase: </a></h3>
- (void) <b>setDatabase:</b> (NSString*)s;<br />
<div class="desc">
Set the database host/name for this object. <br /> This
is called automatically to configure the connection...
you normally shouldn't need to call it yourself.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient-setName$">setName: </a></h3>
- (void) <b>setName:</b> (NSString*)s;<br />
<div class="desc">
Set the database reference name for this object. This
is used to differentiate between multiple connections to
the database. <br /> This is called automatically to
configure the connection... you normally
shouldn't need to call it yourself. <br /> NB.
attempts to change the name of an instance to that
of an existing instance are ignored.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient-setPassword$">setPassword: </a></h3>
- (void) <b>setPassword:</b> (NSString*)s;<br />
<div class="desc">
Set the database password for this object. <br /> This
is called automatically to configure the connection...
you normally shouldn't need to call it yourself.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient-setShouldTrim$">setShouldTrim: </a></h3>
- (void) <b>setShouldTrim:</b> (BOOL)aFlag;<br />
<div class="desc">
Sets an internal flag to indicate whether leading and
trailing white space characters should be removed
from values retrieved from the database by the
receiver.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient-setUser$">setUser: </a></h3>
- (void) <b>setUser:</b> (NSString*)s;<br />
<div class="desc">
Set the database user for this object. <br /> This is
called automatically to configure the connection...
you normally shouldn't need to call it yourself.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient-simpleExecute$">simpleExecute: </a></h3>
- (NSInteger) <b>simpleExecute:</b> (NSArray*)info;<br />
<div class="desc">
Calls
<a rel="gsdoc" href="#method$SQLClient(Subclass)-backendExecute$">
-backendExecute:
</a>
in a safe manner. <br /> Handles locking. <br />
Maintains
<a rel="gsdoc" href="#method$SQLClient-lastOperation">
-lastOperation
</a>
date. <br /> Returns the result of
<a rel="gsdoc" href="#method$SQLClient(Subclass)-backendExecute$">
-backendExecute:
</a>
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient-simpleQuery$">simpleQuery: </a></h3>
- (NSMutableArray*) <b>simpleQuery:</b> (NSString*)stmt;<br />
<div class="desc">
Calls
<a rel="gsdoc" href="#method$SQLClient-simpleQuery$recordType$listType$">
-simpleQuery:recordType:listType:
</a>
with the default record class and default array class.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient-simpleQuery$recordType$listType$">simpleQuery: recordType: listType: </a></h3>
- (NSMutableArray*) <b>simpleQuery:</b> (NSString*)stmt<b> recordType:</b> (id)rtype<b> listType:</b> (id)ltype;<br />
<div class="desc">
Calls
<a rel="gsdoc" href="#method$SQLClient(Subclass)-backendQuery$recordType$listType$">-backendQuery:recordType:listType:</a>
in a safe manner. <br /> Handles locking. <br /> Maintains <a rel="gsdoc" href="#method$SQLClient-lastOperation">-lastOperation</a>
date. <br /> The value of <var>rtype</var> must respond to the <a rel="gsdoc" href="#method$SQLRecord+newWithValues$keys$count$">[SQLRecord +newWithValues:keys:count:]</a>
method. <br /> If <var>rtype</var> is <code>nil</code> then the
<a rel="gsdoc" href="#class$SQLRecord">SQLRecord</a>
class is used. <br /> The value of <var>ltype</var>
must respond to the
[NSObject +alloc]
method to produce a container which must repond to
the
[NSMutableArray -initWithCapacity:]
method to initialise itsself and the [NSMutableArray -addObject:]
method to add records to the list. <br /> If <var>ltype</var> is <code>nil</code> then the
NSMutableArray
class is used. <br /> This library provides a few
helper classes to provide alternative values for
<var>rtype</var> and <var>ltype</var>.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient-user">user </a></h3>
- (NSString*) <b>user</b>;<br />
<div class="desc">
Return the database user for this instance (or
<code>nil</code>).
</div>
<hr width="25%" align="left" />
</div>
<a name="_SQLClient_ivars"/> <br/><hr width="50%" align="left" />
<h2>Instance Variables for SQLClient Class</h2>
<h3><a name="ivariable$SQLClient*_cache">_cache</a></h3>
@protected GSCache* <b>_cache</b>;<br />
<div class="desc">
The cache for query results <br /> <em>Warning</em> the
underscore at the start of the name of this
instance variable indicates that, even though it
is not technically <em>private</em>, it is intended for
internal use within the package, and you should
not use the variable in other code.
</div>
<hr width="25%" align="left" />
<h3><a name="ivariable$SQLClient*_cacheThread">_cacheThread</a></h3>
@protected NSThread* <b>_cacheThread</b>;<br />
<div class="desc">
Thread for cache queries <br /> <em>Warning</em> the
underscore at the start of the name of this
instance variable indicates that, even though it
is not technically <em>private</em>, it is intended for
internal use within the package, and you should
not use the variable in other code.
</div>
<hr width="25%" align="left" />
<h3><a name="ivariable$SQLClient*_client">_client</a></h3>
@protected NSString* <b>_client</b>;<br />
<div class="desc">
Identifier within backend <br />
<em>Warning</em> the underscore at the start of the
name of this instance variable indicates that, even
though it is not technically <em>private</em>, it is
intended for internal use within the package, and
you should not use the variable in other code.
</div>
<hr width="25%" align="left" />
<h3><a name="ivariable$SQLClient*_connectFails">_connectFails</a></h3>
@protected unsigned int <b>_connectFails</b>;<br />
<div class="desc">
The count of connection failures <br />
<em>Warning</em> the underscore at the start of the
name of this instance variable indicates that, even
though it is not technically <em>private</em>, it is
intended for internal use within the package, and
you should not use the variable in other code.
</div>
<hr width="25%" align="left" />
<h3><a name="ivariable$SQLClient*_database">_database</a></h3>
@protected NSString* <b>_database</b>;<br />
<div class="desc">
The configured database name/host <br />
<em>Warning</em> the underscore at the start of the
name of this instance variable indicates that, even
though it is not technically <em>private</em>, it is
intended for internal use within the package, and
you should not use the variable in other code.
</div>
<hr width="25%" align="left" />
<h3><a name="ivariable$SQLClient*_debugging">_debugging</a></h3>
@protected unsigned int <b>_debugging</b>;<br />
<div class="desc">
The current debugging level <br /> <em>Warning</em> the
underscore at the start of the name of this
instance variable indicates that, even though it
is not technically <em>private</em>, it is intended for
internal use within the package, and you should
not use the variable in other code.
</div>
<hr width="25%" align="left" />
<h3><a name="ivariable$SQLClient*_duration">_duration</a></h3>
@protected NSTimeInterval <b>_duration</b>;<br />
<div class="desc">
<em>Warning</em> the underscore at the start of the
name of this instance variable indicates that, even
though it is not technically <em>private</em>, it is
intended for internal use within the package, and
you should not use the variable in other code.
</div>
<hr width="25%" align="left" />
<h3><a name="ivariable$SQLClient*_extra">_extra</a></h3>
@protected void* <b>_extra</b>;<br />
<div class="desc">
Allow for extensions by allocating memory and
pointing to it from the _extra ivar. That way we
can avoid binary incompatibility between minor
releases. <br /> <em>Warning</em> the underscore
at the start of the name of this instance variable
indicates that, even though it is not technically
<em>private</em>, it is intended for internal use
within the package, and you should not use the
variable in other code.
</div>
<hr width="25%" align="left" />
<h3><a name="ivariable$SQLClient*_inTransaction">_inTransaction</a></h3>
@protected BOOL <b>_inTransaction</b>;<br />
<div class="desc">
A flag indicating whether this instance is currently
within a transaction. This variable must
<em>only</em> be set by the
<a rel="gsdoc" href="#method$SQLClient-begin">
-begin
</a>
, <a rel="gsdoc" href="#method$SQLClient-commit">-commit</a>
or
<a rel="gsdoc" href="#method$SQLClient-rollback">
-rollback
</a>
methods. <br /> Are we inside a transaction?
<br /> <em>Warning</em> the underscore at the start
of the name of this instance variable indicates that,
even though it is not technically <em>private</em>, it
is intended for internal use within the package, and you
should not use the variable in other code.
</div>
<hr width="25%" align="left" />
<h3><a name="ivariable$SQLClient*_lastOperation">_lastOperation</a></h3>
@protected NSTimeInterval <b>_lastOperation</b>;<br />
<div class="desc">
Timestamp of last operation. <br /> Maintained by
<a rel="gsdoc" href="#method$SQLClient-simpleExecute$">
-simpleExecute:
</a>
<a rel="gsdoc" href="#method$SQLClient-simpleQuery$recordType$listType$">
-simpleQuery:recordType:listType:
</a>
and
<a rel="gsdoc" href="#method$SQLClient(Caching)-cache$simpleQuery$recordType$listType$">-cache:simpleQuery:recordType:listType:</a>
Also set for a failed connection attempt, but not reported by the <a rel="gsdoc" href="#method$SQLClient-lastOperation">-lastOperation</a>
method in that case. <br /> <em>Warning</em> the underscore at the start of the name of this instance variable indicates that, even though it is not technically <em>private</em>, it is intended for internal use within the package, and you should not use the variable in other code.
</div>
<hr width="25%" align="left" />
<h3><a name="ivariable$SQLClient*_name">_name</a></h3>
@protected NSString* <b>_name</b>;<br />
<div class="desc">
Unique identifier for instance <br />
<em>Warning</em> the underscore at the start of the
name of this instance variable indicates that, even
though it is not technically <em>private</em>, it is
intended for internal use within the package, and
you should not use the variable in other code.
</div>
<hr width="25%" align="left" />
<h3><a name="ivariable$SQLClient*_names">_names</a></h3>
@protected NSCountedSet* <b>_names</b>;<br />
<div class="desc">
Track notification names <br /> <em>Warning</em> the
underscore at the start of the name of this
instance variable indicates that, even though it
is not technically <em>private</em>, it is intended for
internal use within the package, and you should
not use the variable in other code.
</div>
<hr width="25%" align="left" />
<h3><a name="ivariable$SQLClient*_observers">_observers</a></h3>
@protected NSMapTable* <b>_observers</b>;<br />
<div class="desc">
Observations of async events <br />
<em>Warning</em> the underscore at the start of the
name of this instance variable indicates that, even
though it is not technically <em>private</em>, it is
intended for internal use within the package, and
you should not use the variable in other code.
</div>
<hr width="25%" align="left" />
<h3><a name="ivariable$SQLClient*_password">_password</a></h3>
@protected NSString* <b>_password</b>;<br />
<div class="desc">
The configured password <br /> <em>Warning</em> the
underscore at the start of the name of this
instance variable indicates that, even though it
is not technically <em>private</em>, it is intended for
internal use within the package, and you should
not use the variable in other code.
</div>
<hr width="25%" align="left" />
<h3><a name="ivariable$SQLClient*_shouldTrim">_shouldTrim</a></h3>
@protected BOOL <b>_shouldTrim</b>;<br />
<div class="desc">
A flag indicating whether leading and trailing white
space in values read from the database should
automatically be removed. <br /> This should
only be modified by the
<a rel="gsdoc" href="#method$SQLClient-setShouldTrim$">
-setShouldTrim:
</a>
method. <br /> Should whitespace be trimmed? <br />
<em>Warning</em> the underscore at the start of the
name of this instance variable indicates that, even
though it is not technically <em>private</em>, it is
intended for internal use within the package, and
you should not use the variable in other code.
</div>
<hr width="25%" align="left" />
<h3><a name="ivariable$SQLClient*_statements">_statements</a></h3>
@protected NSMutableArray* <b>_statements</b>;<br />
<div class="desc">
Uncommitted statements <br /> <em>Warning</em>
the underscore at the start of the name of this
instance variable indicates that, even though it
is not technically <em>private</em>, it is intended for
internal use within the package, and you should
not use the variable in other code.
</div>
<hr width="25%" align="left" />
<h3><a name="ivariable$SQLClient*_user">_user</a></h3>
@protected NSString* <b>_user</b>;<br />
<div class="desc">
The configured user <br /> <em>Warning</em> the
underscore at the start of the name of this
instance variable indicates that, even though it
is not technically <em>private</em>, it is intended for
internal use within the package, and you should
not use the variable in other code.
</div>
<hr width="25%" align="left" />
<h3><a name="ivariable$SQLClient*connected">connected</a></h3>
@protected BOOL <b>connected</b>;<br />
<div class="desc">
A flag indicating whether this instance is currently
connected to the backend database server. This
variable must <em>only</em> be set by the
<a rel="gsdoc" href="#method$SQLClient(Subclass)-backendConnect">
-backendConnect
</a>
or
<a rel="gsdoc" href="#method$SQLClient(Subclass)-backendDisconnect">
-backendDisconnect
</a>
methods.
</div>
<hr width="25%" align="left" />
<h3><a name="ivariable$SQLClient*extra">extra</a></h3>
@protected void* <b>extra</b>;<br />
<div class="desc">
For subclass specific data
</div>
<hr width="25%" align="left" />
<h3><a name="ivariable$SQLClient*lock">lock</a></h3>
@protected NSRecursiveLock* <b>lock</b>;<br />
<div class="desc">
Maintain thread-safety
</div>
<hr width="25%" align="left" />
<br/><hr width="50%" align="left" /><br/>
<h1><a name="003000000000">
Software documentation for the SQLDictionaryBuilder
class
</a></h1>
<h2><a name="class$SQLDictionaryBuilder">SQLDictionaryBuilder</a> : NSObject</h2>
<blockquote class="declared">
<dl>
<dt><b>Declared in:</b></dt>
<dd>SQLClient.h</dd>
</dl>
</blockquote>
<div class="desc">
<em>Description forthcoming.</em>
</div>
<hr width="50%" align="left" />
<a href="#_SQLDictionaryBuilder_ivars">Instance Variables</a>
<br/><br/>
<b>Method summary</b>
<ul>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLDictionaryBuilder-addObject$">-addObject:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLDictionaryBuilder-alloc">-alloc</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLDictionaryBuilder-content">-content</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLDictionaryBuilder-initWithCapacity$">-initWithCapacity:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLDictionaryBuilder-mutableCopyWithZone$">-mutableCopyWithZone:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLDictionaryBuilder-newWithValues$keys$count$">-newWithValues:keys:count:</a></li>
</ul>
<hr width="50%" align="left" />
<div class="method">
<h3><a name="method$SQLDictionaryBuilder-addObject$">addObject: </a></h3>
- (void) <b>addObject:</b> (id)anObject;<br />
<div class="desc">
No need to do anything... the object will already have
been added by the
<a rel="gsdoc" href="#method$SQLDictionaryBuilder-newWithValues$keys$count$">
-newWithValues:keys:count:
</a>
method.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLDictionaryBuilder-alloc">alloc </a></h3>
- (id) <b>alloc</b>;<br />
<div class="desc">
When a container is supposed to be allocated, we just
return the receiver (which will then quietly ignore
<a rel="gsdoc" href="#method$SQLDictionaryBuilder-addObject$">
-addObject:
</a>
messages).
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLDictionaryBuilder-content">content </a></h3>
- (NSMutableDictionary*) <b>content</b>;<br />
<div class="desc">
Returns the content dictionary for the receiver.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLDictionaryBuilder-initWithCapacity$">initWithCapacity: </a></h3>
- (id) <b>initWithCapacity:</b> (<a rel="gsdoc" href="/usr/share/GNUstep/Documentation/Performance/GSLinkedList.html#type$NSUInteger">NSUInteger</a>)capacity;<br />
<div class="desc">
Creates a new content dictionary... this method
will be called automatically by the SQLClient object
when it performs a query, so there is no need to call
it at any other time.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLDictionaryBuilder-mutableCopyWithZone$">mutableCopyWithZone: </a></h3>
- (id) <b>mutableCopyWithZone:</b> (NSZone*)aZone;<br />
<div class="desc">
Makes a mutable copy of the content dictionary
(called when a caching query uses this helper to
produce the cached collection).
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLDictionaryBuilder-newWithValues$keys$count$">newWithValues: keys: count: </a></h3>
- (id) <b>newWithValues:</b> (id*)values<b> keys:</b> (NSString**)keys<b> count:</b> (unsigned int)count;<br />
<div class="desc">
This is the main workhorse of the class... it is
called once for every record read from the database,
and is responsible for adding that record to the
content dictionary. The default implementation,
instead of creating an object to hold the supplied
record data, uses the two fields from the record as
a key-value pair to add to the content dictionary, and
returns <code>nil</code> as the record object. It's
OK to return a <code>nil</code> object since we ignore
the
<a rel="gsdoc" href="#method$SQLDictionaryBuilder-addObject$">
-addObject:
</a>
argument.
</div>
<hr width="25%" align="left" />
</div>
<a name="_SQLDictionaryBuilder_ivars"/> <br/><hr width="50%" align="left" />
<h2>Instance Variables for SQLDictionaryBuilder Class</h2>
<h3><a name="ivariable$SQLDictionaryBuilder*content">content</a></h3>
@protected NSMutableDictionary* <b>content</b>;<br />
<div class="desc">
<em>Description forthcoming.</em>
</div>
<hr width="25%" align="left" />
<br/><hr width="50%" align="left" /><br/>
<h1><a name="004000000000">
Software documentation for the SQLRecord class
</a></h1>
<h2><a name="class$SQLRecord">SQLRecord</a> : NSArray</h2>
<blockquote class="declared">
<dl>
<dt><b>Declared in:</b></dt>
<dd>SQLClient.h</dd>
</dl>
</blockquote>
<div class="desc">
</p>
<p>
An enhanced array to represent a record returned from a
query. You should <em>NOT</em> try to create
instances of this class except via the
<a rel="gsdoc" href="#method$SQLRecord+newWithValues$keys$count$">
+newWithValues:keys:count:
</a>
method.
</p>
<p>
</p>
<p>
SQLRecord is the abstract base class of a class
cluster. If you wish to subclass it you must
implement the primitive methods
<a rel="gsdoc" href="#method$SQLRecord+newWithValues$keys$count$">
+newWithValues:keys:count:
</a>
<a rel="gsdoc" href="#method$SQLRecord-count">
-count
</a>
<a rel="gsdoc" href="#method$SQLRecord-keyAtIndex$">
-keyAtIndex:
</a>
<a rel="gsdoc" href="#method$SQLRecord-objectAtIndex$">
-objectAtIndex:
</a>
and
<a rel="gsdoc" href="#method$SQLRecord-replaceObjectAtIndex$withObject$">
-replaceObjectAtIndex:withObject:
</a>
</p>
<p>
</p>
<p>
NB. You do not need to use SQLRecord (or a subclass of
it), all you actually need to supply is a class which
responds to the
<a rel="gsdoc" href="#method$SQLRecord+newWithValues$keys$count$">
+newWithValues:keys:count:
</a>
method that the system uses to create new records...
none of the other methods of the SQLRecord class are
used internally by the SQLClient system.
</p>
<p>
</div>
<b>Method summary</b>
<ul>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLRecord+newWithValues$keys$count$">+newWithValues:keys:count:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLRecord-allKeys">-allKeys</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLRecord-count">-count</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLRecord-dictionary">-dictionary</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLRecord-getKeys$">-getKeys:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLRecord-getObjects$">-getObjects:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLRecord-keyAtIndex$">-keyAtIndex:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLRecord-objectAtIndex$">-objectAtIndex:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLRecord-objectForKey$">-objectForKey:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLRecord-replaceObjectAtIndex$withObject$">-replaceObjectAtIndex:withObject:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLRecord-setObject$forKey$">-setObject:forKey:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLRecord-sizeInBytes$">-sizeInBytes:</a></li>
</ul>
<hr width="50%" align="left" />
<div class="method">
<h3><a name="method$SQLRecord+newWithValues$keys$count$">newWithValues: keys: count: </a></h3>
+ (id) <b>newWithValues:</b> (id*)v<b> keys:</b> (NSString**)k<b> count:</b> (unsigned int)c;<br />
<div class="desc">
Create a new SQLRecord containing the specified
fields. <br /> NB. The values and keys are
<em>retained</em> by the record rather than being
copied. <br /> A <code>nil</code> value is
represented by [NSNull null]. <br /> Keys must
be unique string values (case insensitive comparison).
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLRecord-allKeys">allKeys </a></h3>
- (NSArray*) <b>allKeys</b>;<br />
<div class="desc">
Returns an array containing the names of all the
fields in the record.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLRecord-count">count </a></h3>
- (<a rel="gsdoc" href="/usr/share/GNUstep/Documentation/Performance/GSLinkedList.html#type$NSUInteger">NSUInteger</a>) <b>count</b>;<br />
<div class="desc">
Returns the number of items in the record. <br />
Subclasses must implement this method.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLRecord-dictionary">dictionary </a></h3>
- (NSMutableDictionary*) <b>dictionary</b>;<br />
<div class="desc">
Return the record as a mutable dictionary with the
keys as the record field names standardised to be
lowercase strings.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLRecord-getKeys$">getKeys: </a></h3>
- (void) <b>getKeys:</b> (id*)buf;<br />
<div class="desc">
Optimised mechanism for retrieving all keys in
order.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLRecord-getObjects$">getObjects: </a></h3>
- (void) <b>getObjects:</b> (id*)buf;<br />
<div class="desc">
Optimised mechanism for retrieving all objects.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLRecord-keyAtIndex$">keyAtIndex: </a></h3>
- (NSString*) <b>keyAtIndex:</b> (<a rel="gsdoc" href="/usr/share/GNUstep/Documentation/Performance/GSLinkedList.html#type$NSUInteger">NSUInteger</a>)index;<br />
Subclasses <strong>must</strong> override this method.<br />
<div class="desc">
Returns the key at the specified indes. <br />
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLRecord-objectAtIndex$">objectAtIndex: </a></h3>
- (id) <b>objectAtIndex:</b> (<a rel="gsdoc" href="/usr/share/GNUstep/Documentation/Performance/GSLinkedList.html#type$NSUInteger">NSUInteger</a>)index;<br />
Subclasses <strong>must</strong> override this method.<br />
<div class="desc">
Returns the object at the specified indes. <br />
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLRecord-objectForKey$">objectForKey: </a></h3>
- (id) <b>objectForKey:</b> (NSString*)key;<br />
<div class="desc">
Returns the value of the named field. <br /> The
field name is case insensitive.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLRecord-replaceObjectAtIndex$withObject$">replaceObjectAtIndex: withObject: </a></h3>
- (void) <b>replaceObjectAtIndex:</b> (<a rel="gsdoc" href="/usr/share/GNUstep/Documentation/Performance/GSLinkedList.html#type$NSUInteger">NSUInteger</a>)index<b> withObject:</b> (id)anObject;<br />
<div class="desc">
Replaces the value at the specified
<var>index</var>. <br /> Subclasses must implement
this method.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLRecord-setObject$forKey$">setObject: forKey: </a></h3>
- (void) <b>setObject:</b> (id)anObject<b> forKey:</b> (NSString*)aKey;<br />
<div class="desc">
Replaces the value of the named field. <br /> The
field name is case insensitive. <br /> NB. You must
be careful not to change the contents of a record which
has been cached (unless you are sure you really want
to), as you will be changing the contents of the
cache, not just a private copy.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLRecord-sizeInBytes$">sizeInBytes: </a></h3>
- (<a rel="gsdoc" href="/usr/share/GNUstep/Documentation/Performance/GSLinkedList.html#type$NSUInteger">NSUInteger</a>) <b>sizeInBytes:</b> (NSMutableSet*)exclude;<br />
<div class="desc">
Return approximate size of this record in bytes.
<br /> The <var>exclude</var> set is used to specify
objects to <var>exclude</var> from the calculation
(to prevent recursion etc).
</div>
<hr width="25%" align="left" />
</div>
<h1><a name="005000000000">
Software documentation for the SQLSetBuilder class
</a></h1>
<h2><a name="class$SQLSetBuilder">SQLSetBuilder</a> : NSObject</h2>
<blockquote class="declared">
<dl>
<dt><b>Declared in:</b></dt>
<dd>SQLClient.h</dd>
</dl>
</blockquote>
<div class="desc">
<em>Description forthcoming.</em>
</div>
<hr width="50%" align="left" />
<a href="#_SQLSetBuilder_ivars">Instance Variables</a>
<br/><br/>
<b>Method summary</b>
<ul>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLSetBuilder-addObject$">-addObject:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLSetBuilder-added">-added</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLSetBuilder-alloc">-alloc</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLSetBuilder-content">-content</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLSetBuilder-initWithCapacity$">-initWithCapacity:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLSetBuilder-mutableCopyWithZone$">-mutableCopyWithZone:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLSetBuilder-newWithValues$keys$count$">-newWithValues:keys:count:</a></li>
</ul>
<hr width="50%" align="left" />
<div class="method">
<h3><a name="method$SQLSetBuilder-addObject$">addObject: </a></h3>
- (void) <b>addObject:</b> (id)anObject;<br />
<div class="desc">
No need to do anything... the object will already have
been added by the
<a rel="gsdoc" href="#method$SQLSetBuilder-newWithValues$keys$count$">
-newWithValues:keys:count:
</a>
method.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLSetBuilder-added">added </a></h3>
- (<a rel="gsdoc" href="/usr/share/GNUstep/Documentation/Performance/GSLinkedList.html#type$NSUInteger">NSUInteger</a>) <b>added</b>;<br />
<div class="desc">
Returns the number of objects actually added to the
counted set.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLSetBuilder-alloc">alloc </a></h3>
- (id) <b>alloc</b>;<br />
<div class="desc">
When a container is supposed to be allocated, we just
return the receiver (which will then quietly ignore
<a rel="gsdoc" href="#method$SQLSetBuilder-addObject$">
-addObject:
</a>
messages).
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLSetBuilder-content">content </a></h3>
- (NSCountedSet*) <b>content</b>;<br />
<div class="desc">
Returns the counted set for the receiver.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLSetBuilder-initWithCapacity$">initWithCapacity: </a></h3>
- (id) <b>initWithCapacity:</b> (<a rel="gsdoc" href="/usr/share/GNUstep/Documentation/Performance/GSLinkedList.html#type$NSUInteger">NSUInteger</a>)capacity;<br />
<div class="desc">
Creates a new content set... this method will be
called automatically by the SQLClient object when it
performs a query, so there is no need to call it
at any other time.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLSetBuilder-mutableCopyWithZone$">mutableCopyWithZone: </a></h3>
- (id) <b>mutableCopyWithZone:</b> (NSZone*)aZone;<br />
<div class="desc">
Makes a mutable copy of the content dictionary
(called when a caching query uses this helper to
produce the cached collection).
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLSetBuilder-newWithValues$keys$count$">newWithValues: keys: count: </a></h3>
- (id) <b>newWithValues:</b> (id*)values<b> keys:</b> (NSString**)keys<b> count:</b> (unsigned int)count;<br />
<div class="desc">
This is the main workhorse of the class... it is
called once for every record read from the database,
and is responsible for adding that record to the
content set. The default implementation, instead of
creating an object to hold the supplied record
data, uses the singe field from the record to add to
the content set, and returns <code>nil</code> as the
record object. It's OK to return a <code>nil</code>
object since we ignore the
<a rel="gsdoc" href="#method$SQLSetBuilder-addObject$">
-addObject:
</a>
argument.
</div>
<hr width="25%" align="left" />
</div>
<a name="_SQLSetBuilder_ivars"/> <br/><hr width="50%" align="left" />
<h2>Instance Variables for SQLSetBuilder Class</h2>
<h3><a name="ivariable$SQLSetBuilder*added">added</a></h3>
@protected NSUInteger <b>added</b>;<br />
<div class="desc">
<em>Description forthcoming.</em>
</div>
<hr width="25%" align="left" />
<h3><a name="ivariable$SQLSetBuilder*content">content</a></h3>
@protected NSCountedSet* <b>content</b>;<br />
<div class="desc">
<em>Description forthcoming.</em>
</div>
<hr width="25%" align="left" />
<br/><hr width="50%" align="left" /><br/>
<h1><a name="006000000000">
Software documentation for the SQLSingletonBuilder
class
</a></h1>
<h2><a name="class$SQLSingletonBuilder">SQLSingletonBuilder</a> : NSObject</h2>
<blockquote class="declared">
<dl>
<dt><b>Declared in:</b></dt>
<dd>SQLClient.h</dd>
</dl>
</blockquote>
<div class="desc">
<em>Description forthcoming.</em>
</div>
<b>Method summary</b>
<ul>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLSingletonBuilder-newWithValues$keys$count$">-newWithValues:keys:count:</a></li>
</ul>
<hr width="50%" align="left" />
<div class="method">
<h3><a name="method$SQLSingletonBuilder-newWithValues$keys$count$">newWithValues: keys: count: </a></h3>
- (id) <b>newWithValues:</b> (id*)values<b> keys:</b> (NSString**)keys<b> count:</b> (unsigned int)count;<br />
<div class="desc">
<em>Description forthcoming.</em>
</div>
<hr width="25%" align="left" />
</div>
<h1><a name="007000000000">
Software documentation for the SQLTransaction class
</a></h1>
<h2><a name="class$SQLTransaction">SQLTransaction</a> : NSObject</h2>
<blockquote class="declared">
<dl>
<dt><b>Declared in:</b></dt>
<dd>SQLClient.h</dd>
</dl>
</blockquote>
<blockquote>
<dl>
<dt><b>Conforms to:</b></dt>
<dd>NSCopying</dd>
</dl>
</blockquote>
<div class="desc">
The SQLTransaction transaction class provides a
convenient mechanism for grouping together a
series of SQL statements to be executed as a single
transaction. It avoids the need for handling
begin/commit, and should be as efficient as
reasonably possible. <br /> You obtain an instance
by calling
[SQLClient -transaction]
, add SQL statements to it using the
<a rel="gsdoc" href="#method$SQLTransaction-add$,...">
-add:,...
</a>
and/or
<a rel="gsdoc" href="#method$SQLTransaction-add$with$">
-add:with:
</a>
methods, and then use the
<a rel="gsdoc" href="#method$SQLTransaction-execute">
-execute
</a>
method to perform all the statements as a single
operation. <br /> Any exception is caught and
re-raised in the
<a rel="gsdoc" href="#method$SQLTransaction-execute">
-execute
</a>
method after any tidying up to leave the database in a
consistent state. <br /> NB. This class is not in
itsself thread-safe, though the underlying database
operations should be. If you have multiple
threads, you should create multiple SQLTransaction
instances, at least one per thread.
</div>
<hr width="50%" align="left" />
<a href="#_SQLTransaction_ivars">Instance Variables</a>
<br/><br/>
<b>Method summary</b>
<ul>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLTransaction-add$,...">-add:,...</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLTransaction-add$with$">-add:with:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLTransaction-append$">-append:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLTransaction-copyWithZone$">-copyWithZone:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLTransaction-count">-count</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLTransaction-db">-db</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLTransaction-execute">-execute</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLTransaction-executeBatch">-executeBatch</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLTransaction-executeBatchReturningFailures$logExceptions$">-executeBatchReturningFailures:logExceptions:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLTransaction-insertTransaction$atIndex$">-insertTransaction:atIndex:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLTransaction-removeTransactionAtIndex$">-removeTransactionAtIndex:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLTransaction-reset">-reset</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLTransaction-totalCount">-totalCount</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLTransaction-transactionAtIndex$">-transactionAtIndex:</a></li>
</ul>
<hr width="50%" align="left" />
<div class="method">
<h3><a name="method$SQLTransaction-add$,...">add: ,...</a></h3>
- (void) <b>add:</b> (NSString*)stmt<b>,...</b>;<br />
<div class="desc">
Adds an SQL statement to the transaction. This is
similar to
<a rel="gsdoc" href="#method$SQLClient-execute$,...">
[SQLClient -execute:,...]
</a>
but does not cause any database operation until
<a rel="gsdoc" href="#method$SQLTransaction-execute">
-execute
</a>
is called, so it will not raise a database exception.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLTransaction-add$with$">add: with: </a></h3>
- (void) <b>add:</b> (NSString*)stmt<b> with:</b> (NSDictionary*)values;<br />
<div class="desc">
Adds an SQL statement to the transaction. This is
similar to
<a rel="gsdoc" href="#method$SQLClient-execute$with$">
[SQLClient -execute:with:]
</a>
but does not cause any database operation until
<a rel="gsdoc" href="#method$SQLTransaction-execute">
-execute
</a>
is called, so it will not raise a database exception.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLTransaction-append$">append: </a></h3>
- (void) <b>append:</b> (<a rel="gsdoc" href="#class$SQLTransaction">SQLTransaction</a>*)other;<br />
<div class="desc">
Appends a copy of the <var>other</var> transaction
to the receiver. <br /> This provides a convenient way
of merging transactions which have been built by
different code modules, in order to have them all
executed together in a single operation (for
efficiency etc). <br /> This does not alter the
<var>other</var> transaction, so if the execution of
a group of merged transactions fails, it is then possible
to attempt to commit the individual transactions
separately. <br /> NB. All transactions
appended must be using the same database
connection (SQLClient instance).
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLTransaction-copyWithZone$">copyWithZone: </a></h3>
- (id) <b>copyWithZone:</b> (NSZone*)z;<br />
<div class="desc">
Make a copy of the receiver.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLTransaction-count">count </a></h3>
- (<a rel="gsdoc" href="/usr/share/GNUstep/Documentation/Performance/GSLinkedList.html#type$NSUInteger">NSUInteger</a>) <b>count</b>;<br />
<div class="desc">
Returns the number of individual statements ond/r
subsidiary transactions which have been added to
the receiver. For a count of the total number of
statements, use the
<a rel="gsdoc" href="#method$SQLTransaction-totalCount">
-totalCount
</a>
method.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLTransaction-db">db </a></h3>
- (<a rel="gsdoc" href="#class$SQLClient">SQLClient</a>*) <b>db</b>;<br />
<div class="desc">
Returns the database client with which this
instance operates. <br /> This client is retained
by the transaction.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLTransaction-execute">execute </a></h3>
- (void) <b>execute</b>;<br />
<div class="desc">
</p>
<p>
Performs any statements added to the transaction
as a single operation. If any problem occurs, an
NSException is raised, but the database
connection is left in a consistent state and a
partially completed operation is rolled back.
</p>
<p>
</p>
<p>
NB. If the database is not already in a transaction,
this implicitly calls the
<a rel="gsdoc" href="#method$SQLClient-begin">
-begin
</a>
method to start the transaction before executing
the statements. <br /> The method always commits the
transaction, even if the transaction was
begun earlier rather than in
<a rel="gsdoc" href="#method$SQLTransaction-execute">
-execute
</a>
. <br /> This behavior allows you to call
<a rel="gsdoc" href="#method$SQLClient-begin">
[SQLClient -begin]
</a>
, then run one or more queries, build up a transaction
based upon the query results, and then
<a rel="gsdoc" href="#method$SQLTransaction-execute">
-execute
</a>
that transaction, causing the entire process to be
commited as a single transaction.
</p>
<p>
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLTransaction-executeBatch">executeBatch </a></h3>
- (unsigned) <b>executeBatch</b>;<br />
<div class="desc">
Convenience method which calls
<a rel="gsdoc" href="#method$SQLTransaction-executeBatchReturningFailures$logExceptions$">-executeBatchReturningFailures:logExceptions:</a>
with a <code>nil</code> failures argument and exception logging off.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLTransaction-executeBatchReturningFailures$logExceptions$">executeBatchReturningFailures: logExceptions: </a></h3>
- (unsigned) <b>executeBatchReturningFailures:</b> (<a rel="gsdoc" href="#class$SQLTransaction">SQLTransaction</a>*)failures<b> logExceptions:</b> (BOOL)log;<br />
<div class="desc">
</p>
<p>
This is similar to the
<a rel="gsdoc" href="#method$SQLTransaction-execute">
-execute
</a>
method, but may allow partial execution of the
transaction if appropriate:
</p>
<p>
</p>
<p>
If the transaction was created using the
[SQLClient -batch:]
method and the transaction as a whole fails,
individual statements are retried. <br /> The
stopOnFailure flag for the batch creation
indicates whether the retries are stopped at
the first statement to fail, or continue (skipping
any failed statements).
</p>
<p>
</p>
<p>
If the transaction has had transactions appended to
it, those subsidiary transactions may succeed or fail
atomically depending on their individual
attributes.
</p>
<p>
</p>
<p>
If the transaction was not created using
[SQLClient -batch:]
, then calling this method is equivalent to calling the
<a rel="gsdoc" href="#method$SQLTransaction-execute">
-execute
</a>
method.
</p>
<p>
</p>
<p>
If any statements/transactions in the batch fail, they
are added to the transaction supplied in the
<var>failures</var> parameter (if it's not
<code>nil</code>) so that you can retry them
later. <br /> NB. statements/transactions which
are not executed at all (because the batch is set to
stop on the first failure) are <em>also</em> added
to the <var>failures</var> transaction.
</p>
<p>
</p>
<p>
If the <var>log</var> argument is <code>YES</code>,
then any exceptions encountered when executing the
batch are logged using the
[SQLClient -debug:,...]
method, even if debug logging is not enabled with
[SQLClient -setDebugging:]
.
</p>
<p>
The method returns the number of statements which
actually succeeded.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLTransaction-insertTransaction$atIndex$">insertTransaction: atIndex: </a></h3>
- (void) <b>insertTransaction:</b> (<a rel="gsdoc" href="#class$SQLTransaction">SQLTransaction</a>*)trn<b> atIndex:</b> (unsigned)index;<br />
<div class="desc">
Insert <var>trn</var> at the index'th position in
the receiver. <br /> The transaction <var>trn</var>
must be non-empty and must use the same database
client as the receiver.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLTransaction-removeTransactionAtIndex$">removeTransactionAtIndex: </a></h3>
- (void) <b>removeTransactionAtIndex:</b> (unsigned)index;<br />
<div class="desc">
Remove the index'th transaction or statement from
the receiver.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLTransaction-reset">reset </a></h3>
- (void) <b>reset</b>;<br />
<div class="desc">
Resets the transaction, removing all previously
added statements. This allows the transaction object
to be re-used for multiple transactions.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLTransaction-totalCount">totalCount </a></h3>
- (unsigned) <b>totalCount</b>;<br />
<div class="desc">
Returns the total count of statements in this
transaction including those in any subsidiary
transactions. For a count of the statements
and/or transactions directly added to the receiver,
use the <a rel="gsdoc" href="#method$SQLTransaction-count">-count</a>
method.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLTransaction-transactionAtIndex$">transactionAtIndex: </a></h3>
- (<a rel="gsdoc" href="#class$SQLTransaction">SQLTransaction</a>*) <b>transactionAtIndex:</b> (unsigned)index;<br />
<div class="desc">
Return an autoreleased copy of the index'th
transaction or statement added to the receiver.
<br /> Since the returned transaction contains a
copy of the statement/transaction in the receiver, you
can modify it without effecting the original.
</div>
<hr width="25%" align="left" />
</div>
<a name="_SQLTransaction_ivars"/> <br/><hr width="50%" align="left" />
<h2>Instance Variables for SQLTransaction Class</h2>
<h3><a name="ivariable$SQLTransaction*_batch">_batch</a></h3>
@protected BOOL <b>_batch</b>;<br />
<div class="desc">
<em>Warning</em> the underscore at the start of the
name of this instance variable indicates that, even
though it is not technically <em>private</em>, it is
intended for internal use within the package, and
you should not use the variable in other code.
</div>
<hr width="25%" align="left" />
<h3><a name="ivariable$SQLTransaction*_count">_count</a></h3>
@protected unsigned int <b>_count</b>;<br />
<div class="desc">
<em>Warning</em> the underscore at the start of the
name of this instance variable indicates that, even
though it is not technically <em>private</em>, it is
intended for internal use within the package, and
you should not use the variable in other code.
</div>
<hr width="25%" align="left" />
<h3><a name="ivariable$SQLTransaction*_db">_db</a></h3>
@protected SQLClient* <b>_db</b>;<br />
<div class="desc">
<em>Warning</em> the underscore at the start of the
name of this instance variable indicates that, even
though it is not technically <em>private</em>, it is
intended for internal use within the package, and
you should not use the variable in other code.
</div>
<hr width="25%" align="left" />
<h3><a name="ivariable$SQLTransaction*_info">_info</a></h3>
@protected NSMutableArray* <b>_info</b>;<br />
<div class="desc">
<em>Warning</em> the underscore at the start of the
name of this instance variable indicates that, even
though it is not technically <em>private</em>, it is
intended for internal use within the package, and
you should not use the variable in other code.
</div>
<hr width="25%" align="left" />
<h3><a name="ivariable$SQLTransaction*_stop">_stop</a></h3>
@protected BOOL <b>_stop</b>;<br />
<div class="desc">
<em>Warning</em> the underscore at the start of the
name of this instance variable indicates that, even
though it is not technically <em>private</em>, it is
intended for internal use within the package, and
you should not use the variable in other code.
</div>
<hr width="25%" align="left" />
<br/><hr width="50%" align="left" /><br/>
<h1><a name="008000000000">
Software documentation for the SQLClient(Caching)
category
</a></h1>
<h2><a rel="gsdoc" href="#class$SQLClient">SQLClient</a>(<a name="category$SQLClient(Caching)">Caching</a>)</h2>
<blockquote class="declared">
<dl>
<dt><b>Declared in:</b></dt>
<dd>SQLClient.h</dd>
</dl>
</blockquote>
<div class="desc">
This category provides methods for caching the results
of queries in order to reduce the number of client-server
trips and the database load produced by an application
which needs update its information from the database
frequently.
</div>
<b>Method summary</b>
<ul>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Caching)-cache">-cache</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Caching)-cache$query$,...">-cache:query:,...</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Caching)-cache$query$with$">-cache:query:with:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Caching)-cache$simpleQuery$">-cache:simpleQuery:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Caching)-cache$simpleQuery$recordType$listType$">-cache:simpleQuery:recordType:listType:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Caching)-setCache$">-setCache:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Caching)-setCacheThread$">-setCacheThread:</a></li>
</ul>
<hr width="50%" align="left" />
<div class="method">
<h3><a name="method$SQLClient(Caching)-cache">cache </a></h3>
- (<a rel="gsdoc" href="/usr/share/GNUstep/Documentation/Performance/GSCache.html#class$GSCache">GSCache</a>*) <b>cache</b>;<br />
<div class="desc">
Returns the cache used by the receiver for storing
the results of requests made through it. Creates a new
cache if necessary.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient(Caching)-cache$query$,...">cache: query: ,...</a></h3>
- (NSMutableArray*) <b>cache:</b> (int)seconds<b> query:</b> (NSString*)stmt<b>,...</b>;<br />
<div class="desc">
Calls
<a rel="gsdoc" href="#method$SQLClient(Caching)-cache$simpleQuery$recordType$listType$">-cache:simpleQuery:recordType:listType:</a>
with the default record class, array class, and with a query string formed from <var>stmt</var> and the following values (if any).
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient(Caching)-cache$query$with$">cache: query: with: </a></h3>
- (NSMutableArray*) <b>cache:</b> (int)seconds<b> query:</b> (NSString*)stmt<b> with:</b> (NSDictionary*)values;<br />
<div class="desc">
Calls
<a rel="gsdoc" href="#method$SQLClient(Caching)-cache$simpleQuery$recordType$listType$">-cache:simpleQuery:recordType:listType:</a>
with the default record class array class and with a query string formed from <var>stmt</var> and <var>values</var>.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient(Caching)-cache$simpleQuery$">cache: simpleQuery: </a></h3>
- (NSMutableArray*) <b>cache:</b> (int)seconds<b> simpleQuery:</b> (NSString*)stmt;<br />
<div class="desc">
Calls
<a rel="gsdoc" href="#method$SQLClient(Caching)-cache$simpleQuery$recordType$listType$">-cache:simpleQuery:recordType:listType:</a>
with the default record class and array class.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient(Caching)-cache$simpleQuery$recordType$listType$">cache: simpleQuery: recordType: listType: </a></h3>
- (NSMutableArray*) <b>cache:</b> (int)seconds<b> simpleQuery:</b> (NSString*)stmt<b> recordType:</b> (id)rtype<b> listType:</b> (id)ltype;<br />
<div class="desc">
If the result of the query is already cached and has not
expired, return it. Otherwise, perform the query
and cache the result giving it the specified lifetime
in <var>seconds</var>. <br /> If <var>seconds</var> is
negative, the query is performed irrespective of
whether it is already cached, and its absolute
value is used to set the lifetime of the results.
<br /> If <var>seconds</var> is zero, the cache for
this query is emptied. <br /> Handles locking. <br />
Maintains
<a rel="gsdoc" href="#method$SQLClient-lastOperation">
-lastOperation
</a>
date. <br /> The value of <var>rtype</var> must
respond to the
<a rel="gsdoc" href="#method$SQLRecord+newWithValues$keys$count$">[SQLRecord +newWithValues:keys:count:]</a>
method. <br /> If <var>rtype</var> is <code>nil</code> then the
<a rel="gsdoc" href="#class$SQLRecord">SQLRecord</a>
class is used. <br /> The value of <var>ltype</var>
must respond to the
[NSObject +alloc]
method to produce a container which must repond to
the
[NSMutableArray -initWithCapacity:]
method to initialise itsself and the [NSMutableArray -addObject:]
method to add records to the list. <br /> If <var>ltype</var> is <code>nil</code> then the
NSMutableArray
class is used. <br /> The list produced by this
argument is used as the return value of this
method. <br /> If a cache thread has been set
using the
<a rel="gsdoc" href="#method$SQLClient(Caching)-setCacheThread$">
-setCacheThread:
</a>
method, and the
<a rel="gsdoc" href="#method$SQLClient(Caching)-cache$simpleQuery$recordType$listType$">-cache:simpleQuery:recordType:listType:</a>
method is called from a thread other than the cache thread, then any query to retrieve uncached data will be performed in the cache thread, and for cached (but expired) data, the old (expired) results may be returned... in which case an asynchronous query to update the cache will be executed as soon as possible in the cache thread.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient(Caching)-setCache$">setCache: </a></h3>
- (void) <b>setCache:</b> (<a rel="gsdoc" href="/usr/share/GNUstep/Documentation/Performance/GSCache.html#class$GSCache">GSCache</a>*)aCache;<br />
<div class="desc">
Sets the cache to be used by the receiver for storing
the results of requests made through it. <br /> If
<var>aCache</var> is <code>nil</code>, the current
cache is released, and a new cache will be
automatically created as soon as there is a
need to cache anything.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient(Caching)-setCacheThread$">setCacheThread: </a></h3>
- (void) <b>setCacheThread:</b> (NSThread*)aThread;<br />
<div class="desc">
Sets the thread to be used to retrieve data to
populate the cache. <br /> All cached queries will
be performed in this thread (if non-nil). <br /> The
setting of a thread for the cache also implies that
expired items in the cache may not be removed when
they are queried from another thread, rather they can
be kept (if they are not <em>too</em> old) and an
asynchronous query to update them will be run
on the cache thread. <br /> The rule is that, if the
item's age is more than twice its nominal lifetime,
it will be retrieved immediately, otherwise it will be
retrieved asynchrnonously. <br /> Currently this
may only be the main thread or <code>nil</code>. Any
attempt to set another thread will use the main
thread instead.
</div>
<hr width="25%" align="left" />
</div>
<h1><a name="009000000000">
Software documentation for the SQLClient(Convenience)
category
</a></h1>
<h2><a rel="gsdoc" href="#class$SQLClient">SQLClient</a>(<a name="category$SQLClient(Convenience)">Convenience</a>)</h2>
<blockquote class="declared">
<dl>
<dt><b>Declared in:</b></dt>
<dd>SQLClient.h</dd>
</dl>
</blockquote>
<div class="desc">
This category contains convenience methods including
those for frequently performed database operations...
message logging etc.
</div>
<b>Method summary</b>
<ul>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Convenience)-batch$">-batch:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Convenience)-columns$">-columns:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Convenience)-queryRecord$,...">-queryRecord:,...</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Convenience)-queryString$,...">-queryString:,...</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Convenience)-singletons$">-singletons:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Convenience)-transaction">-transaction</a></li>
</ul>
<hr width="50%" align="left" />
<div class="method">
<h3><a name="method$SQLClient(Convenience)-batch$">batch: </a></h3>
- (<a rel="gsdoc" href="#class$SQLTransaction">SQLTransaction</a>*) <b>batch:</b> (BOOL)stopOnFailure;<br />
<div class="desc">
Returns a transaction object configured to handle
batching and execute part of a batch of statements
if execution of the whole using the
<a rel="gsdoc" href="#method$SQLTransaction-executeBatch">[SQLTransaction -executeBatch]</a>
method fails. <br /> If <var>stopOnFailure</var> is <code>YES</code> than execution of the transaction will stop with the first statement to fail, otherwise it will execute all the statements it can, skipping any failed statements.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient(Convenience)-columns$">columns: </a></h3>
- (NSMutableArray*) <b>columns:</b> (NSMutableArray*)records;<br />
<div class="desc">
Convenience method to deal with the results of
a query converting the normal array of <var>records</var>
into an array of record columns. Each column in the
array is an array containing all the values from that
column.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient(Convenience)-queryRecord$,...">queryRecord: ,...</a></h3>
- (<a rel="gsdoc" href="#class$SQLRecord">SQLRecord</a>*) <b>queryRecord:</b> (NSString*)stmt<b>,...</b>;<br />
<div class="desc">
Executes a query (like the
<a rel="gsdoc" href="#method$SQLClient-query$,...">
-query:,...
</a>
method) and checks the result (raising an exception
if the query did not contain a single record) and
returns the resulting record.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient(Convenience)-queryString$,...">queryString: ,...</a></h3>
- (NSString*) <b>queryString:</b> (NSString*)stmt<b>,...</b>;<br />
<div class="desc">
Executes a query (like the
<a rel="gsdoc" href="#method$SQLClient-query$,...">
-query:,...
</a>
method) and checks the result. <br /> Raises an
exception if the query did not contain a single
record, or if the record did not contain a single
field. <br /> Returns the resulting field as a
<em>string</em>.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient(Convenience)-singletons$">singletons: </a></h3>
- (void) <b>singletons:</b> (NSMutableArray*)records;<br />
<div class="desc">
Convenience method to deal with the results of
a query where each record contains a single field... it
converts the array of <var>records</var> returned
by the query to an array containing the fields. <br />
NB. This does not check that the contents of the
<var>records</var> array are actually instances of
<a rel="gsdoc" href="#class$SQLRecord">SQLRecord</a>
, so you must ensure you don't call it more than once
on the same array (something that may happen if you
retrieve the array using a cache based query).
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient(Convenience)-transaction">transaction </a></h3>
- (<a rel="gsdoc" href="#class$SQLTransaction">SQLTransaction</a>*) <b>transaction</b>;<br />
<div class="desc">
Creates and returns an autoreleased SQLTransaction
instance which will use the receiver as the
database connection to perform transactions.
</div>
<hr width="25%" align="left" />
</div>
<h1><a name="010000000000">
Software documentation for the SQLClient(Logging)
category
</a></h1>
<h2><a rel="gsdoc" href="#class$SQLClient">SQLClient</a>(<a name="category$SQLClient(Logging)">Logging</a>)</h2>
<blockquote class="declared">
<dl>
<dt><b>Declared in:</b></dt>
<dd>SQLClient.h</dd>
</dl>
</blockquote>
<div class="desc">
This category porovides basic methods for logging debug
information.
</div>
<b>Method summary</b>
<ul>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Logging)+debugging">+debugging</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Logging)+durationLogging">+durationLogging</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Logging)+setDebugging$">+setDebugging:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Logging)+setDurationLogging$">+setDurationLogging:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Logging)-debug$,...">-debug:,...</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Logging)-debugging">-debugging</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Logging)-durationLogging">-durationLogging</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Logging)-setDebugging$">-setDebugging:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Logging)-setDurationLogging$">-setDurationLogging:</a></li>
</ul>
<hr width="50%" align="left" />
<div class="method">
<h3><a name="method$SQLClient(Logging)+debugging">debugging </a></h3>
+ (unsigned int) <b>debugging</b>;<br />
<div class="desc">
Return the class-wide debugging level, which is
inherited by all newly created instances.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient(Logging)+durationLogging">durationLogging </a></h3>
+ (NSTimeInterval) <b>durationLogging</b>;<br />
<div class="desc">
Return the class-wide duration logging threshold,
which is inherited by all newly created instances.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient(Logging)+setDebugging$">setDebugging: </a></h3>
+ (void) <b>setDebugging:</b> (unsigned int)level;<br />
<div class="desc">
Set the debugging <var>level</var> to be inherited by
all new instances. <br /> See
<a rel="gsdoc" href="#method$SQLClient(Logging)-setDebugging$">[SQLClient(Logging) -setDebugging:]</a>
for controlling an individual instance of the class.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient(Logging)+setDurationLogging$">setDurationLogging: </a></h3>
+ (void) <b>setDurationLogging:</b> (NSTimeInterval)threshold;<br />
<div class="desc">
Set the duration logging <var>threshold</var> to be
inherited by new instances. <br /> See
<a rel="gsdoc" href="#method$SQLClient(Logging)-setDurationLogging$">[SQLClient(Logging) -setDurationLogging:]</a>
for controlling an individual instance of the class.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient(Logging)-debug$,...">debug: ,...</a></h3>
- (void) <b>debug:</b> (NSString*)fmt<b>,...</b>;<br />
<div class="desc">
The default implementation calls NSLogv to log a debug
message. <br /> Override this in a category to
provide more sophisticated logging. <br /> Do NOT
override with code which can be slow or which
calls (directly or indirectly) any SQLCLient methods,
since this method will be used inside locked regions
of the SQLClient code and you could cause deadlocks or
<strong>long</strong> delays to other threads
using the class.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient(Logging)-debugging">debugging </a></h3>
- (unsigned int) <b>debugging</b>;<br />
<div class="desc">
Return the current debugging level. <br /> A level
of zero (default) means that no debug output is
produced, except for that concerned with logging
the database transactions taking over a certain amount
of time (see the
<a rel="gsdoc" href="#method$SQLClient(Logging)-setDurationLogging$">
-setDurationLogging:
</a>
method).
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient(Logging)-durationLogging">durationLogging </a></h3>
- (NSTimeInterval) <b>durationLogging</b>;<br />
<div class="desc">
Returns the threshold above which queries and
statements taking a <strong>long</strong> time
to execute are logged. A negative value (default)
indicates that this logging is disabled. A value
of zero means that all statements are logged.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient(Logging)-setDebugging$">setDebugging: </a></h3>
- (void) <b>setDebugging:</b> (unsigned int)level;<br />
<div class="desc">
Set the debugging <var>level</var> of this instance...
overrides the default <var>level</var> inherited
from the class.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient(Logging)-setDurationLogging$">setDurationLogging: </a></h3>
- (void) <b>setDurationLogging:</b> (NSTimeInterval)threshold;<br />
<div class="desc">
Set a <var>threshold</var> above which queries and
statements taking a <strong>long</strong> time
to execute are logged. A negative value (default)
disables this logging. A value of zero logs all
statements.
</div>
<hr width="25%" align="left" />
</div>
<h1><a name="011000000000">
Software documentation for the
SQLClient(Notifications) category
</a></h1>
<h2><a rel="gsdoc" href="#class$SQLClient">SQLClient</a>(<a name="category$SQLClient(Notifications)">Notifications</a>)</h2>
<blockquote class="declared">
<dl>
<dt><b>Declared in:</b></dt>
<dd>SQLClient.h</dd>
</dl>
</blockquote>
<div class="desc">
This category contains methods for asynchronous
notification of events via the database (for
those database backends which support it: currently
only PostgreSQL).
</div>
<b>Method summary</b>
<ul>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Notifications)-addObserver$selector$name$">-addObserver:selector:name:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Notifications)-postNotificationName$payload$">-postNotificationName:payload:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Notifications)-removeObserver$name$">-removeObserver:name:</a></li>
</ul>
<hr width="50%" align="left" />
<div class="method">
<h3><a name="method$SQLClient(Notifications)-addObserver$selector$name$">addObserver: selector: name: </a></h3>
- (void) <b>addObserver:</b> (id)anObserver<b> selector:</b> (SEL)aSelector<b> name:</b> (NSString*)name;<br />
<div class="desc">
Adds <var>anObserver</var> to receive notifications
when the backend database server sends an asynchronous
event identified by the specified <var>name</var>
(which must be a valid database identifier). <br />
When a notification (NSNotification instance) is
received by the method specified by
<var>aSelector</var>, its <em>object</em> will be the
SQLClient instance to which <var>anObserver</var>
was added and its userInfo dictionary will contain the
key 'Local' and possibly the key 'Payload'. <br /> If
the 'Local' value is the boolean <code>YES</code>, the
notification originated as an action by this
SQLClient instance. <br /> If the 'Payload' value
is not <code>nil</code>, then it is a string providing
extra information about the notification. <br /> NB.
At the point when the observer is notified about an
event the database client object will be locked and
may not be used to query or modify the database
(typically a database query will already be in
progress). The method handling the notification
must therefore handle any database operations in a
later timeout.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient(Notifications)-postNotificationName$payload$">postNotificationName: payload: </a></h3>
- (void) <b>postNotificationName:</b> (NSString*)name<b> payload:</b> (NSString*)more;<br />
<div class="desc">
Posts a notification via the database. The
<var>name</var> is an SQL identifier (for which
observers may have registered) and the extra
payload information may be <code>nil</code> if not
required.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient(Notifications)-removeObserver$name$">removeObserver: name: </a></h3>
- (void) <b>removeObserver:</b> (id)anObserver<b> name:</b> (NSString*)name;<br />
<div class="desc">
Removes <var>anObserver</var> as an observer for
asynchronous notifications from the database
server. If <var>name</var> is omitted, the observer
will be removed for all names.
</div>
<hr width="25%" align="left" />
</div>
<h1><a name="012000000000">
Software documentation for the SQLClient(Subclass)
category
</a></h1>
<h2><a rel="gsdoc" href="#class$SQLClient">SQLClient</a>(<a name="category$SQLClient(Subclass)">Subclass</a>)</h2>
<blockquote class="declared">
<dl>
<dt><b>Declared in:</b></dt>
<dd>SQLClient.h</dd>
</dl>
</blockquote>
<div class="desc">
This category contains the methods which a subclass
<em>must</em> override to provide a working instance,
and helper methods for the backend implementations.
<br /> Application programmers should <em>not</em>
call the backend methods directly. <br />
</p>
<p>
When subclassing to produce a backend driver bundle,
please be aware that the subclass must <em>NOT</em>
introduce additional instance variables. Instead
the <em>extra</em> instance variable is provided for
use as a pointer to subclass specific data.
</p>
<p>
</div>
<b>Method summary</b>
<ul>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Subclass)-backendConnect">-backendConnect</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Subclass)-backendDisconnect">-backendDisconnect</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Subclass)-backendExecute$">-backendExecute:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Subclass)-backendListen$">-backendListen:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Subclass)-backendNotify$payload$">-backendNotify:payload:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Subclass)-backendQuery$">-backendQuery:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Subclass)-backendQuery$recordType$listType$">-backendQuery:recordType:listType:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Subclass)-backendUnlisten$">-backendUnlisten:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Subclass)-copyEscapedBLOB$into$">-copyEscapedBLOB:into:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Subclass)-insertBLOBs$intoStatement$length$withMarker$length$giving$">-insertBLOBs:intoStatement:length:withMarker:length:giving:</a></li>
<li><a rel="gsdoc" href="SQLClient.html#method$SQLClient(Subclass)-lengthOfEscapedBLOB$">-lengthOfEscapedBLOB:</a></li>
</ul>
<hr width="50%" align="left" />
<div class="method">
<h3><a name="method$SQLClient(Subclass)-backendConnect">backendConnect </a></h3>
- (BOOL) <b>backendConnect</b>;<br />
Subclasses <strong>must</strong> override this method.<br />
<div class="desc">
Attempts to establish a connection to the database
server. <br /> Returns a flag to indicate whether
the connection has been established. <br /> If a
connection was already established, returns
<code>YES</code> and does nothing. <br /> You should
not need to use this method normally, as it is called
for you automatically when necessary. <br />
</p>
<p>
Subclasses <strong>must</strong> implement
this method to establish a connection to the
database server process (and initialise the
<em>extra</em> instance variable if necessary),
setting the <em>connected</em> instance variable
to indicate the state of the object.
</p>
<p>
</p>
<p>
This method must call
<a rel="gsdoc" href="#method$SQLClient+purgeConnections$">
+purgeConnections:
</a>
to ensure that there is a free slot for the new
connection.
</p>
<p>
</p>
<p>
Application code must <em>not</em> call this
method directly, it is for internal use only. The
<a rel="gsdoc" href="#method$SQLClient-connect">
-connect
</a>
method calls this method if the <em>connected</em>
instance variable is <code>NO</code>.
</p>
<p>
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient(Subclass)-backendDisconnect">backendDisconnect </a></h3>
- (void) <b>backendDisconnect</b>;<br />
Subclasses <strong>must</strong> override this method.<br />
<div class="desc">
Disconnect from the database unless already
disconnected. <br />
</p>
<p>
This method is called automatically when the
receiver is deallocated or reconfigured, and may
also be called automatically when there are too many
database connections active.
</p>
<p>
</p>
<p>
If the receiver is an instance of a subclass which
uses the <em>extra</em> instance variable, it
<strong>must</strong> clear that variable in the
<a rel="gsdoc" href="#method$SQLClient(Subclass)-backendDisconnect">
-backendDisconnect
</a>
method, because a reconfiguration may cause the
class of the receiver to change.
</p>
<p>
</p>
<p>
This method must set the <em>connected</em> instance
variable to <code>NO</code>.
</p>
<p>
</p>
<p>
Application code must <em>not</em> call this
method directly, it is for internal use only. The
<a rel="gsdoc" href="#method$SQLClient-disconnect">
-disconnect
</a>
method calls this method if the <em>connected</em>
instance variable is <code>YES</code>.
</p>
<p>
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient(Subclass)-backendExecute$">backendExecute: </a></h3>
- (NSInteger) <b>backendExecute:</b> (NSArray*)info;<br />
Subclasses <strong>must</strong> override this method.<br />
<div class="desc">
Perform arbitrary operation
<em>which does not return any value.</em> <br /> This
method has a single argument, an array containing
the string representing the statement to be executed as
its first object, and an optional sequence of data
objects following it. <br />
<pre>
[db backendExecute: [NSArray arrayWithObject:
@"UPDATE MyTable SET Name = 'The name' WHERE ID = 123"]];
</pre>
</p>
<p>
The backend implementation is required to perform the
SQL statement using the supplied NSData objects at
the points in the statement marked by the
<code>'?'''?'</code> sequence. The marker
saequences are inserted into the statement at
an earlier stage by the
<a rel="gsdoc" href="#method$SQLClient-execute$,...">
-execute:,...
</a>
and
<a rel="gsdoc" href="#method$SQLClient-execute$with$">
-execute:with:
</a>
methods.
</p>
<p>
</p>
<p>
Callers should lock the instance using the
<em>lock</em> instance variable for the duration of
the operation, and unlock it afterwards.
</p>
<p>
</p>
<p>
NB. callers (other than the
<a rel="gsdoc" href="#method$SQLClient-begin">
-begin
</a>
, <a rel="gsdoc" href="#method$SQLClient-commit">-commit</a>
, and
<a rel="gsdoc" href="#method$SQLClient-rollback">
-rollback
</a>
methods) should not pass any statement to this
method which would cause a transaction to begin or
end.
</p>
<p>
</p>
<p>
Application code must <em>not</em> call this
method directly, it is for internal use only.
</p>
<p>
</p>
<p>
Where the database backend support it, this method
returns the count of the number of rows to which
the operation applied. Otherwise this returns -1.
</p>
<p>
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient(Subclass)-backendListen$">backendListen: </a></h3>
- (void) <b>backendListen:</b> (NSString*)name;<br />
Subclasses <strong>must</strong> override this method.<br />
<div class="desc">
Called to enable asynchronous notification of
database events using the specified
<var>name</var> (which must be a valid identifier
consisting of ascii letters, digits, and
underscore characters, starting with a letter).
Names are not case sensitive (so AAA is the same as
aaa). <br /> Repeated calls to list on the same
<var>name</var> should be treated as a single call.
<br /> The backend is responsible for implicitly
unlistening when a connection is closed. <br />
There is a default implementation which does nothing
... for backends which don't support asynchronous
notifications. <br /> If a backend
<em>does</em> support asynchronous notifications, it
should do so by posting NSNotification instances to
[NSNotificationCenter defaultCenter]
using the SQLClient instance as the notification
object and supplying any payload as a string using
the 'Payload' key in the NSNotification userInfo
dictionary. The userInfo dictionary should also
contain a boolean (NSNumber) value, using the
'Local' key, to indicate whether the notification
was sent by the current SQLClient instance or by some
other client/
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient(Subclass)-backendNotify$payload$">backendNotify: payload: </a></h3>
- (void) <b>backendNotify:</b> (NSString*)name<b> payload:</b> (NSString*)more;<br />
Subclasses <strong>must</strong> override this method.<br />
<div class="desc">
The backend should implement this to send asynchronous
notifications to anything listening for them.
The <var>name</var> of the notification is an SQL
identifier used for listening for the
asynchronous data. <br /> The payload string
may be <code>nil</code> if no additional information is
needed in the notification.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient(Subclass)-backendQuery$">backendQuery: </a></h3>
- (NSMutableArray*) <b>backendQuery:</b> (NSString*)stmt;<br />
<div class="desc">
Calls
<a rel="gsdoc" href="#method$SQLClient(Subclass)-backendQuery$recordType$listType$">-backendQuery:recordType:listType:</a>
with the default record class and array class.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient(Subclass)-backendQuery$recordType$listType$">backendQuery: recordType: listType: </a></h3>
- (NSMutableArray*) <b>backendQuery:</b> (NSString*)stmt<b> recordType:</b> (id)rtype<b> listType:</b> (id)ltype;<br />
Subclasses <strong>must</strong> override this method.<br />
<div class="desc">
</p>
<p>
Perform arbitrary query
<em>which returns values.</em>
</p>
<p>
<pre>
result = [db backendQuery: @"SELECT Name FROM Table"
recordType: [SQLRecord class]]
listType: [NSMutableArray class]];
</pre>
</p>
<p>
Upon error, an exception is raised.
</p>
<p>
</p>
<p>
The query returns an array of records (each of which
is represented by an SQLRecord object).
</p>
<p>
</p>
<p>
Each SQLRecord object contains one or more fields,
in the order in which they occurred in the query.
Fields may also be retrieved by name.
</p>
<p>
</p>
<p>
NULL field items are returned as NSNull objects.
</p>
<p>
</p>
<p>
Callers should lock the instance using the
<em>lock</em> instance variable for the duration of
the operation, and unlock it afterwards.
</p>
<p>
</p>
<p>
Application code must <em>not</em> call this
method directly, it is for internal use only.
</p>
<p>
</p>
<p>
The <var>rtype</var> argument specifies an object to
be used to create the records produced by the query.
<br /> This is provided as a performance
optimisation when you want to store data
directly into a special class of your own.
<br /> The object must respond to the [SQLRecord
+newWithValues:keys:count:]
method to produce a new record initialised with
the supplied data.
</p>
<p>
</p>
<p>
The <var>ltype</var> argument specifies an object to
be used to create objects to store the records
produced by the query. <br /> The should be a
subclass of NSMutableArray. It must at least
implement the
[NSObject +alloc]
method to create an instnce to store records. The
instance must implement
[NSMutableArray -initWithCapacity:]
to initialise itsself and [NSMutableArray -addObject:]
to allow the backend to add records to it. <br /> For caching to work, it must be possible to make a mutable copy of the instance using the mutableCopy method.
</p>
<p>
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient(Subclass)-backendUnlisten$">backendUnlisten: </a></h3>
- (void) <b>backendUnlisten:</b> (NSString*)name;<br />
Subclasses <strong>must</strong> override this method.<br />
<div class="desc">
Called to disable asynchronous notification of
database events using the specified
<var>name</var>. This has no effect if the
<var>name</var> has not been used in an earlier call
to
<a rel="gsdoc" href="#method$SQLClient(Subclass)-backendListen$">
-backendListen:
</a>
, or if the <var>name</var> has already been unlistened
since the last call to listen. on it. <br /> There is
a default implementation which does nothing... for
backends which don't support asynchronous
notifications.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient(Subclass)-copyEscapedBLOB$into$">copyEscapedBLOB: into: </a></h3>
- (unsigned) <b>copyEscapedBLOB:</b> (NSData*)blob<b> into:</b> (void*)buf;<br />
Subclasses <strong>must</strong> override this method.<br />
<div class="desc">
This method is <em>only</em> for the use of the
<a rel="gsdoc" href="#method$SQLClient(Subclass)-insertBLOBs$intoStatement$length$withMarker$length$giving$">-insertBLOBs:intoStatement:length:withMarker:length:giving:</a>
method. <br /> Subclasses which need to insert binary data into a statement must implement this method to copy the escaped data into place and return the number of bytes actually copied.
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient(Subclass)-insertBLOBs$intoStatement$length$withMarker$length$giving$">insertBLOBs: intoStatement: length: withMarker: length: giving: </a></h3>
- (const void*) <b>insertBLOBs:</b> (NSArray*)blobs<b> intoStatement:</b> (const void*)statement<b> length:</b> (unsigned)sLength<b> withMarker:</b> (const void*)marker<b> length:</b> (unsigned)mLength<b> giving:</b> (unsigned*)result;<br />
<div class="desc">
</p>
<p>
This method is a convenience method provided for
subclasses which need to insert escaped binary
data into an SQL <var>statement</var> before sending
the <var>statement</var> to a backend server process.
This method makes use of the
<a rel="gsdoc" href="#method$SQLClient(Subclass)-copyEscapedBLOB$into$">
-copyEscapedBLOB:into:
</a>
and
<a rel="gsdoc" href="#method$SQLClient(Subclass)-lengthOfEscapedBLOB$">
-lengthOfEscapedBLOB:
</a>
methods, which <em>must</em> be implemented by
the subclass.
</p>
<p>
</p>
<p>
The <var>blobs</var> array is an array containing the
original SQL <var>statement</var> string (unused
by this method) followed by the data items to be
inserted.
</p>
<p>
</p>
<p>
The <var>statement</var> and <var>sLength</var>
arguments specify the datastream to be copied
and into which the BLOBs are to be inserted.
</p>
<p>
</p>
<p>
The <var>marker</var> and <var>mLength</var>
arguments specify the sequence of
<var>marker</var> bytes in the <var>statement</var>
which indicate a position for insertion of an
escaped BLOB.
</p>
<p>
</p>
<p>
The method returns either the original
<var>statement</var> or a copy containing the
escaped BLOBs. The length of the returned data is
stored in <var>result</var>.
</p>
<p>
</div>
<hr width="25%" align="left" />
</div>
<div class="method">
<h3><a name="method$SQLClient(Subclass)-lengthOfEscapedBLOB$">lengthOfEscapedBLOB: </a></h3>
- (unsigned) <b>lengthOfEscapedBLOB:</b> (NSData*)blob;<br />
Subclasses <strong>must</strong> override this method.<br />
<div class="desc">
This method is <em>only</em> for the use of the
<a rel="gsdoc" href="#method$SQLClient(Subclass)-insertBLOBs$intoStatement$length$withMarker$length$giving$">-insertBLOBs:intoStatement:length:withMarker:length:giving:</a>
method. <br /> Subclasses which need to insert binary data into a statement must implement this method to return the length of the escaped bytestream which will be inserted.
</div>
<hr width="25%" align="left" />
</div>
<h1><a name="013000000000">SQLClient constants</a></h1>
<p>
</p>
<h3><a name="constant$SQLClientDidConnectNotification">SQLClientDidConnectNotification</a></h3>
NSString* const SQLClientDidConnectNotification;<br />
<div class="desc">
Notification sent when an instance becomes
connected to the database server. The notification
object is the instance connected.
</div>
<hr width="25%" align="left" />
<h3><a name="constant$SQLClientDidDisconnectNotification">SQLClientDidDisconnectNotification</a></h3>
NSString* const SQLClientDidDisconnectNotification;<br />
<div class="desc">
Notification sent when an instance becomes
disconnected from the database server. The
notification object is the instance
disconnected.
</div>
<hr width="25%" align="left" />
<h1><a name="014000000000">SQLClient variables</a></h1>
<p>
</p>
<h3><a name="variable$SQLConnectionException">SQLConnectionException</a></h3>
NSString* SQLConnectionException;<br />
<div class="desc">
Exception for when a connection to the server is
lost.
</div>
<hr width="25%" align="left" />
<h3><a name="variable$SQLEmptyException">SQLEmptyException</a></h3>
NSString* SQLEmptyException;<br />
<div class="desc">
Exception for when a query is supposed to return
data and doesn't.
</div>
<hr width="25%" align="left" />
<h3><a name="variable$SQLException">SQLException</a></h3>
NSString* SQLException;<br />
<div class="desc">
Exception raised when an error with the remote
database server occurs.
</div>
<hr width="25%" align="left" />
<h3><a name="variable$SQLUniqueException">SQLUniqueException</a></h3>
NSString* SQLUniqueException;<br />
<div class="desc">
Exception for when an insert/update would break the
uniqueness of a field or index.
</div>
<hr width="25%" align="left" />
<h1><a name="015000000000">SQLClient functions</a></h1>
<p>
</p>
<h3><a name="function$SQLClientTimeLast">SQLClientTimeLast</a></h3>
NSTimeInterval SQLClientTimeLast();<br />
<div class="desc">
Returns the timestamp of the most recent call to
<a rel="gsdoc" href="#function$SQLClientTimeNow">
SQLClientTimeNow()
</a>
.
</div>
<hr width="25%" align="left" />
<h3><a name="function$SQLClientTimeNow">SQLClientTimeNow</a></h3>
NSTimeInterval SQLClientTimeNow();<br />
<div class="desc">
Convenience function to provide timing
information quickly. <br /> This returns the
current date/time, and stores the value for use by
the
<a rel="gsdoc" href="#function$SQLClientTimeLast">
SQLClientTimeLast()
</a>
function.
</div>
<hr width="25%" align="left" />
<h3><a name="function$SQLClientTimeStart">SQLClientTimeStart</a></h3>
NSTimeInterval SQLClientTimeStart();<br />
<div class="desc">
This returns the timestamp from which any of the
SQLClient classes was first used or
<a rel="gsdoc" href="#function$SQLClientTimeNow">
SQLClientTimeNow()
</a>
was first called (whichever came first).
</div>
<hr width="25%" align="left" />
<h3><a name="function$SQLClientTimeTick">SQLClientTimeTick</a></h3>
unsigned int SQLClientTimeTick();<br />
<div class="desc">
A convenience method to return the current clock 'tick'...
which is the current second based on the time we
started. This does <em>not</em> check the current
time, but relies on
<a rel="gsdoc" href="#function$SQLClientTimeLast">
SQLClientTimeLast()
</a>
returning an up to date value (so if you need an
accurate tick, you should ensure that
<a rel="gsdoc" href="#function$SQLClientTimeNow">
SQLClientTimeNow()
</a>
is called at least once a second). <br /> The returned
value is always greater than zero, and is basically
calculated as (SQLClientTimeLast() -
<a rel="gsdoc" href="#function$SQLClientTimeStart">
SQLClientTimeStart()
</a>
+ 1). <br /> In the event that the system clock is reset
into the past, the value of
<a rel="gsdoc" href="#function$SQLClientTimeStart">
SQLClientTimeStart()
</a>
is automatically adjusted to ensure that the result of a
call to
<a rel="gsdoc" href="#function$SQLClientTimeTick">
SQLClientTimeTick()
</a>
is never less than the result of any earlier call to the
function.
</div>
<hr width="25%" align="left" />
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