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<title>HOWTO for common tasks: GNOME Data Access 5 manual</title>
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<div class="chapter">
<div class="titlepage"><div><div><h2 class="title">
<a name="howto"></a>HOWTO for common tasks</h2></div></div></div>
<div class="toc"><dl class="toc">
<dt><span class="sect1"><a href="howto.html#id-1.3.3.3">Open a connection</a></span></dt>
<dt><span class="sect1"><a href="ch12s02.html">Define a data source (DSN)</a></span></dt>
<dt><span class="sect1"><a href="howto-sqlbuilder.html">Build statements without using a parser</a></span></dt>
<dd><dl>
<dt><span class="sect2"><a href="howto-sqlbuilder.html#id-1.3.3.5.4">INSERT INTO customers (e, f, g) VALUES (##p1::string, 15, 'joe')</a></span></dt>
<dt><span class="sect2"><a href="howto-sqlbuilder.html#id-1.3.3.5.5">SELECT people.firstname AS person, people.lastname, "date" AS birthdate, age FROM people</a></span></dt>
<dt><span class="sect2"><a href="howto-sqlbuilder.html#id-1.3.3.5.6">SELECT c."date", name AS person FROM "select" AS c INNER JOIN orders USING (id)</a></span></dt>
<dt><span class="sect2"><a href="howto-sqlbuilder.html#id-1.3.3.5.7">UPDATE products set ref='A0E''FESP' WHERE id = 14</a></span></dt>
<dt><span class="sect2"><a href="howto-sqlbuilder.html#id-1.3.3.5.8">DELETE FROM items WHERE id = ##theid::int</a></span></dt>
<dt><span class="sect2"><a href="howto-sqlbuilder.html#id-1.3.3.5.9">SELECT myfunc (a, 5, 'Joe') FROM mytable</a></span></dt>
<dt><span class="sect2"><a href="howto-sqlbuilder.html#id-1.3.3.5.10">SELECT name FROM master WHERE id IN (SELECT id FROM subdata)</a></span></dt>
<dt><span class="sect2"><a href="howto-sqlbuilder.html#id-1.3.3.5.11">INSERT INTO customers (e, f, g) SELECT id, name, location FROM subdate</a></span></dt>
<dt><span class="sect2"><a href="howto-sqlbuilder.html#id-1.3.3.5.12">SELECT id, name FROM subdata1 UNION SELECT ident, lastname FROM subdata2</a></span></dt>
<dt><span class="sect2"><a href="howto-sqlbuilder.html#id-1.3.3.5.13">SELECT CASE tag WHEN 'Alpha' THEN 1 WHEN 'Bravo' THEN 2 WHEN 'Charlie' THEN 3 ELSE 0 END FROM data</a></span></dt>
<dt><span class="sect2"><a href="howto-sqlbuilder.html#id-1.3.3.5.14">SELECT product_id, name, sum (4 * 5 * price * 1.200000) FROM invoice_lines</a></span></dt>
<dt><span class="sect2"><a href="howto-sqlbuilder.html#id-1.3.3.5.15">SELECT id, name, adress, cntry_id, countries.name FROM customers INNER JOIN countries ON (countries.id = cntry_id)</a></span></dt>
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<dt><span class="sect1"><a href="howto-exec-select.html">Execute a SELECT command</a></span></dt>
<dt><span class="sect1"><a href="howto-modify-select.html">Modify the result of a SELECT command</a></span></dt>
<dt><span class="sect1"><a href="howto-exec-non-select.html">Execute an INSERT, UPDATE or DELETE command</a></span></dt>
<dt><span class="sect1"><a href="ch12s07.html">Get the last inserted row</a></span></dt>
<dt><span class="sect1"><a href="ch12s08.html">Execute a DDL command</a></span></dt>
<dt><span class="sect1"><a href="howto-meta1.html">Get information about a table's columns</a></span></dt>
<dt><span class="sect1"><a href="howto-meta2.html">Update the meta data about a table</a></span></dt>
<dt><span class="sect1"><a href="ch12s11.html">Validate a DML statement</a></span></dt>
<dt><span class="sect1"><a href="ch12s12.html">Control value's assignment to various objects</a></span></dt>
<dt><span class="sect1"><a href="ch12s13.html">Add your own data to a GdaMetaStore</a></span></dt>
</dl></div>
<p>
This section is a list of small HOWTOs to get started quickly for some specific tasks, without the
need to read all the documentation: quickly get to the code and read the corresponding documentation
for further details.
</p>
<div class="sect1">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="id-1.3.3.3"></a>Open a connection</h2></div></div></div>
<p>
Opening a connection to a database creates a <a class="link" href="GdaConnection.html" title="GdaConnection">GdaConnection</a>
object which is required to execute commands. The connections' parameters (which are specific to each
type of database) can be either specified when opening the connection, or be used to define a
data source (<a class="link" href="connections.html" title="Connecting">DSN</a>) and the DSN name is then specified to open the connection.
</p>
<p>
For example, opening a connection to a PostgreSQL database named "mydb" one could use the following code:
</p>
<pre class="programlisting">
GdaConnection *connection;
connection = gda_connection_open_from_string ("PostgreSQL", "DB_NAME=mydb",
"USERNAME=martin;PASSWORD=luther",
GDA_CONNECTION_OPTIONS_READ_ONLY, NULL);
if (!connection)
g_print ("CONNECTION FAILED\n");
else {
/* use the opened connection */
/* close the connection (assuming it's not used by another object) */
g_object_unref (connection);
}
</pre>
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