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<a href="#GdaPStmt.description" class="shortcut">Description</a>
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<a href="#GdaPStmt.object-hierarchy" class="shortcut">Object Hierarchy</a>
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<h2><span class="refentrytitle"><a name="GdaPStmt.top_of_page"></a>GdaPStmt</span></h2>
<p>GdaPStmt — Prepared statement's base class</p>
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<div class="refsynopsisdiv">
<a name="GdaPStmt.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
#include <libgda/providers-support/gda-pstmt.h>
struct <a class="link" href="GdaPStmt.html#GdaPStmt-struct" title="struct GdaPStmt">GdaPStmt</a>;
<span class="returnvalue">void</span> <a class="link" href="GdaPStmt.html#gda-pstmt-set-gda-statement" title="gda_pstmt_set_gda_statement ()">gda_pstmt_set_gda_statement</a> (<em class="parameter"><code><a class="link" href="GdaPStmt.html" title="GdaPStmt"><span class="type">GdaPStmt</span></a> *pstmt</code></em>,
<em class="parameter"><code><a class="link" href="GdaStatement.html" title="GdaStatement"><span class="type">GdaStatement</span></a> *stmt</code></em>);
<a class="link" href="GdaStatement.html" title="GdaStatement"><span class="returnvalue">GdaStatement</span></a> * <a class="link" href="GdaPStmt.html#gda-pstmt-get-gda-statement" title="gda_pstmt_get_gda_statement ()">gda_pstmt_get_gda_statement</a> (<em class="parameter"><code><a class="link" href="GdaPStmt.html" title="GdaPStmt"><span class="type">GdaPStmt</span></a> *pstmt</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GdaPStmt.html#gda-pstmt-copy-contents" title="gda_pstmt_copy_contents ()">gda_pstmt_copy_contents</a> (<em class="parameter"><code><a class="link" href="GdaPStmt.html" title="GdaPStmt"><span class="type">GdaPStmt</span></a> *src</code></em>,
<em class="parameter"><code><a class="link" href="GdaPStmt.html" title="GdaPStmt"><span class="type">GdaPStmt</span></a> *dest</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="GdaPStmt.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="synopsis">
<a href="http://library.gnome.org/devel/gobject/unstable/gobject-The-Base-Object-Type.html#GObject">GObject</a>
+----GdaPStmt
</pre>
</div>
<div class="refsect1">
<a name="GdaPStmt.description"></a><h2>Description</h2>
<p>
The <a class="link" href="GdaPStmt.html" title="GdaPStmt"><span class="type">GdaPStmt</span></a> represents the association between a <a class="link" href="GdaStatement.html" title="GdaStatement"><span class="type">GdaStatement</span></a> statement and a <span class="emphasis"><em>prepared statement</em></span>
which is database dependent and is an in-memory representation of a statement. Using prepared statement has the
following advantages:
</p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem"><p>the parsing of the SQL has to be done only once, which improves performances if the statement
has to be executed more than once</p></li>
<li class="listitem"><p>if a statement has been prepared, then it means it is syntactically correct and has been
<span class="emphasis"><em>understood</em></span> by the database's API</p></li>
<li class="listitem"><p>it is possible to use variables in prepared statement which eliminates the risk
of SQL code injection</p></li>
</ul></div>
<p>
</p>
<p>
The <a class="link" href="GdaPStmt.html" title="GdaPStmt"><span class="type">GdaPStmt</span></a> is not intended to be instantiated, but subclassed by database provider's implementation.
Once created, the database provider's implementation can decide to associate (for future lookup) to
a <a class="link" href="GdaStatement.html" title="GdaStatement"><span class="type">GdaStatement</span></a> object in a connection using
<a class="link" href="libgda-4.0-Misc-API.html#gda-connection-add-prepared-statement" title="gda_connection_add_prepared_statement ()"><a class="link" href="libgda-4.0-Misc-API.html#gda-connection-add-prepared-statement" title="gda_connection_add_prepared_statement ()"><code class="function">gda_connection_add_prepared_statement()</code></a></a>.
</p>
<p>
The <a class="link" href="GdaPStmt.html" title="GdaPStmt"><span class="type">GdaPStmt</span></a> object can keep a reference to the <a class="link" href="GdaStatement.html" title="GdaStatement"><span class="type">GdaStatement</span></a> object (which can be set and get using
the <a class="link" href="GdaPStmt.html#gda-pstmt-set-gda-statement" title="gda_pstmt_set_gda_statement ()"><a class="link" href="GdaPStmt.html#gda-pstmt-set-gda-statement" title="gda_pstmt_set_gda_statement ()"><code class="function">gda_pstmt_set_gda_statement()</code></a></a> and
<a class="link" href="GdaPStmt.html#gda-pstmt-get-gda-statement" title="gda_pstmt_get_gda_statement ()"><a class="link" href="GdaPStmt.html#gda-pstmt-get-gda-statement" title="gda_pstmt_get_gda_statement ()"><code class="function">gda_pstmt_get_gda_statement()</code></a></a>), however that reference
if a weak one (which means it will be lost if the <a class="link" href="GdaStatement.html" title="GdaStatement"><span class="type">GdaStatement</span></a> object is destroyed).
</p>
</div>
<div class="refsect1">
<a name="GdaPStmt.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="GdaPStmt-struct"></a><h3>struct GdaPStmt</h3>
<pre class="programlisting">struct GdaPStmt;</pre>
<p>
</p>
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<hr>
<div class="refsect2">
<a name="gda-pstmt-set-gda-statement"></a><h3>gda_pstmt_set_gda_statement ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gda_pstmt_set_gda_statement (<em class="parameter"><code><a class="link" href="GdaPStmt.html" title="GdaPStmt"><span class="type">GdaPStmt</span></a> *pstmt</code></em>,
<em class="parameter"><code><a class="link" href="GdaStatement.html" title="GdaStatement"><span class="type">GdaStatement</span></a> *stmt</code></em>);</pre>
<p>
Informs <em class="parameter"><code>pstmt</code></em> that it corresponds to the preparation of the <em class="parameter"><code>stmt</code></em> statement
</p>
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<td><p><span class="term"><em class="parameter"><code>pstmt</code></em> :</span></p></td>
<td>a <a class="link" href="GdaPStmt.html" title="GdaPStmt"><span class="type">GdaPStmt</span></a> object</td>
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<tr>
<td><p><span class="term"><em class="parameter"><code>stmt</code></em> :</span></p></td>
<td>a <a class="link" href="GdaStatement.html" title="GdaStatement"><span class="type">GdaStatement</span></a> object</td>
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<hr>
<div class="refsect2">
<a name="gda-pstmt-get-gda-statement"></a><h3>gda_pstmt_get_gda_statement ()</h3>
<pre class="programlisting"><a class="link" href="GdaStatement.html" title="GdaStatement"><span class="returnvalue">GdaStatement</span></a> * gda_pstmt_get_gda_statement (<em class="parameter"><code><a class="link" href="GdaPStmt.html" title="GdaPStmt"><span class="type">GdaPStmt</span></a> *pstmt</code></em>);</pre>
<p>
Get a pointer to the <a class="link" href="GdaStatement.html" title="GdaStatement"><span class="type">GdaStatement</span></a> which led to the creation of this prepared statement.
</p>
<p>
Note: if that statement has been modified since the creation of <em class="parameter"><code>pstmt</code></em>, then this method
will return <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>
</p>
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<td><p><span class="term"><em class="parameter"><code>pstmt</code></em> :</span></p></td>
<td>a <a class="link" href="GdaPStmt.html" title="GdaPStmt"><span class="type">GdaPStmt</span></a> object</td>
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<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the <a class="link" href="GdaStatement.html" title="GdaStatement"><span class="type">GdaStatement</span></a>. <span class="annotation">[<a href="http://foldoc.org/transfer%20none"><span class="acronym">transfer none</span></a>]</span>
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<div class="refsect2">
<a name="gda-pstmt-copy-contents"></a><h3>gda_pstmt_copy_contents ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gda_pstmt_copy_contents (<em class="parameter"><code><a class="link" href="GdaPStmt.html" title="GdaPStmt"><span class="type">GdaPStmt</span></a> *src</code></em>,
<em class="parameter"><code><a class="link" href="GdaPStmt.html" title="GdaPStmt"><span class="type">GdaPStmt</span></a> *dest</code></em>);</pre>
<p>
Copies <em class="parameter"><code>src</code></em>'s data to <em class="parameter"><code>dest</code></em>
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<td><p><span class="term"><em class="parameter"><code>src</code></em> :</span></p></td>
<td>a <a class="link" href="GdaPStmt.html" title="GdaPStmt"><span class="type">GdaPStmt</span></a> object</td>
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<tr>
<td><p><span class="term"><em class="parameter"><code>dest</code></em> :</span></p></td>
<td>a <a class="link" href="GdaPStmt.html" title="GdaPStmt"><span class="type">GdaPStmt</span></a> object</td>
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