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<title>Foreword about abstraction: GNOME Data Access 5 manual</title>
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<div class="chapter">
<div class="titlepage"><div><div><h2 class="title">
<a name="id-1.2.5"></a>Foreword about abstraction</h2></div></div></div>
<div class="toc"><dl class="toc">
<dt><span class="sect1"><a href="ch04.html#placeholders">Variables syntax in SQL</a></span></dt>
<dt><span class="sect1"><a href="null_handling.html">NULL handling when using variables</a></span></dt>
<dt><span class="sect1"><a href="gen_sql_identifiers.html">SQL identifiers</a></span></dt>
<dt><span class="sect1"><a href="gen_blobs.html">Binary large objects (BLOBs)</a></span></dt>
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<p>
<span class="application">Libgda</span> aims both at making it easier to use databases and, for applications written using it,
at making it easier to switch to a different database or to to be able to use different types of databases
with a minimum or no code modifications. To achieve the 2nd goal, <span class="application">Libgda</span> proposes an abstraction of
most of database's engine features, which has to be understood to write portable code.
</p>
<div class="sect1">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="placeholders"></a>Variables syntax in SQL</h2></div></div></div>
<p>
Each database engine has its own way of specifying variables (i.e. place holders) in SQL code (for example:
<code class="code">$<number></code>, <code class="code">:<name></code>, <code class="code">?<number></code>, or <code class="code">?</code>).
<span class="application">Libgda</span> has specified yet another format for variables which can be used with all the databases and which
has the following advantages:
</p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem"><p>allow to specify a name (and optionally a description)</p></li>
<li class="listitem"><p>allow to specify a type, see <a class="link" href="libgda-5.0-Utility-functions.html#gda-g-type-from-string" title="gda_g_type_from_string ()">gda_g_type_from_string()</a></p></li>
<li class="listitem"><p>allow to specify if the variable can be NULL</p></li>
</ul></div>
<p>
</p>
<p>For more information, refer to the <a class="link" href="GdaSqlParser.html#GdaSqlParser.description" title="Description">GdaSqlParser object's documentation</a></p>
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