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<title>Limitations: GNOME Data Access 5 manual</title>
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<div class="chapter">
<div class="titlepage"><div><div><h2 class="title">
<a name="limitations"></a>Limitations</h2></div></div></div>
<div class="toc"><dl class="toc">
<dt><span class="sect1"><a href="limitations.html#limitations_global">Global limitations</a></span></dt>
<dt><span class="sect1"><a href="limitations_mysql.html">For MySQL</a></span></dt>
<dd><dl>
<dt><span class="sect2"><a href="limitations_mysql.html#id-1.2.12.3.2">Multi threaded environment</a></span></dt>
<dt><span class="sect2"><a href="limitations_mysql.html#id-1.2.12.3.3">Statements execution</a></span></dt>
<dt><span class="sect2"><a href="limitations_mysql.html#id-1.2.12.3.4">Timezone information</a></span></dt>
</dl></dd>
<dt><span class="sect1"><a href="limitations_oracle.html">For Oracle</a></span></dt>
<dt><span class="sect1"><a href="limitations_postgres.html">For PostgreSQL</a></span></dt>
<dd><dl>
<dt><span class="sect2"><a href="limitations_postgres.html#id-1.2.12.5.3">BLOB handling</a></span></dt>
<dt><span class="sect2"><a href="limitations_postgres.html#id-1.2.12.5.4">Last inserted row's values</a></span></dt>
<dt><span class="sect2"><a href="limitations_postgres.html#id-1.2.12.5.5">Multi threaded environment</a></span></dt>
<dt><span class="sect2"><a href="limitations_postgres.html#id-1.2.12.5.6">Statements execution</a></span></dt>
<dt><span class="sect2"><a href="limitations_postgres.html#id-1.2.12.5.7">Timezone information</a></span></dt>
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<dt><span class="sect1"><a href="limitations_sqlite.html">For SQLite</a></span></dt>
<dd><dl>
<dt><span class="sect2"><a href="limitations_sqlite.html#id-1.2.12.6.3">Last inserted row's values</a></span></dt>
<dt><span class="sect2"><a href="limitations_sqlite.html#id-1.2.12.6.4">Date and time</a></span></dt>
<dt><span class="sect2"><a href="limitations_sqlite.html#id-1.2.12.6.5">Timezone information</a></span></dt>
<dt><span class="sect2"><a href="limitations_sqlite.html#id-1.2.12.6.6">Multi threaded environment</a></span></dt>
<dt><span class="sect2"><a href="limitations_sqlite.html#id-1.2.12.6.7">Error reporting</a></span></dt>
</dl></dd>
<dt><span class="sect1"><a href="limitations_sqlcipher.html">For SQLCipher</a></span></dt>
<dt><span class="sect1"><a href="limitations_ldap.html">For LDAP</a></span></dt>
<dd><dl>
<dt><span class="sect2"><a href="limitations_ldap.html#id-1.2.12.8.2">User name</a></span></dt>
<dt><span class="sect2"><a href="limitations_ldap.html#id-1.2.12.8.3">SSL/TLS certificate validation</a></span></dt>
</dl></dd>
<dt><span class="sect1"><a href="limitations_jdbc.html">For JDBC based providers</a></span></dt>
<dd><dl>
<dt><span class="sect2"><a href="limitations_jdbc.html#id-1.2.12.9.3">Last inserted row's values</a></span></dt>
<dt><span class="sect2"><a href="limitations_jdbc.html#id-1.2.12.9.4">Multi threaded environment</a></span></dt>
</dl></dd>
</dl></div>
<div class="sect1">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="limitations_global"></a>Global limitations</h2></div></div></div>
<p>
<span class="application">Libgda</span>'s global limitations are:
</p>
<div class="sect2">
<div class="titlepage"><div><div><h3 class="title">
<a name="threads"></a>Multi threaded environment</h3></div></div></div>
<p><span class="application">Libgda</span> is not thread safe. However it supports working with threads as long as any object
(except otherwise stated) created by the API is used by one single thread (that is there is no
situation when two threads try to access the same object at the same time). Exceptions are:
</p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem"><p><span class="application">Libgda</span>'s <a class="link" href="init_config.html" title="Initialization and configuration">configuration</a> can be accessed from any thread</p></li>
<li class="listitem"><p>Any object which implements the <a class="link" href="GdaLockable.html" title="GdaLockable">GdaLockable</a> interface
can be accessed from any thread. However
one can use the <a class="link" href="GdaLockable.html#gda-lockable-lock" title="gda_lockable_lock ()">gda_lockable_lock()</a> method to specifically
lock an object's usage (especially when getting and
setting properties before or after calling methods).</p></li>
<li class="listitem"><p>Any <a class="link" href="GdaConnection.html" title="GdaConnection">GdaConnection</a> object can be accessed from any thread
(that object implements the <a class="link" href="GdaLockable.html" title="GdaLockable">GdaLockable</a> interface). Also
some database providers may impose other limitations (inherited from the database's specific client APIs)
such as only one thread can use the connection object, or even that only one thread can use the database
provider.</p></li>
<li class="listitem"><p>Any <a class="link" href="libgda-5.0-Attributes-manager.html#GdaAttributesManager" title="GdaAttributesManager">GdaAttributesManager</a> can safely be accessed from
any thread.</p></li>
</ul></div>
<p>
</p>
<p>Note that multi threading support is still at an early stage and may contain bugs</p>
</div>
<p>
</p>
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