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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<a href="#libgda-4.0-GdaXaTransaction.synopsis" class="shortcut">Top</a>
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                  <a href="#libgda-4.0-GdaXaTransaction.description" class="shortcut">Description</a>
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<div class="refentry">
<a name="libgda-4.0-GdaXaTransaction"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="libgda-4.0-GdaXaTransaction.top_of_page"></a>GdaXaTransaction</span></h2>
<p>GdaXaTransaction — Distributed transaction manager</p>
</td>
<td valign="top" align="right"></td>
</tr></table></div>
<div class="refsynopsisdiv">
<a name="libgda-4.0-GdaXaTransaction.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">struct              <a class="link" href="libgda-4.0-GdaXaTransaction.html#GdaXaTransaction" title="struct GdaXaTransaction">GdaXaTransaction</a>;
enum                <a class="link" href="libgda-4.0-GdaXaTransaction.html#GdaXaTransactionError" title="enum GdaXaTransactionError">GdaXaTransactionError</a>;
struct              <a class="link" href="libgda-4.0-GdaXaTransaction.html#GdaXaTransactionId" title="struct GdaXaTransactionId">GdaXaTransactionId</a>;
<a class="link" href="libgda-4.0-GdaXaTransaction.html#GdaXaTransaction" title="struct GdaXaTransaction"><span class="returnvalue">GdaXaTransaction</span></a> *  <a class="link" href="libgda-4.0-GdaXaTransaction.html#gda-xa-transaction-new" title="gda_xa_transaction_new ()">gda_xa_transaction_new</a>              (<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint32"><span class="type">guint32</span></a> format</code></em>,
                                                         <em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *global_transaction_id</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>            <a class="link" href="libgda-4.0-GdaXaTransaction.html#gda-xa-transaction-register-connection" title="gda_xa_transaction_register_connection ()">gda_xa_transaction_register_connection</a>
                                                        (<em class="parameter"><code><a class="link" href="libgda-4.0-GdaXaTransaction.html#GdaXaTransaction" title="struct GdaXaTransaction"><span class="type">GdaXaTransaction</span></a> *xa_trans</code></em>,
                                                         <em class="parameter"><code><a class="link" href="GdaConnection.html" title="GdaConnection"><span class="type">GdaConnection</span></a> *cnc</code></em>,
                                                         <em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *branch</code></em>,
                                                         <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> **error</code></em>);
<span class="returnvalue">void</span>                <a class="link" href="libgda-4.0-GdaXaTransaction.html#gda-xa-transaction-unregister-connection" title="gda_xa_transaction_unregister_connection ()">gda_xa_transaction_unregister_connection</a>
                                                        (<em class="parameter"><code><a class="link" href="libgda-4.0-GdaXaTransaction.html#GdaXaTransaction" title="struct GdaXaTransaction"><span class="type">GdaXaTransaction</span></a> *xa_trans</code></em>,
                                                         <em class="parameter"><code><a class="link" href="GdaConnection.html" title="GdaConnection"><span class="type">GdaConnection</span></a> *cnc</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>            <a class="link" href="libgda-4.0-GdaXaTransaction.html#gda-xa-transaction-begin" title="gda_xa_transaction_begin ()">gda_xa_transaction_begin</a>            (<em class="parameter"><code><a class="link" href="libgda-4.0-GdaXaTransaction.html#GdaXaTransaction" title="struct GdaXaTransaction"><span class="type">GdaXaTransaction</span></a> *xa_trans</code></em>,
                                                         <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> **error</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>            <a class="link" href="libgda-4.0-GdaXaTransaction.html#gda-xa-transaction-commit" title="gda_xa_transaction_commit ()">gda_xa_transaction_commit</a>           (<em class="parameter"><code><a class="link" href="libgda-4.0-GdaXaTransaction.html#GdaXaTransaction" title="struct GdaXaTransaction"><span class="type">GdaXaTransaction</span></a> *xa_trans</code></em>,
                                                         <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Singly-Linked-Lists.html#GSList"><span class="type">GSList</span></a> **cnc_to_recover</code></em>,
                                                         <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> **error</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>            <a class="link" href="libgda-4.0-GdaXaTransaction.html#gda-xa-transaction-rollback" title="gda_xa_transaction_rollback ()">gda_xa_transaction_rollback</a>         (<em class="parameter"><code><a class="link" href="libgda-4.0-GdaXaTransaction.html#GdaXaTransaction" title="struct GdaXaTransaction"><span class="type">GdaXaTransaction</span></a> *xa_trans</code></em>,
                                                         <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> **error</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>            <a class="link" href="libgda-4.0-GdaXaTransaction.html#gda-xa-transaction-commit-recovered" title="gda_xa_transaction_commit_recovered ()">gda_xa_transaction_commit_recovered</a> (<em class="parameter"><code><a class="link" href="libgda-4.0-GdaXaTransaction.html#GdaXaTransaction" title="struct GdaXaTransaction"><span class="type">GdaXaTransaction</span></a> *xa_trans</code></em>,
                                                         <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Singly-Linked-Lists.html#GSList"><span class="type">GSList</span></a> **cnc_to_recover</code></em>,
                                                         <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> **error</code></em>);

<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> *             <a class="link" href="libgda-4.0-GdaXaTransaction.html#gda-xa-transaction-id-to-string" title="gda_xa_transaction_id_to_string ()">gda_xa_transaction_id_to_string</a>     (<em class="parameter"><code>const <a class="link" href="libgda-4.0-GdaXaTransaction.html#GdaXaTransactionId" title="struct GdaXaTransactionId"><span class="type">GdaXaTransactionId</span></a> *xid</code></em>);
<a class="link" href="libgda-4.0-GdaXaTransaction.html#GdaXaTransactionId" title="struct GdaXaTransactionId"><span class="returnvalue">GdaXaTransactionId</span></a> * <a class="link" href="libgda-4.0-GdaXaTransaction.html#gda-xa-transaction-string-to-id" title="gda_xa_transaction_string_to_id ()">gda_xa_transaction_string_to_id</a>    (<em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *str</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="libgda-4.0-GdaXaTransaction.description"></a><h2>Description</h2>
<p>
  The <a class="link" href="libgda-4.0-GdaXaTransaction.html#GdaXaTransaction" title="struct GdaXaTransaction"><span class="type">GdaXaTransaction</span></a> object acts as a distributed transaction manager: to make sure local transactions on several
  connections (to possibly different databases and database types) either all succeed or all fail. For more information,
  see the X/Open CAE document Distributed Transaction Processing: The XA Specification.
  This document is published by The Open Group and available at
  <a class="ulink" href="http://www.opengroup.org/public/pubs/catalog/c193.htm" target="_top">http://www.opengroup.org/public/pubs/catalog/c193.htm</a>.
</p>
<p>
  The two phases commit protocol is implemented during the execution of a distributed transaction: modifications
  made on any connection are first <span class="emphasis"><em>prepared</em></span> (which means that they are store in the database), and
  if that phase succeeded for all the involved connections, then the <span class="emphasis"><em>commit</em></span> phase is executed
  (where all the data previously stored during the <span class="emphasis"><em>prepare</em></span> phase are actually committed).
  That second phase may actually fail, but the distributed transaction will still be considered as sucessfull
  as the data stored during the <span class="emphasis"><em>prepare</em></span> phase can be committed afterwards.
</p>
<p>
  A distributed transaction involves the following steps:
  </p>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem"><p>Create a <a class="link" href="libgda-4.0-GdaXaTransaction.html#GdaXaTransaction" title="struct GdaXaTransaction"><span class="type">GdaXaTransaction</span></a> object</p></li>
<li class="listitem"><p>Register the connections which will be part of the distributed transaction with that object
	using <a class="link" href="libgda-4.0-GdaXaTransaction.html#gda-xa-transaction-register-connection" title="gda_xa_transaction_register_connection ()"><code class="function">gda_xa_transaction_register_connection()</code></a></p></li>
<li class="listitem"><p>Beging the distributed transaction using <a class="link" href="libgda-4.0-GdaXaTransaction.html#gda-xa-transaction-begin" title="gda_xa_transaction_begin ()"><code class="function">gda_xa_transaction_begin()</code></a></p></li>
<li class="listitem"><p>Work individually on each connection as normally (make modifications)</p></li>
<li class="listitem"><p>Commit the distributed transaction using <a class="link" href="libgda-4.0-GdaXaTransaction.html#gda-xa-transaction-commit" title="gda_xa_transaction_commit ()"><code class="function">gda_xa_transaction_commit()</code></a></p></li>
<li class="listitem"><p>Discard the <a class="link" href="libgda-4.0-GdaXaTransaction.html#GdaXaTransaction" title="struct GdaXaTransaction"><span class="type">GdaXaTransaction</span></a> object using <a href="http://library.gnome.org/devel/gobject/unstable/gobject-The-Base-Object-Type.html#g-object-unref"><code class="function">g_object_unref()</code></a></p></li>
</ol></div>
<p>
</p>
</div>
<div class="refsect1">
<a name="libgda-4.0-GdaXaTransaction.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="GdaXaTransaction"></a><h3>struct GdaXaTransaction</h3>
<pre class="programlisting">struct GdaXaTransaction {
	GObject                  object;
	GdaXaTransactionPrivate *priv;
};
</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="GdaXaTransactionError"></a><h3>enum GdaXaTransactionError</h3>
<pre class="programlisting">typedef enum
{
        GDA_XA_TRANSACTION_ALREADY_REGISTERED_ERROR,
	GDA_XA_TRANSACTION_DTP_NOT_SUPPORTED_ERROR,
	GDA_XA_TRANSACTION_CONNECTION_BRANCH_LENGTH_ERROR
} GdaXaTransactionError;
</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2">
<a name="GdaXaTransactionId"></a><h3>struct GdaXaTransactionId</h3>
<pre class="programlisting">struct GdaXaTransactionId {
	guint32  format;       /* any number */
	gushort  gtrid_length; /* 1-64 */
	gushort  bqual_length; /* 1-64 */
	char     data [128];
};
</pre>
<p>
Distributed transaction identification, composed of a global format identifier, a global transaction identifier, and a
branch qualifier. For any connection participating in the global transaction, the format and global transaction identifier
should be the same, and the branch qualifier should vary between the connections.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint32"><span class="type">guint32</span></a> <em class="structfield"><code><a name="GdaXaTransactionId.format"></a>format</code></em>;</span></p></td>
<td>Format ID, should be 0 if OSI CCR naming is used, otherwise any positive integer</td>
</tr>
<tr>
<td><p><span class="term"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gushort"><span class="type">gushort</span></a> <em class="structfield"><code><a name="GdaXaTransactionId.gtrid-length"></a>gtrid_length</code></em>;</span></p></td>
<td>length of the global transaction ID (1-64)</td>
</tr>
<tr>
<td><p><span class="term"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gushort"><span class="type">gushort</span></a> <em class="structfield"><code><a name="GdaXaTransactionId.bqual-length"></a>bqual_length</code></em>;</span></p></td>
<td>length of the branch qualification (1-64)</td>
</tr>
<tr>
<td><p><span class="term"><span class="type">char</span> <em class="structfield"><code><a name="GdaXaTransactionId.data"></a>data</code></em>[128];</span></p></td>
<td>concatenated global transaction ID (bytes 0 to (<em class="parameter"><code>gtrid_length</code></em> -1) included) and branch qualification (bytes <em class="parameter"><code>gtrid_length</code></em> to (<em class="parameter"><code>gtrid_length</code></em>+<em class="parameter"><code>bqual_length</code></em> - 1) included)</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gda-xa-transaction-new"></a><h3>gda_xa_transaction_new ()</h3>
<pre class="programlisting"><a class="link" href="libgda-4.0-GdaXaTransaction.html#GdaXaTransaction" title="struct GdaXaTransaction"><span class="returnvalue">GdaXaTransaction</span></a> *  gda_xa_transaction_new              (<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint32"><span class="type">guint32</span></a> format</code></em>,
                                                         <em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *global_transaction_id</code></em>);</pre>
<p>
Creates a new <a class="link" href="libgda-4.0-GdaXaTransaction.html#GdaXaTransaction" title="struct GdaXaTransaction"><span class="type">GdaXaTransaction</span></a> object, which will control the process of
performing a distributed transaction across several connections.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>format</code></em> :</span></p></td>
<td>a format ID</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>global_transaction_id</code></em> :</span></p></td>
<td>the global transaction ID</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the newly created object. <span class="annotation">[<a href="http://foldoc.org/transfer%20full"><span class="acronym">transfer full</span></a>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gda-xa-transaction-register-connection"></a><h3>gda_xa_transaction_register_connection ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>            gda_xa_transaction_register_connection
                                                        (<em class="parameter"><code><a class="link" href="libgda-4.0-GdaXaTransaction.html#GdaXaTransaction" title="struct GdaXaTransaction"><span class="type">GdaXaTransaction</span></a> *xa_trans</code></em>,
                                                         <em class="parameter"><code><a class="link" href="GdaConnection.html" title="GdaConnection"><span class="type">GdaConnection</span></a> *cnc</code></em>,
                                                         <em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *branch</code></em>,
                                                         <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> **error</code></em>);</pre>
<p>
Registers <em class="parameter"><code>cnc</code></em> to be used by <em class="parameter"><code>xa_trans</code></em> to create a distributed transaction.
</p>
<p>
Note: any <a class="link" href="GdaConnection.html" title="GdaConnection"><span class="type">GdaConnection</span></a> object can only be registered with at most one <a class="link" href="libgda-4.0-GdaXaTransaction.html#GdaXaTransaction" title="struct GdaXaTransaction"><span class="type">GdaXaTransaction</span></a> object; also
some connections may not be registered at all with a <a class="link" href="libgda-4.0-GdaXaTransaction.html#GdaXaTransaction" title="struct GdaXaTransaction"><span class="type">GdaXaTransaction</span></a> object because the database
provider being used does not support it.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>xa_trans</code></em> :</span></p></td>
<td>a <a class="link" href="libgda-4.0-GdaXaTransaction.html#GdaXaTransaction" title="struct GdaXaTransaction"><span class="type">GdaXaTransaction</span></a> object</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>cnc</code></em> :</span></p></td>
<td>the connection to add to <em class="parameter"><code>xa_trans</code></em>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>branch</code></em> :</span></p></td>
<td>the branch qualifier</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>error</code></em> :</span></p></td>
<td>a place to store errors, or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. <span class="annotation">[<a href="http://foldoc.org/allow-none"><span class="acronym">allow-none</span></a>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if no error occurred</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gda-xa-transaction-unregister-connection"></a><h3>gda_xa_transaction_unregister_connection ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                gda_xa_transaction_unregister_connection
                                                        (<em class="parameter"><code><a class="link" href="libgda-4.0-GdaXaTransaction.html#GdaXaTransaction" title="struct GdaXaTransaction"><span class="type">GdaXaTransaction</span></a> *xa_trans</code></em>,
                                                         <em class="parameter"><code><a class="link" href="GdaConnection.html" title="GdaConnection"><span class="type">GdaConnection</span></a> *cnc</code></em>);</pre>
<p>
Unregisters <em class="parameter"><code>cnc</code></em> to be used by <em class="parameter"><code>xa_trans</code></em> to create a distributed transaction. This is
the opposite of <a class="link" href="libgda-4.0-GdaXaTransaction.html#gda-xa-transaction-register-connection" title="gda_xa_transaction_register_connection ()"><code class="function">gda_xa_transaction_register_connection()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>xa_trans</code></em> :</span></p></td>
<td>a <a class="link" href="libgda-4.0-GdaXaTransaction.html#GdaXaTransaction" title="struct GdaXaTransaction"><span class="type">GdaXaTransaction</span></a> object</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>cnc</code></em> :</span></p></td>
<td>the connection to add to <em class="parameter"><code>xa_trans</code></em>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gda-xa-transaction-begin"></a><h3>gda_xa_transaction_begin ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>            gda_xa_transaction_begin            (<em class="parameter"><code><a class="link" href="libgda-4.0-GdaXaTransaction.html#GdaXaTransaction" title="struct GdaXaTransaction"><span class="type">GdaXaTransaction</span></a> *xa_trans</code></em>,
                                                         <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> **error</code></em>);</pre>
<p>
Begins a distributed transaction (managed by <em class="parameter"><code>xa_trans</code></em>). Please note that this phase may fail
for some connections if a (normal) transaction is already started (this depends on the database
provider being used), so it's better to avoid starting any (normal) transaction on any of the
connections registered with <em class="parameter"><code>xa_trans</code></em>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>xa_trans</code></em> :</span></p></td>
<td>a <a class="link" href="libgda-4.0-GdaXaTransaction.html#GdaXaTransaction" title="struct GdaXaTransaction"><span class="type">GdaXaTransaction</span></a> object</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>error</code></em> :</span></p></td>
<td>a place to store errors, or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. <span class="annotation">[<a href="http://foldoc.org/allow-none"><span class="acronym">allow-none</span></a>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if no error occurred</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gda-xa-transaction-commit"></a><h3>gda_xa_transaction_commit ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>            gda_xa_transaction_commit           (<em class="parameter"><code><a class="link" href="libgda-4.0-GdaXaTransaction.html#GdaXaTransaction" title="struct GdaXaTransaction"><span class="type">GdaXaTransaction</span></a> *xa_trans</code></em>,
                                                         <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Singly-Linked-Lists.html#GSList"><span class="type">GSList</span></a> **cnc_to_recover</code></em>,
                                                         <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> **error</code></em>);</pre>
<p>
Commits a distributed transaction (managed by <em class="parameter"><code>xa_trans</code></em>). The commit is composed of two phases:
</p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem"><p>a PREPARE phase where all the connections are required to store their transaction data to a 
    permanent place (to be able to complete the commit should a problem occur afterwards)</p></li>
<li class="listitem"><p>a COMMIT phase where the transaction data is actually written to the database</p></li>
</ul></div>
<p>
</p>
<p>
If the PREPARE phase fails for any of the connection registered with <em class="parameter"><code>xa_trans</code></em>, then the distributed commit
fails and FALSE is returned. During the COMMIT phase, some commit may actually fail but the transaction can
still be completed because the PREPARE phase succeeded (through the recover method).
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>xa_trans</code></em> :</span></p></td>
<td>a <a class="link" href="libgda-4.0-GdaXaTransaction.html#GdaXaTransaction" title="struct GdaXaTransaction"><span class="type">GdaXaTransaction</span></a> object</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>cnc_to_recover</code></em> :</span></p></td>
<td>a place to store the list of connections for which the commit phase failed, or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>error</code></em> :</span></p></td>
<td>a place to store errors, or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. <span class="annotation">[<a href="http://foldoc.org/allow-none"><span class="acronym">allow-none</span></a>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if no error occurred (there may be some connections to recover, though)</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gda-xa-transaction-rollback"></a><h3>gda_xa_transaction_rollback ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>            gda_xa_transaction_rollback         (<em class="parameter"><code><a class="link" href="libgda-4.0-GdaXaTransaction.html#GdaXaTransaction" title="struct GdaXaTransaction"><span class="type">GdaXaTransaction</span></a> *xa_trans</code></em>,
                                                         <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> **error</code></em>);</pre>
<p>
Cancels a distributed transaction (managed by <em class="parameter"><code>xa_trans</code></em>).
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>xa_trans</code></em> :</span></p></td>
<td>a <a class="link" href="libgda-4.0-GdaXaTransaction.html#GdaXaTransaction" title="struct GdaXaTransaction"><span class="type">GdaXaTransaction</span></a> object</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>error</code></em> :</span></p></td>
<td>a place to store errors, or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. <span class="annotation">[<a href="http://foldoc.org/allow-none"><span class="acronym">allow-none</span></a>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if no error occurred</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gda-xa-transaction-commit-recovered"></a><h3>gda_xa_transaction_commit_recovered ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>            gda_xa_transaction_commit_recovered (<em class="parameter"><code><a class="link" href="libgda-4.0-GdaXaTransaction.html#GdaXaTransaction" title="struct GdaXaTransaction"><span class="type">GdaXaTransaction</span></a> *xa_trans</code></em>,
                                                         <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Singly-Linked-Lists.html#GSList"><span class="type">GSList</span></a> **cnc_to_recover</code></em>,
                                                         <em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> **error</code></em>);</pre>
<p>
Tries to commit the data prepared but which failed to commit (see <a class="link" href="libgda-4.0-GdaXaTransaction.html#gda-xa-transaction-commit" title="gda_xa_transaction_commit ()"><code class="function">gda_xa_transaction_commit()</code></a>). This
method allows one to terminate a distributed transaction which succeeded but for which some
connections needed to be recovered.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>xa_trans</code></em> :</span></p></td>
<td>a <a class="link" href="libgda-4.0-GdaXaTransaction.html#GdaXaTransaction" title="struct GdaXaTransaction"><span class="type">GdaXaTransaction</span></a> object</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>cnc_to_recover</code></em> :</span></p></td>
<td>a place to store the list of connections for which the there were data to recover and which failed to be actually committed, or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. <span class="annotation">[<a href="http://foldoc.org/allow-none"><span class="acronym">allow-none</span></a>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>error</code></em> :</span></p></td>
<td>a place to store errors, or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. <span class="annotation">[<a href="http://foldoc.org/allow-none"><span class="acronym">allow-none</span></a>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if all the data which was still uncommitted has been committed</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gda-xa-transaction-id-to-string"></a><h3>gda_xa_transaction_id_to_string ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> *             gda_xa_transaction_id_to_string     (<em class="parameter"><code>const <a class="link" href="libgda-4.0-GdaXaTransaction.html#GdaXaTransactionId" title="struct GdaXaTransactionId"><span class="type">GdaXaTransactionId</span></a> *xid</code></em>);</pre>
<p>
Creates a string representation of <em class="parameter"><code>xid</code></em>, in the format &lt;gtrid&gt;,&lt;bqual&gt;,&lt;formatID&gt; the 
&lt;gtrid&gt; and &lt;bqual&gt; strings contain alphanumeric characters, and non alphanumeric characters
are converted to "<code class="literal">ab</code>" where ab is the hexadecimal representation of the character.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>xid</code></em> :</span></p></td>
<td>a <a class="link" href="libgda-4.0-GdaXaTransaction.html#GdaXaTransactionId" title="struct GdaXaTransactionId"><span class="type">GdaXaTransactionId</span></a> pointer</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a new string representation of <em class="parameter"><code>xid</code></em>. <span class="annotation">[<a href="http://foldoc.org/transfer%20full"><span class="acronym">transfer full</span></a>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gda-xa-transaction-string-to-id"></a><h3>gda_xa_transaction_string_to_id ()</h3>
<pre class="programlisting"><a class="link" href="libgda-4.0-GdaXaTransaction.html#GdaXaTransactionId" title="struct GdaXaTransactionId"><span class="returnvalue">GdaXaTransactionId</span></a> * gda_xa_transaction_string_to_id    (<em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *str</code></em>);</pre>
<p>
Creates a new <a class="link" href="libgda-4.0-GdaXaTransaction.html#GdaXaTransactionId" title="struct GdaXaTransactionId"><span class="type">GdaXaTransactionId</span></a> structure from its string representation, it's the opposite
of <a class="link" href="libgda-4.0-GdaXaTransaction.html#gda-xa-transaction-id-to-string" title="gda_xa_transaction_id_to_string ()"><code class="function">gda_xa_transaction_id_to_string()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>str</code></em> :</span></p></td>
<td>a string representation of a <a class="link" href="libgda-4.0-GdaXaTransaction.html#GdaXaTransactionId" title="struct GdaXaTransactionId"><span class="type">GdaXaTransactionId</span></a>, in the "gtrid,bqual,formatID" format</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a new <a class="link" href="libgda-4.0-GdaXaTransaction.html#GdaXaTransactionId" title="struct GdaXaTransactionId"><span class="type">GdaXaTransactionId</span></a> structure, or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> in <em class="parameter"><code>str</code></em> has a wrong format
Free-function: g_free</td>
</tr>
</tbody>
</table></div>
</div>
</div>
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