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        KDE 4.4 PyKDE API Reference
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<h1>TransactionSequence Class Reference</h1>
<code>from PyKDE4.akonadi import *</code>
<p>
Inherits: Akonadi.Job &#x2192; <a href="../kdecore/KCompositeJob.html">KCompositeJob</a> &#x2192; <a href="../kdecore/KJob.html">KJob</a> &#x2192; <a href="http://www.riverbankcomputing.co.uk/static/Docs/PyQt4/html/qobject.html">QObject</a><br />
Subclasses: <a href="../akonadi/Akonadi.SpecialCollectionsRequestJob.html">Akonadi.SpecialCollectionsRequestJob</a><br />
Namespace: Akonadi.TransactionSequence<br />
<h2>Detailed Description</h2>

<p>Base class for jobs that need to run a sequence of sub-jobs in a transaction.
</p>
<p>
As soon as the first subjob is added, the transaction is started.
As soon as the last subjob has successfully finished, the transaction is committed.
If any subjob fails, the transaction is rolled back.
</p>
<p>
Alternatively, a TransactionSequence object can be used as a parent object
for a set of jobs to achieve the same behaviour without subclassing.
</p>
<p>
Example:
</p>
<p>
<pre class="fragment">

 // Delete a couple of items inside a transaction
 Akonadi.TransactionSequence *transaction = new TransactionSequence;
 connect( transaction, SIGNAL( result( KJob* ) ), SLOT( transactionFinished( KJob* ) ) );

 const Akonadi.Item.List items = ...

 foreach ( const Akonadi.Item &amp;item, items ) {
   new Akonadi.ItemDeleteJob( item, transaction );
 }

 ...

 MyClass.transactionFinished( KJob *job )
 {
   if ( job-&gt;error() )
     qDebug() &lt;&lt; "Error occurred";
   else
     qDebug() &lt;&lt; "Items deleted successfully";
 }

</pre>
</p>
<p>

<dl class="author" compact><dt><b>Author:</b></dt><dd> Volker Krause &lt;vkrause@kde.org&gt; </dd></dl>
</p>
<table border="0" cellpadding="0" cellspacing="0"><tr><td colspan="2"><br><h2>Methods</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="#TransactionSequence">__init__</a> (self, <a href="http://www.riverbankcomputing.co.uk/static/Docs/PyQt4/html/qobject.html">QObject</a> parent=0)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">bool&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="#addSubjob">addSubjob</a> (self, <a href="../kdecore/KJob.html">KJob</a> job)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="#commit">commit</a> (self)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="#doStart">doStart</a> (self)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="#slotResult">slotResult</a> (self, <a href="../kdecore/KJob.html">KJob</a> job)</td></tr>
</table>
<hr><h2>Method Documentation</h2><a class="anchor" name="TransactionSequence"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname">__init__</td>
<td>(</td>
<td class="paramtype">&nbsp;<em>self</em>, </td>
<td class="paramname"></td>
</tr><tr>
<td class="memname"></td>
<td></td>
<td class="paramtype"><a href="http://www.riverbankcomputing.co.uk/static/Docs/PyQt4/html/qobject.html">QObject</a>&nbsp;</td>
<td class="paramname"><em>parent=0</em></td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td>
<td></td>
<td width="100%"> </td>
</tr></table>
</div>
<div class="memdoc"><p>Creates a new transaction sequence.
</p>
<p>
</p><dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td></td><td valign="top"><em>parent</em>&nbsp;</td><td> The parent object.
</td></tr>
</table></dl>
<p>
</p></div></div><a class="anchor" name="addSubjob"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname">bool addSubjob</td>
<td>(</td>
<td class="paramtype">&nbsp;<em>self</em>, </td>
<td class="paramname"></td>
</tr><tr>
<td class="memname"></td>
<td></td>
<td class="paramtype"><a href="../kdecore/KJob.html">KJob</a>&nbsp;</td>
<td class="paramname"><em>job</em></td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td>
<td></td>
<td width="100%"> </td>
</tr></table>
</div>
<div class="memdoc"></div></div><a class="anchor" name="commit"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname"> commit</td>
<td>(</td>
<td class="paramtype">&nbsp;</td>
<td class="paramname"><em>self</em>&nbsp;)</td>
<td width="100%"> </td>
</tr>
</table>
</div>
<div class="memdoc"><p>Commits the transaction as soon as all pending sub-jobs finished successfully.
</p></div></div><a class="anchor" name="doStart"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname"> doStart</td>
<td>(</td>
<td class="paramtype">&nbsp;</td>
<td class="paramname"><em>self</em>&nbsp;)</td>
<td width="100%"> </td>
</tr>
</table>
</div>
<div class="memdoc"></div></div><a class="anchor" name="slotResult"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname"> slotResult</td>
<td>(</td>
<td class="paramtype">&nbsp;<em>self</em>, </td>
<td class="paramname"></td>
</tr><tr>
<td class="memname"></td>
<td></td>
<td class="paramtype"><a href="../kdecore/KJob.html">KJob</a>&nbsp;</td>
<td class="paramname"><em>job</em></td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td>
<td></td>
<td width="100%"> </td>
</tr></table>
</div>
<div class="memdoc"></div></div>
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