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<h2 class="title" style="clear: both"><a id="upgrade_4_0_txn"></a>Release 4.0: txn_XXX</h2>
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<p>The C API for the Berkeley DB Transaction subsystem was reworked in the 4.0
release as follows:</p>
<div class="informaltable">
<table border="1" width="80%">
<colgroup>
<col />
<col />
</colgroup>
<thead>
<tr>
<th>Historic functional interface</th>
<th>Berkeley DB 4.X method</th>
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<tbody>
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<td>txn_abort</td>
<td>
<a href="../api_reference/C/txnabort.html" class="olink">DB_TXN->abort()</a>
</td>
</tr>
<tr>
<td>txn_begin</td>
<td>
<a href="../api_reference/C/txnbegin.html" class="olink">DB_ENV->txn_begin()</a>
</td>
</tr>
<tr>
<td>txn_checkpoint</td>
<td>
<a href="../api_reference/C/txncheckpoint.html" class="olink">DB_ENV->txn_checkpoint()</a>
</td>
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<td>txn_commit</td>
<td>
<a href="../api_reference/C/txncommit.html" class="olink">DB_TXN->commit()</a>
</td>
</tr>
<tr>
<td>txn_discard</td>
<td>
<a href="../api_reference/C/txndiscard.html" class="olink">DB_TXN->discard()</a>
</td>
</tr>
<tr>
<td>txn_id</td>
<td>
<a href="../api_reference/C/txnid.html" class="olink">DB_TXN->id()</a>
</td>
</tr>
<tr>
<td>txn_prepare</td>
<td>
<a href="../api_reference/C/txnprepare.html" class="olink">DB_TXN->prepare()</a>
</td>
</tr>
<tr>
<td>txn_recover</td>
<td>
<a href="../api_reference/C/txnrecover.html" class="olink">DB_TXN->recover()</a>
</td>
</tr>
<tr>
<td>txn_stat</td>
<td>
<a href="../api_reference/C/txnstat.html" class="olink">DB_TXN->stat()</a>
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<p>Applications calling any of these functions should update their calls
to use the enclosing <a href="../api_reference/C/env.html" class="olink">DB_ENV class</a> handle's method
(easily done as the first argument to the existing call is the correct
handle to use).</p>
<p>As a special case, since applications might potentially have many calls
to the txn_abort, txn_begin and txn_commit functions, those functions
continue to work unchanged in the Berkeley DB 4.0 release.</p>
<p>In addition, the <a href="../api_reference/C/txnstat.html" class="olink">DB_TXN->stat()</a> call has been changed in the 4.0
release to take a flags argument. To leave their historic behavior
unchanged, applications should add a final argument of 0 to any calls
made to <a href="../api_reference/C/txnstat.html" class="olink">DB_TXN->stat()</a>.</p>
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