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<h1 class="refname">mysqli::rollback</h1>
<h1 class="refname">mysqli_rollback</h1>
<p class="verinfo">(PHP 5)</p><p class="refpurpose"><span class="refname">mysqli::rollback</span> -- <span class="refname">mysqli_rollback</span> — <span class="dc-title">Rolls back current transaction</span></p>
</div>
<div class="refsect1 description" id="refsect1-mysqli.rollback-description">
<h3 class="title">Description</h3>
<p class="para">Object oriented style</p>
<div class="methodsynopsis dc-description">
<span class="type">bool</span> <span class="methodname"><strong>mysqli::rollback</strong></span>
([ <span class="methodparam"><span class="type">int</span> <code class="parameter">$flags</code></span>
[, <span class="methodparam"><span class="type">string</span> <code class="parameter">$name</code></span>
]] )</div>
<p class="para rdfs-comment">Procedural style</p>
<div class="methodsynopsis dc-description">
<span class="type">bool</span> <span class="methodname"><strong>mysqli_rollback</strong></span>
( <span class="methodparam"><span class="type"><a href="class.mysqli.html" class="type mysqli">mysqli</a></span> <code class="parameter">$link</code></span>
[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$flags</code></span>
[, <span class="methodparam"><span class="type">string</span> <code class="parameter">$name</code></span>
]] )</div>
<p class="para rdfs-comment">
Rollbacks the current transaction for the database.
</p>
</div>
<div class="refsect1 parameters" id="refsect1-mysqli.rollback-parameters">
<h3 class="title">Parameters</h3>
<p class="para">
<dl>
<dt>
<span class="term"><em><code class="parameter">
link</code></em></span><dd>
<p class="para">Procedural style only: A link identifier
returned by <span class="function"><a href="function.mysqli-connect.html" class="function">mysqli_connect()</a></span> or <span class="function"><a href="mysqli.init.html" class="function">mysqli_init()</a></span>
</p></dd>
</dt>
<dt>
<span class="term"><em><code class="parameter">flags</code></em></span>
<dd>
<p class="para">
A bitmask of <strong><code>MYSQLI_TRANS_COR_*</code></strong> constants.
</p>
</dd>
</dt>
<dt>
<span class="term"><em><code class="parameter">name</code></em></span>
<dd>
<p class="para">
If provided then <em>ROLLBACK/*name*/</em> is executed.
</p>
</dd>
</dt>
</dl>
</p>
</div>
<div class="refsect1 returnvalues" id="refsect1-mysqli.rollback-returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
Returns <strong><code>TRUE</code></strong> on success or <strong><code>FALSE</code></strong> on failure.
</p>
</div>
<div class="refsect1 changelog" id="refsect1-mysqli.rollback-changelog">
<h3 class="title">Changelog</h3>
<p class="para">
<table class="doctable informaltable">
<thead>
<tr>
<th>Version</th>
<th>Description</th>
</tr>
</thead>
<tbody class="tbody">
<tr>
<td>5.5.0</td>
<td>
Added <em><code class="parameter">flags</code></em> and <em><code class="parameter">name</code></em>
parameters.
</td>
</tr>
</tbody>
</table>
</p>
</div>
<div class="refsect1 examples" id="refsect1-mysqli.rollback-examples">
<h3 class="title">Examples</h3>
<div class="example" id="example-1681">
<p><strong>Example #1 <span class="methodname"><strong>mysqli::rollback()</strong></span> example</strong></p>
<div class="example-contents"><p>Object oriented style</p></div>
<div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB"><?php<br />$mysqli </span><span style="color: #007700">= new </span><span style="color: #0000BB">mysqli</span><span style="color: #007700">(</span><span style="color: #DD0000">"localhost"</span><span style="color: #007700">, </span><span style="color: #DD0000">"my_user"</span><span style="color: #007700">, </span><span style="color: #DD0000">"my_password"</span><span style="color: #007700">, </span><span style="color: #DD0000">"world"</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">/* check connection */<br /></span><span style="color: #007700">if (</span><span style="color: #0000BB">mysqli_connect_errno</span><span style="color: #007700">()) {<br /> </span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"Connect failed: %s\n"</span><span style="color: #007700">, </span><span style="color: #0000BB">mysqli_connect_error</span><span style="color: #007700">());<br /> exit();<br />}<br /><br /></span><span style="color: #FF8000">/* disable autocommit */<br /></span><span style="color: #0000BB">$mysqli</span><span style="color: #007700">-></span><span style="color: #0000BB">autocommit</span><span style="color: #007700">(</span><span style="color: #0000BB">FALSE</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$mysqli</span><span style="color: #007700">-></span><span style="color: #0000BB">query</span><span style="color: #007700">(</span><span style="color: #DD0000">"CREATE TABLE myCity LIKE City"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$mysqli</span><span style="color: #007700">-></span><span style="color: #0000BB">query</span><span style="color: #007700">(</span><span style="color: #DD0000">"ALTER TABLE myCity Type=InnoDB"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$mysqli</span><span style="color: #007700">-></span><span style="color: #0000BB">query</span><span style="color: #007700">(</span><span style="color: #DD0000">"INSERT INTO myCity SELECT * FROM City LIMIT 50"</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">/* commit insert */<br /></span><span style="color: #0000BB">$mysqli</span><span style="color: #007700">-></span><span style="color: #0000BB">commit</span><span style="color: #007700">();<br /><br /></span><span style="color: #FF8000">/* delete all rows */<br /></span><span style="color: #0000BB">$mysqli</span><span style="color: #007700">-></span><span style="color: #0000BB">query</span><span style="color: #007700">(</span><span style="color: #DD0000">"DELETE FROM myCity"</span><span style="color: #007700">);<br /><br />if (</span><span style="color: #0000BB">$result </span><span style="color: #007700">= </span><span style="color: #0000BB">$mysqli</span><span style="color: #007700">-></span><span style="color: #0000BB">query</span><span style="color: #007700">(</span><span style="color: #DD0000">"SELECT COUNT(*) FROM myCity"</span><span style="color: #007700">)) {<br /> </span><span style="color: #0000BB">$row </span><span style="color: #007700">= </span><span style="color: #0000BB">$result</span><span style="color: #007700">-></span><span style="color: #0000BB">fetch_row</span><span style="color: #007700">();<br /> </span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"%d rows in table myCity.\n"</span><span style="color: #007700">, </span><span style="color: #0000BB">$row</span><span style="color: #007700">[</span><span style="color: #0000BB">0</span><span style="color: #007700">]);<br /> </span><span style="color: #FF8000">/* Free result */<br /> </span><span style="color: #0000BB">$result</span><span style="color: #007700">-></span><span style="color: #0000BB">close</span><span style="color: #007700">();<br />}<br /><br /></span><span style="color: #FF8000">/* Rollback */<br /></span><span style="color: #0000BB">$mysqli</span><span style="color: #007700">-></span><span style="color: #0000BB">rollback</span><span style="color: #007700">();<br /><br />if (</span><span style="color: #0000BB">$result </span><span style="color: #007700">= </span><span style="color: #0000BB">$mysqli</span><span style="color: #007700">-></span><span style="color: #0000BB">query</span><span style="color: #007700">(</span><span style="color: #DD0000">"SELECT COUNT(*) FROM myCity"</span><span style="color: #007700">)) {<br /> </span><span style="color: #0000BB">$row </span><span style="color: #007700">= </span><span style="color: #0000BB">$result</span><span style="color: #007700">-></span><span style="color: #0000BB">fetch_row</span><span style="color: #007700">();<br /> </span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"%d rows in table myCity (after rollback).\n"</span><span style="color: #007700">, </span><span style="color: #0000BB">$row</span><span style="color: #007700">[</span><span style="color: #0000BB">0</span><span style="color: #007700">]);<br /> </span><span style="color: #FF8000">/* Free result */<br /> </span><span style="color: #0000BB">$result</span><span style="color: #007700">-></span><span style="color: #0000BB">close</span><span style="color: #007700">();<br />}<br /><br /></span><span style="color: #FF8000">/* Drop table myCity */<br /></span><span style="color: #0000BB">$mysqli</span><span style="color: #007700">-></span><span style="color: #0000BB">query</span><span style="color: #007700">(</span><span style="color: #DD0000">"DROP TABLE myCity"</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$mysqli</span><span style="color: #007700">-></span><span style="color: #0000BB">close</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">?></span>
</span>
</code></div>
</div>
<div class="example-contents"><p>Procedural style</p></div>
<div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB"><?php<br />$link </span><span style="color: #007700">= </span><span style="color: #0000BB">mysqli_connect</span><span style="color: #007700">(</span><span style="color: #DD0000">"localhost"</span><span style="color: #007700">, </span><span style="color: #DD0000">"my_user"</span><span style="color: #007700">, </span><span style="color: #DD0000">"my_password"</span><span style="color: #007700">, </span><span style="color: #DD0000">"world"</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">/* check connection */<br /></span><span style="color: #007700">if (</span><span style="color: #0000BB">mysqli_connect_errno</span><span style="color: #007700">()) {<br /> </span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"Connect failed: %s\n"</span><span style="color: #007700">, </span><span style="color: #0000BB">mysqli_connect_error</span><span style="color: #007700">());<br /> exit();<br />}<br /><br /></span><span style="color: #FF8000">/* disable autocommit */<br /></span><span style="color: #0000BB">mysqli_autocommit</span><span style="color: #007700">(</span><span style="color: #0000BB">$link</span><span style="color: #007700">, </span><span style="color: #0000BB">FALSE</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">mysqli_query</span><span style="color: #007700">(</span><span style="color: #0000BB">$link</span><span style="color: #007700">, </span><span style="color: #DD0000">"CREATE TABLE myCity LIKE City"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">mysqli_query</span><span style="color: #007700">(</span><span style="color: #0000BB">$link</span><span style="color: #007700">, </span><span style="color: #DD0000">"ALTER TABLE myCity Type=InnoDB"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">mysqli_query</span><span style="color: #007700">(</span><span style="color: #0000BB">$link</span><span style="color: #007700">, </span><span style="color: #DD0000">"INSERT INTO myCity SELECT * FROM City LIMIT 50"</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">/* commit insert */<br /></span><span style="color: #0000BB">mysqli_commit</span><span style="color: #007700">(</span><span style="color: #0000BB">$link</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">/* delete all rows */<br /></span><span style="color: #0000BB">mysqli_query</span><span style="color: #007700">(</span><span style="color: #0000BB">$link</span><span style="color: #007700">, </span><span style="color: #DD0000">"DELETE FROM myCity"</span><span style="color: #007700">);<br /><br />if (</span><span style="color: #0000BB">$result </span><span style="color: #007700">= </span><span style="color: #0000BB">mysqli_query</span><span style="color: #007700">(</span><span style="color: #0000BB">$link</span><span style="color: #007700">, </span><span style="color: #DD0000">"SELECT COUNT(*) FROM myCity"</span><span style="color: #007700">)) {<br /> </span><span style="color: #0000BB">$row </span><span style="color: #007700">= </span><span style="color: #0000BB">mysqli_fetch_row</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">);<br /> </span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"%d rows in table myCity.\n"</span><span style="color: #007700">, </span><span style="color: #0000BB">$row</span><span style="color: #007700">[</span><span style="color: #0000BB">0</span><span style="color: #007700">]);<br /> </span><span style="color: #FF8000">/* Free result */<br /> </span><span style="color: #0000BB">mysqli_free_result</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">);<br />}<br /><br /></span><span style="color: #FF8000">/* Rollback */<br /></span><span style="color: #0000BB">mysqli_rollback</span><span style="color: #007700">(</span><span style="color: #0000BB">$link</span><span style="color: #007700">);<br /><br />if (</span><span style="color: #0000BB">$result </span><span style="color: #007700">= </span><span style="color: #0000BB">mysqli_query</span><span style="color: #007700">(</span><span style="color: #0000BB">$link</span><span style="color: #007700">, </span><span style="color: #DD0000">"SELECT COUNT(*) FROM myCity"</span><span style="color: #007700">)) {<br /> </span><span style="color: #0000BB">$row </span><span style="color: #007700">= </span><span style="color: #0000BB">mysqli_fetch_row</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">);<br /> </span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"%d rows in table myCity (after rollback).\n"</span><span style="color: #007700">, </span><span style="color: #0000BB">$row</span><span style="color: #007700">[</span><span style="color: #0000BB">0</span><span style="color: #007700">]);<br /> </span><span style="color: #FF8000">/* Free result */<br /> </span><span style="color: #0000BB">mysqli_free_result</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">);<br />}<br /><br /></span><span style="color: #FF8000">/* Drop table myCity */<br /></span><span style="color: #0000BB">mysqli_query</span><span style="color: #007700">(</span><span style="color: #0000BB">$link</span><span style="color: #007700">, </span><span style="color: #DD0000">"DROP TABLE myCity"</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">mysqli_close</span><span style="color: #007700">(</span><span style="color: #0000BB">$link</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span>
</span>
</code></div>
</div>
<div class="example-contents"><p>The above examples will output:</p></div>
<div class="example-contents screen">
<div class="cdata"><pre>
0 rows in table myCity.
50 rows in table myCity (after rollback).
</pre></div>
</div>
</div>
</div>
<div class="refsect1 seealso" id="refsect1-mysqli.rollback-seealso">
<h3 class="title">See Also</h3>
<p class="para">
<ul class="simplelist">
<li class="member"> <span class="function"><a href="mysqli.begin-transaction.html" class="function" rel="rdfs-seeAlso">mysqli_begin_transaction()</a> - Starts a transaction</span></li>
<li class="member"> <span class="function"><a href="mysqli.commit.html" class="function" rel="rdfs-seeAlso">mysqli_commit()</a> - Commits the current transaction</span></li>
<li class="member"> <span class="function"><a href="mysqli.autocommit.html" class="function" rel="rdfs-seeAlso">mysqli_autocommit()</a> - Turns on or off auto-committing database modifications</span></li>
<li class="member"> <span class="function"><a href="mysqli.release-savepoint.html" class="function" rel="rdfs-seeAlso">mysqli_release_savepoint()</a> - Rolls back a transaction to the named savepoint</span></li>
</ul>
</p>
</div>
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