<?xml version="1.0" encoding="utf-8"?>
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<refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.maxdb-rollback">
 <refnamediv>
  <refname>maxdb_rollback</refname>
  <refname>maxdb::rollback</refname>
  <refpurpose>Rolls back current transaction</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <para>&style.procedural;</para>
  <methodsynopsis>
   <type>bool</type><methodname>maxdb_rollback</methodname>
   <methodparam><type>resource</type><parameter>link</parameter></methodparam>
  </methodsynopsis>
  <para>&style.oop;</para>
  <methodsynopsis>
   <type>bool</type><methodname>maxdb::rollback</methodname>
   <void/>
  </methodsynopsis>
  <para>
   Rollbacks the current transaction for the database specified by the
   <parameter>link</parameter> parameter.
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   &return.success;
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <example>
   <title>&style.oop;</title>
   <programlisting role="php">
<![CDATA[
<?php
$maxdb = new maxdb("localhost", "MONA", "RED", "DEMODB");

/* check connection */
if (maxdb_connect_errno()) {
   printf("Connect failed: %s\n", maxdb_connect_error());
   exit();
}

/* disable autocommit */
$maxdb->autocommit(FALSE);

$maxdb->query("CREATE TABLE temp.mycity LIKE hotel.city");
$maxdb->query("INSERT INTO temp.mycity SELECT * FROM hotel.city");

/* commit insert */
$maxdb->commit();

/* delete all rows */
$maxdb->query("DELETE FROM temp.mycity");

if ($result = $maxdb->query("SELECT COUNT(*) FROM temp.mycity")) {
   $row = $result->fetch_row();
   printf("%d rows in table mycity.\n", $row[0]);
   /* Free result */
   $result->close();
}

/* Rollback */
$maxdb->rollback();

if ($result = $maxdb->query("SELECT COUNT(*) FROM temp.mycity")) {
   $row = $result->fetch_row();
   printf("%d rows in table mycity (after rollback).\n", $row[0]);
   /* Free result */
   $result->close();
}

/* Drop table myCity */
$maxdb->query("DROP TABLE temp.mycity");

$maxdb->close();
?>
]]>
   </programlisting>
  </example>
  <example>
   <title>&style.procedural;</title>
   <programlisting role="php">
<![CDATA[
<?php
$link = maxdb_connect("localhost", "MONA", "RED", "DEMODB");

/* check connection */
if (maxdb_connect_errno()) {
   printf("Connect failed: %s\n", maxdb_connect_error());
   exit();
}

/* disable autocommit */
maxdb_autocommit($link, FALSE);

maxdb_query($link, "CREATE TABLE temp.mycity LIKE hotel.city");
maxdb_query($link, "INSERT INTO temp.mycity SELECT * FROM hotel.city");

/* commit insert */
maxdb_commit($link);

/* delete all rows */
maxdb_query($link, "DELETE FROM temp.mycity");

if ($result = maxdb_query($link, "SELECT COUNT(*) FROM temp.mycity")) {
   $row = maxdb_fetch_row($result);
   printf("%d rows in table mycity.\n", $row[0]);
   /* Free result */
   maxdb_free_result($result);
}

/* Rollback */
maxdb_rollback($link);

if ($result = maxdb_query($link, "SELECT COUNT(*) FROM temp.mycity")) {
   $row = maxdb_fetch_row($result);
   printf("%d rows in table mycity (after rollback).\n", $row[0]);
   /* Free result */
   maxdb_free_result($result);
}

/* Drop table myCity */
maxdb_query($link, "DROP TABLE temp.mycity");

maxdb_close($link);
?>
]]>
   </programlisting>
  </example>
  &example.outputs.similar;
  <screen>
<![CDATA[
0 rows in table mycity.
25 rows in table mycity (after rollback).
]]>
  </screen>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>maxdb_commit</function></member>
    <member><function>maxdb_autocommit</function></member>
   </simplelist>
  </para>
 </refsect1>

</refentry>

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