<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.13 $ -->
<!-- splitted from ./en/functions/mysql.xml, last change in rev 1.2 -->
  <refentry id="function.mysql-data-seek">
   <refnamediv>
    <refname>mysql_data_seek</refname>
    <refpurpose>Move internal result pointer</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>bool</type><methodname>mysql_data_seek</methodname>
      <methodparam><type>resource</type><parameter>result_identifier</parameter></methodparam>
      <methodparam><type>int</type><parameter>row_number</parameter></methodparam>
     </methodsynopsis>
    <para>
     <function>mysql_data_seek</function> moves the internal row
     pointer of the MySQL result associated with the specified result
     identifier to point to the specified row number.  The next call
     to <function>mysql_fetch_row</function> would return that row.
    </para>
    <para>
     &return.success;
    </para>
    <para>
     <parameter>row_number</parameter> starts at 0. The 
     <parameter>row_number</parameter> should be a value in the range from 0 to
     <function>mysql_num_rows</function> - 1. However if the result set 
     is empty (<function>mysql_num_rows</function> == 0), a seek to 0 will 
     fail with a <link linkend="e-warning">E_WARNING</link> and 
     <function>mysql_data_seek</function> will return &false;.
    </para>
    <note>
     <para>
      The function <function>mysql_data_seek</function> can be used in
      conjunction only with <function>mysql_query</function>, not with
      <function>mysql_unbuffered_query</function>. 
     </para>
    </note>
    <para>
     <example>
      <title><function>mysql_data_seek</function> example</title>
      <programlisting role="php">
<![CDATA[
<?php
$link = mysql_connect('localhost', 'mysql_user', 'mysql_password');
if (!$link) {
    die('Could not connect: ' . mysql_error());
}
$db_selected = mysql_select_db('sample_db');
if (!$db_selected) {
    die('Could not select database: ' . mysql_error());
}
$query = 'SELECT last_name, first_name FROM friends';
$result = mysql_query($query);
if (!$result) {
    die('Query failed: ' . mysql_error());
}
/* fetch rows in reverse order */
for ($i = mysql_num_rows($result) - 1; $i >= 0; $i--) {
    if (!mysql_data_seek($result, $i)) {
        echo "Cannot seek to row $i: " . mysql_error() . "\n";
        continue;
    }

    if (!($row = mysql_fetch_assoc($result))) {
        continue;
    }

    echo $row['last_name'] . ' ' . $row['first_name'] . "<br />\n";
}

mysql_free_result($result);
?>
]]>
      </programlisting>
     </example>
    </para>
    <para>
     See also
     <function>mysql_query</function>,
     <function>mysql_num_rows</function>,
     <function>mysql_fetch_row</function>,
     <function>mysql_fetch_assoc</function>,
     <function>mysql_fetch_array</function>, and
     <function>mysql_fetch_object</function>.
    </para>
   </refsect1>
  </refentry>

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