<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.5 $ -->
<!-- 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>
     &return.success;
    </para>
    <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>
     <parameter>Row_number</parameter> starts at 0. The <parameter>
     row_number</parameter> should be a value in the range from 0 to
     mysql_num_rows - 1.
    </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>
    <example>
     <title>MySQL data seek example</title>
     <programlisting role="php">
<![CDATA[
<?php
    $link = mysql_pconnect("localhost", "mysql_user", "mysql_password")
        or die("Could not connect: " . mysql_error());

    mysql_select_db("samp_db")
        or die("Could not select database: " . mysql_error());

    $query = "SELECT last_name, first_name FROM friends";
    $result = mysql_query($query)
        or 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(!($row = mysql_fetch_object($result)))
            continue;

        echo "$row->last_name $row->first_name<br />\n";
    }

    mysql_free_result($result);
?>
]]>
     </programlisting>
    </example>
    <para>
     See also: <function>mysql_query</function>,
               <function>mysql_num_rows</function>.
    </para>
   </refsect1>
  </refentry>

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