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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision: 297028 $ -->
<refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.mysql-data-seek">
<refnamediv>
<refname>mysql_data_seek</refname>
<refpurpose>Move internal result pointer</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>bool</type><methodname>mysql_data_seek</methodname>
<methodparam><type>resource</type><parameter>result</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 a MySQL fetch function, such as <function>mysql_fetch_assoc</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
<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="errorfunc.constants.errorlevels.e-warning">E_WARNING</link> and
<function>mysql_data_seek</function> will return &false;.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
&mysql.result.description;
<varlistentry>
<term><parameter>row_number</parameter></term>
<listitem>
<para>
The desired row number of the new result pointer.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
&return.success;
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<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>
</refsect1>
<refsect1 role="notes">
&reftitle.notes;
<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>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>mysql_query</function></member>
<member><function>mysql_num_rows</function></member>
<member><function>mysql_fetch_row</function></member>
<member><function>mysql_fetch_assoc</function></member>
<member><function>mysql_fetch_array</function></member>
<member><function>mysql_fetch_object</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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-->
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