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https://github.com/sigmasternchen/php-doc-en
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c8b844ebea
git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@169455 c90b9560-bf6c-de11-be94-00142212c4b1
110 lines
3.4 KiB
XML
110 lines
3.4 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.13 $ -->
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<!-- splitted from ./en/functions/mysql.xml, last change in rev 1.2 -->
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<refentry id="function.mysql-data-seek">
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<refnamediv>
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<refname>mysql_data_seek</refname>
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<refpurpose>Move internal result pointer</refpurpose>
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</refnamediv>
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<refsect1>
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<title>Description</title>
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<methodsynopsis>
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<type>bool</type><methodname>mysql_data_seek</methodname>
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<methodparam><type>resource</type><parameter>result_identifier</parameter></methodparam>
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<methodparam><type>int</type><parameter>row_number</parameter></methodparam>
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</methodsynopsis>
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<para>
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<function>mysql_data_seek</function> moves the internal row
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pointer of the MySQL result associated with the specified result
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identifier to point to the specified row number. The next call
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to <function>mysql_fetch_row</function> would return that row.
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</para>
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<para>
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&return.success;
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</para>
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<para>
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<parameter>row_number</parameter> starts at 0. The
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<parameter>row_number</parameter> should be a value in the range from 0 to
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<function>mysql_num_rows</function> - 1. However if the result set
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is empty (<function>mysql_num_rows</function> == 0), a seek to 0 will
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fail with a <link linkend="e-warning">E_WARNING</link> and
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<function>mysql_data_seek</function> will return &false;.
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</para>
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<note>
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<para>
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The function <function>mysql_data_seek</function> can be used in
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conjunction only with <function>mysql_query</function>, not with
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<function>mysql_unbuffered_query</function>.
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</para>
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</note>
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<para>
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<example>
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<title><function>mysql_data_seek</function> example</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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$link = mysql_connect('localhost', 'mysql_user', 'mysql_password');
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if (!$link) {
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die('Could not connect: ' . mysql_error());
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}
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$db_selected = mysql_select_db('sample_db');
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if (!$db_selected) {
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die('Could not select database: ' . mysql_error());
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}
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$query = 'SELECT last_name, first_name FROM friends';
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$result = mysql_query($query);
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if (!$result) {
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die('Query failed: ' . mysql_error());
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}
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/* fetch rows in reverse order */
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for ($i = mysql_num_rows($result) - 1; $i >= 0; $i--) {
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if (!mysql_data_seek($result, $i)) {
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echo "Cannot seek to row $i: " . mysql_error() . "\n";
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continue;
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}
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if (!($row = mysql_fetch_assoc($result))) {
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continue;
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}
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echo $row['last_name'] . ' ' . $row['first_name'] . "<br />\n";
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}
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mysql_free_result($result);
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?>
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]]>
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</programlisting>
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</example>
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</para>
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<para>
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See also
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<function>mysql_query</function>,
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<function>mysql_num_rows</function>,
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<function>mysql_fetch_row</function>,
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<function>mysql_fetch_assoc</function>,
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<function>mysql_fetch_array</function>, and
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<function>mysql_fetch_object</function>.
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</para>
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</refsect1>
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</refentry>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"../../../../manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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