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bed14006a3
git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@131038 c90b9560-bf6c-de11-be94-00142212c4b1
109 lines
3.2 KiB
XML
109 lines
3.2 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.7 $ -->
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<refentry id="function.mysqli-affected-rows">
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<refnamediv>
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<refname>mysqli_affected_rows</refname>
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<refpurpose>Gets the number of affected rows in a previous MySQL operation</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>mixed</type><methodname>mysqli_affected_rows</methodname>
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<methodparam><type>resource</type><parameter>link</parameter></methodparam>
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</methodsynopsis>
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<para>
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<function>mysqli_affected_rows</function> returns the number of rows affected by the last
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INSERT, UPDATE, or DELETE query associated with the provided <parameter>link</parameter>
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parameter. If the last query was invalid, this function will return -1.
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</para>
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<note>
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<para>
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When deleting the entire contents of a table (i.e. 'DELETE FROM foo'), this function will
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not return the number of rows that were actually deleted.
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</para>
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</note>
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<para>
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The <function>mysqli_affected_rows</function> function only works with queries which modify
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a table. In order to return the number of rows from a SELECT query, use the
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<function>mysqli_num_rows</function> function instead.
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</para>
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<para>
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<example>
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<title>Delete-Query</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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/* connect to database */
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mysqli_connect("localhost", "mysql_user", "mysql_password") or
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die("Could not connect: " . mysqli_error());
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mysqli_select_db("mydb");
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/* this should return the correct numbers of deleted records */
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mysqli_query("DELETE FROM mytable WHERE id < 10");
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printf ("Records deleted: %d\n", mysqli_affected_rows());
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/* without a where clause in a delete statement, it should return 0 */
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mysqli_query("DELETE FROM mytable");
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printf ("Records deleted: %d\n", mysqli_affected_rows());
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?>
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]]>
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</programlisting>
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<para>
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The above example would produce the following output:
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<screen>
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<![CDATA[
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Records deleted: 10
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Records deleted: 0
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]]>
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</screen>
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</para>
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</example>
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<example>
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<title>Update-Query</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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/* connect to database */
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mysqli_connect("localhost", "mysql_user", "mysql_password") or
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die("Could not connect: " . mysqli_error());
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mysqli_select_db("mydb");
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/* Update records */
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mysqli_query("UPDATE mytable SET used=1 WHERE id < 10");
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printf ("Updated records: %d\n", mysqli_affected_rows());
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?>
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]]>
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</programlisting>
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<para>
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The above example would produce the following output:
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<screen>
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<![CDATA[
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Updated Records: 10
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]]>
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</screen>
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</para>
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</example>
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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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