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https://github.com/sigmasternchen/php-doc-en
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git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@148353 c90b9560-bf6c-de11-be94-00142212c4b1
139 lines
4.1 KiB
XML
139 lines
4.1 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-affected-rows">
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<refnamediv>
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<refname>mysql_affected_rows</refname>
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<refpurpose>Get number of affected rows in previous MySQL
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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>int</type><methodname>mysql_affected_rows</methodname>
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<methodparam choice="opt"><type>resource</type><parameter>
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link_identifier
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</parameter></methodparam>
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</methodsynopsis>
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<para>
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<function>mysql_affected_rows</function> returns the number
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of rows affected by the last INSERT, UPDATE or DELETE query
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associated with <parameter>link_identifier</parameter>. If the
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link identifier isn't specified, the last link opened by
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<function>mysql_connect</function> is assumed.
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</para>
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<note>
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<para>
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If you are using transactions, you need to call
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<function>mysql_affected_rows</function> after your INSERT,
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UPDATE, or DELETE query, not after the commit.
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</para>
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</note>
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<para>
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If the last query was a DELETE query with no WHERE clause, all
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of the records will have been deleted from the table but this
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function will return zero.
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</para>
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<note>
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<para>
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When using UPDATE, MySQL will not update columns where the new
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value is the same as the old value. This creates the possibility
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that <function>mysql_affected_rows</function> may not actually
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equal the number of rows matched, only the number of rows that
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were literally affected by the query.
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</para>
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</note>
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<para>
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<function>mysql_affected_rows</function> does not work with
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SELECT statements; only on statements which modify records. To
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retrieve the number of rows returned by a SELECT, use
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<function>mysql_num_rows</function>.
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</para>
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<para>
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If the last query failed, this function will return -1.
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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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mysql_connect("localhost", "mysql_user", "mysql_password")
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or die("Could not connect: " . mysql_error());
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mysql_select_db("mydb");
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/* this should return the correct numbers of deleted records */
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mysql_query("DELETE FROM mytable WHERE id < 10");
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printf("Records deleted: %d\n", mysql_affected_rows());
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/* without a where clause in a delete statement, it should return 0 */
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mysql_query("DELETE FROM mytable");
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printf("Records deleted: %d\n", mysql_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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</para>
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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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</example>
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</para>
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<para>
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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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mysql_connect("localhost", "mysql_user", "mysql_password") or
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die("Could not connect: " . mysql_error());
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mysql_select_db("mydb");
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/* Update records */
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mysql_query("UPDATE mytable SET used=1 WHERE id < 10");
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printf ("Updated records: %d\n", mysql_affected_rows());
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mysql_query("COMMIT");
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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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</para>
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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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</example>
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</para>
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<para>
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See also <function>mysql_num_rows</function>, and
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<function>mysql_info</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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