php-doc-en/reference/mysql/functions/mysql-errno.xml

<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.8 $ -->
<!-- splitted from ./en/functions/mysql.xml, last change in rev 1.2 -->
  <refentry id="function.mysql-errno">
   <refnamediv>
    <refname>mysql_errno</refname>
    <refpurpose>
     Returns the numerical value of the error message from previous
     MySQL operation
    </refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>int</type><methodname>mysql_errno</methodname>
      <methodparam choice="opt"><type>resource</type><parameter>
        link_identifier
       </parameter></methodparam>
     </methodsynopsis>
    <para>
     Returns the error number from the last MySQL function, or
     <literal>0</literal> (zero) if no error occurred.
    </para>
    <para>
     Errors coming back from the MySQL database backend no longer
     issue warnings. Instead, use <function>mysql_errno</function> to
     retrieve the error code. Note that this function only returns the
     error code from the most recently executed MySQL function (not
     including <function>mysql_error</function> and
     <function>mysql_errno</function>), so if you want to use it,
      make sure you check the value before calling another MySQL
      function.
     <example>
      <title><function>mysql_errno</function> example</title>
      <programlisting role="php">
<![CDATA[
<?php
$link = mysql_connect("localhost", "mysql_user", "mysql_password");

mysql_select_db("nonexistentdb", $link);
echo mysql_errno($link) . ": " . mysql_error($link). "\n";

mysql_select_db("kossu", $link);
mysql_query("SELECT * FROM nonexistenttable", $link);
echo mysql_errno($link) . ": " . mysql_error($link) . "\n";
?>
]]>
      </programlisting>
      <para>
       The above example would produce the following output:
      </para>
       <screen>
<![CDATA[
1049: Unknown database 'nonexistentdb'
1146: Table 'kossu.nonexistenttable' doesn't exist
]]>
       </screen>
     </example>
    </para>
    <note>
     <para>
      If the optional argument is specified the given link
      is used to retrieve the error code. If not, the last
      opened link is used.
     </para>
    </note>
    <para>
     See also <function>mysql_error</function>.
    </para>
   </refsect1>
  </refentry>

<!-- Keep this comment at the end of the file
Local variables:
mode: sgml
sgml-omittag:t
sgml-shorttag:t
sgml-minimize-attributes:nil
sgml-always-quote-attributes:t
sgml-indent-step:1
sgml-indent-data:t
indent-tabs-mode:nil
sgml-parent-document:nil
sgml-default-dtd-file:"../../../../manual.ced"
sgml-exposed-tags:nil
sgml-local-catalogs:nil
sgml-local-ecat-files:nil
End:
vim600: syn=xml fen fdm=syntax fdl=2 si
vim: et tw=78 syn=sgml
vi: ts=1 sw=1
-->