mysql-errno.xml

<?xml version="1.0" encoding="utf-8"?>
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<refentry xml:id="function.mysql-errno" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
 <refnamediv>
  <refname>mysql_errno</refname>
  <refpurpose>Returns the numerical value of the error message from previous MySQL operation</refpurpose>
 </refnamediv>

 <refsynopsisdiv>
  <warning>
   &mysql.alternative.note;
   <simplelist role="alternatives">
    <member><function>mysqli_errno</function></member>
    <member><methodname>PDO::errorCode</methodname></member>
   </simplelist>
  </warning>
 </refsynopsisdiv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>int</type><methodname>mysql_errno</methodname>
   <methodparam choice="opt"><type>resource</type><parameter>link_identifier</parameter><initializer>NULL</initializer></methodparam>
  </methodsynopsis>
  <para>
   Returns the error number from the last MySQL function. 
  </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.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    &mysql.linkid.description;
   </variablelist>
  </para>
 </refsect1>
 
 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns the error number from the last MySQL function, or
   <literal>0</literal> (zero) if no error occurred.
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>mysql_errno</function> example</title>
    <programlisting role="php">
<![CDATA[
<?php
$link = mysql_connect("localhost", "mysql_user", "mysql_password");

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

mysql_select_db("kossu", $link);
if (!mysql_query("SELECT * FROM nonexistenttable", $link)) {
    echo mysql_errno($link) . ": " . mysql_error($link) . "\n";
}
?>
]]>
    </programlisting>
    &example.outputs.similar;
    <screen>
<![CDATA[
1049: Unknown database 'nonexistentdb'
1146: Table 'kossu.nonexistenttable' doesn't exist
]]>
    </screen>
   </example>
  </para>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>mysql_error</function></member>
    <member><link xlink:href="&url.mysql.docs.error;">MySQL error codes</link></member>
   </simplelist>
  </para>
 </refsect1>
</refentry>

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