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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="function.mysql-insert-id" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>mysql_insert_id</refname>
<refpurpose>Get the ID generated in the last query</refpurpose>
</refnamediv>
<refsynopsisdiv>
<warning>
&mysql.alternative.note;
<simplelist role="alternatives">
<member><function>mysqli_insert_id</function></member>
<member><methodname>PDO::lastInsertId</methodname></member>
</simplelist>
</warning>
</refsynopsisdiv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>int</type><methodname>mysql_insert_id</methodname>
<methodparam choice="opt"><type>resource</type><parameter>link_identifier</parameter><initializer>NULL</initializer></methodparam>
</methodsynopsis>
<para>
Retrieves the ID generated for an AUTO_INCREMENT column by the previous
query (usually INSERT).
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
&mysql.linkid.description;
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
The ID generated for an AUTO_INCREMENT column by the previous
query on success, <literal>0</literal> if the previous
query does not generate an AUTO_INCREMENT value, or &false; if
no MySQL connection was established.
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>mysql_insert_id</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
$link = mysql_connect('localhost', 'mysql_user', 'mysql_password');
if (!$link) {
die('Could not connect: ' . mysql_error());
}
mysql_select_db('mydb');
mysql_query("INSERT INTO mytable (product) values ('kossu')");
printf("Last inserted record has id %d\n", mysql_insert_id());
?>
]]>
</programlisting>
</example>
</para>
</refsect1>
<refsect1 role="notes">
&reftitle.notes;
<caution>
<para>
<function>mysql_insert_id</function> will convert the return type of the
native MySQL C API function <literal>mysql_insert_id()</literal> to a type
of <literal>long</literal> (named <type>int</type> in PHP). If your
AUTO_INCREMENT column has a column type of BIGINT (64 bits) the
conversion may result in an incorrect value. Instead, use the internal
MySQL SQL function LAST_INSERT_ID() in an SQL query. For more information
about PHP's maximum integer values, please see the
<link linkend="language.types.integer">integer</link> documentation.
</para>
</caution>
<note>
<para>
Because <function>mysql_insert_id</function> acts on the last performed
query, be sure to call <function>mysql_insert_id</function> immediately
after the query that generates the value.
</para>
</note>
<note>
<para>
The value of the MySQL SQL function
<literal>LAST_INSERT_ID()</literal> always contains the most
recently generated AUTO_INCREMENT value, and is not reset
between queries.
</para>
</note>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>mysql_query</function></member>
<member><function>mysql_info</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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