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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<!-- splitted from ./en/functions/pgsql.xml, last change in rev 1.82 -->
<refentry xml:id="function.pg-last-oid" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>pg_last_oid</refname>
<refpurpose>Returns the last row's OID</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type class="union"><type>string</type><type>int</type><type>false</type></type><methodname>pg_last_oid</methodname>
<methodparam><type>PgSql\Result</type><parameter>result</parameter></methodparam>
</methodsynopsis>
<para>
<function>pg_last_oid</function> is used to retrieve the
<varname>OID</varname> assigned to an inserted row.
</para>
<para>
OID field became an optional field from PostgreSQL 7.2 and will
not be present by default in PostgreSQL 8.1. When the
OID field is not present in a table, the programmer must use
<function>pg_result_status</function> to check for successful
insertion.
</para>
<para>
To get the value of a <literal>SERIAL</literal> field in an inserted
row, it is necessary to use the PostgreSQL <literal>CURRVAL</literal>
function, naming the sequence whose last value is required. If the
name of the sequence is unknown, the <literal>pg_get_serial_sequence</literal>
PostgreSQL 8.0 function is necessary.
</para>
<para>
PostgreSQL 8.1 has a function <literal>LASTVAL</literal> that returns
the value of the most recently used sequence in the session. This avoids
the need for naming the sequence, table or column altogether.
</para>
<note>
<para>
This function used to be called <function>pg_getlastoid</function>.
</para>
</note>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>result</parameter></term>
<listitem>
&pgsql.parameter.result;
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
An <type>int</type> or <type>string</type> containing the OID assigned to the most recently inserted
row in the specified <parameter>connection</parameter>, or &false; on error or
no available OID.
</para>
</refsect1>
<refsect1 role="changelog">
&reftitle.changelog;
<informaltable>
<tgroup cols="2">
<thead>
<row>
<entry>&Version;</entry>
<entry>&Description;</entry>
</row>
</thead>
<tbody>
&pgsql.changelog.result-object;
</tbody>
</tgroup>
</informaltable>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>pg_last_oid</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
// Connect to the database
pg_connect("dbname=mark host=localhost");
// Create a sample table
pg_query("CREATE TABLE test (a INTEGER) WITH OIDS");
// Insert some data into it
$res = pg_query("INSERT INTO test VALUES (1)");
$oid = pg_last_oid($res);
?>
]]>
</programlisting>
</example>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>pg_query</function></member>
<member><function>pg_result_status</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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