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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision: 297028 $ -->
<!-- splitted from ./en/functions/pgsql.xml, last change in rev 1.2 -->
<refentry xml:id='function.pg-lo-truncate' xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>pg_lo_truncate</refname>
<refpurpose>
Truncates a large object
</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>bool</type><methodname>pg_lo_truncate</methodname>
<methodparam><type>resource</type><parameter>large_object</parameter></methodparam>
<methodparam><type>int</type><parameter>size</parameter></methodparam>
</methodsynopsis>
<para>
<function>pg_lo_truncate</function> truncates a a large object
resource.
</para>
<para>
To use the large object interface, it is necessary to
enclose it within a transaction block.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>large_object</parameter></term>
<listitem>
<para>
PostgreSQL large object (LOB) resource, returned by <function>pg_lo_open</function>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>size</parameter></term>
<listitem>
<para>
The number of bytes to truncate.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
&return.success;
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>pg_lo_truncate</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
$doc_oid = 189762345;
$database = pg_connect("dbname=jacarta");
pg_query($database, "begin");
$handle = pg_lo_open($database, $doc_oid, "r");
// Truncate to 0
pg_lo_truncate($handle, 0);
pg_query($database, "commit");
echo $data;
?>
]]>
</programlisting>
</example>
</para>
</refsect1>
<refsect1 role="changelog">
&reftitle.changelog;
<para>
<informaltable>
<tgroup cols="2">
<thead>
<row>
<entry>&Version;</entry>
<entry>&Description;</entry>
</row>
</thead>
<tbody>
<row>
<entry>5.6.0</entry>
<entry>
Added truncate function. It supports PostgreSQL 9.3's 64bit large object. Both client and server must
support PostgreSQL 9.3 and PHP must be 64bit build to use 64bit large object.
</entry>
</row>
</tbody>
</tgroup>
</informaltable>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>pg_lo_tell</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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