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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<!-- splitted from ./en/functions/pgsql.xml, last change in rev 1.74 -->
<refentry xml:id="function.pg-lo-read" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>pg_lo_read</refname>
<refpurpose>Read a large object</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type class="union"><type>string</type><type>false</type></type><methodname>pg_lo_read</methodname>
<methodparam><type>PgSql\Lob</type><parameter>lob</parameter></methodparam>
<methodparam choice="opt"><type>int</type><parameter>length</parameter><initializer>8192</initializer></methodparam>
</methodsynopsis>
<para>
<function>pg_lo_read</function> reads at most
<parameter>length</parameter> bytes from a large object and
returns it as a <type>string</type>.
</para>
<para>
To use the large object interface, it is necessary to
enclose it within a transaction block.
</para>
<note>
<para>
This function used to be called <function>pg_loread</function>.
</para>
</note>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>lob</parameter></term>
<listitem>
&pgsql.parameter.lob;
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>length</parameter></term>
<listitem>
<para>
An optional maximum number of bytes to return.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
A <type>string</type> containing <parameter>length</parameter> bytes from the
large object, or &false; on error.
</para>
</refsect1>
<refsect1 role="changelog">
&reftitle.changelog;
<informaltable>
<tgroup cols="2">
<thead>
<row>
<entry>&Version;</entry>
<entry>&Description;</entry>
</row>
</thead>
<tbody>
&pgsql.changelog.lob-object;
</tbody>
</tgroup>
</informaltable>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>pg_lo_read</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");
$data = pg_lo_read($handle, 50000);
pg_query($database, "commit");
echo $data;
?>
]]>
</programlisting>
</example>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>pg_lo_read_all</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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