php-doc-en/reference/pgsql/functions/pg-lo-open.xml

<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.6 $ -->
<!-- splitted from ./en/functions/pgsql.xml, last change in rev 1.2 -->
<refentry id="function.pg-lo-open">
 <refnamediv>
  <refname>pg_lo_open</refname>
  <refpurpose>Open a large object</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>resource</type><methodname>pg_lo_open</methodname>
   <methodparam><type>resource</type><parameter>connection</parameter></methodparam>
   <methodparam><type>int</type><parameter>oid</parameter></methodparam>
   <methodparam><type>string</type><parameter>mode</parameter></methodparam>
  </methodsynopsis>
  <para>
   <function>pg_lo_open</function> opens a large object in the database
   and returns large object resource so that it can be manipulated.
  </para>
  <warning>
   <para>
    Do not close the database connection before closing the large
    object resource. 
   </para>
  </warning>
  <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 <literal>pg_loopen()</literal>.
   </para>
  </note>
 </refsect1>
 
 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>connection</parameter></term>
     <listitem>
      <para>
       PostgreSQL database connection resource.  When 
       <parameter>connection</parameter> is not present, the default connection 
       is used. The default connection is the last connection made by 
       <function>pg_connect</function> or <function>pg_pconnect</function>.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>oid</parameter></term>
     <listitem>
      <para>
       The <varname>OID</varname> of the large object in the database.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>mode</parameter></term>
     <listitem>
      <para>
       Can be either "r" for read-only, "w" for write only or "rw" for read and 
       write.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   A large object resource or &false; on error.
  </para>
 </refsect1>
 
 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>pg_lo_open</function> example</title>
    <programlisting role="php">
<![CDATA[
<?php
   $database = pg_connect("dbname=jacarta");
   pg_query($database, "begin");
   $oid = pg_lo_create($database);
   echo "$oid\n";
   $handle = pg_lo_open($database, $oid, "w");
   echo "$handle\n";
   pg_lo_write($handle, "large object data");
   pg_lo_close($handle);
   pg_query($database, "commit");
?>
]]>
    </programlisting>
   </example> 
  </para>
 </refsect1>
 
 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>pg_lo_close</function></member>
    <member><function>pg_lo_create</function></member>
   </simplelist>
  </para>
 </refsect1>
</refentry>

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