pg-lo-open.xml

<?xml version="1.0" encoding="utf-8"?>
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<refentry xml:id="function.pg-lo-open" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>pg_lo_open</refname>
  <refpurpose>Open a large object</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type class="union"><type>PgSql\Lob</type><type>false</type></type><methodname>pg_lo_open</methodname>
   <methodparam><type>PgSql\Connection</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 an <classname>PgSql\Lob</classname> instance so that it can be manipulated.
  </para>
  <warning>
   <para>
    Do not close the database connection before closing the <classname>PgSql\Lob</classname> instance.
   </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 <function>pg_loopen</function>.
   </para>
  </note>
 </refsect1>
 
 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>connection</parameter></term>
     <listitem>
      &pgsql.parameter.connection-with-unspecified-default;
     </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>
   An <classname>PgSql\Lob</classname> instance, &return.falseforfailure;.
  </para>
 </refsect1>

 <refsect1 role="changelog">
  &reftitle.changelog;
  <informaltable>
   <tgroup cols="2">
    <thead>
     <row>
      <entry>&Version;</entry>
      <entry>&Description;</entry>
     </row>
    </thead>
    <tbody>
     <row>
      <entry>8.1.0</entry>
      <entry>
       Returns an <classname>PgSql\Lob</classname> instance now;
       previously, a &resource; was returned.
      </entry>
     </row>
     &pgsql.changelog.connection-object;
    </tbody>
   </tgroup>
  </informaltable>
 </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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