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

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<refentry xml:id="function.pg-lo-create" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>pg_lo_create</refname>
  <refpurpose>Create a large object</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>int</type><methodname>pg_lo_create</methodname>
   <methodparam choice="opt"><type>resource</type><parameter>connection</parameter></methodparam>
   <methodparam choice="opt"><type>mixed</type><parameter>object_id</parameter></methodparam>
  </methodsynopsis>
  <methodsynopsis>
   <type>int</type><methodname>pg_lo_create</methodname>
   <methodparam><type>mixed</type><parameter>object_id</parameter></methodparam>
  </methodsynopsis>
  <para>
   <function>pg_lo_create</function> creates a large
   object and returns the <varname>OID</varname> of the large
   object.  PostgreSQL access modes
   <constant>INV_READ</constant>, <constant>INV_WRITE</constant>, and 
   <constant>INV_ARCHIVE</constant> are not supported, the
   object is created always with both read and write
   access. <constant>INV_ARCHIVE</constant> has been removed from PostgreSQL itself
   (version 6.3 and above).
  </para>
  <para>
   To use the large object interface, it is necessary to
   enclose it within a transaction block.
  </para>
  <para>
   Instead of using the large object interface (which has no access controls
   and is cumbersome to use), try PostgreSQL's <varname>bytea</varname>
   column type and <function>pg_escape_bytea</function>.
  </para>
  <note>
   <para>
    This function used to be called <function>pg_locreate</function>.
   </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>object_id</parameter></term>
     <listitem>
      <para>
       If an <parameter>object_id</parameter> is given the function
       will try to create a large object with this id, else a free
       object id is assigned by the server. The parameter
       was added in PHP 5.3 and relies on functionality that first
       appeared in PostgreSQL 8.1.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>


 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   A large object <varname>OID</varname> or &false; on error.
  </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>5.3.0</entry>
       <entry><para>
        The optional <parameter>object_id</parameter> was added.
       </para></entry>
      </row>
     </tbody>
    </tgroup>
   </informaltable>
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>pg_lo_create</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>
</refentry>

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