pg_lo_create

(PHP 4 >= 4.2.0, PHP 5)

pg_lo_create — Create a large object

Description

int pg_lo_create ([ resource $connection [, mixed $object_id ]] )

int pg_lo_create ( mixed $object_id )

pg_lo_create() creates a large object and returns the OID of the large object. PostgreSQL access modes INV_READ, INV_WRITE, and INV_ARCHIVE are not supported, the object is created always with both read and write access. INV_ARCHIVE has been removed from PostgreSQL itself (version 6.3 and above).

To use the large object interface, it is necessary to enclose it within a transaction block.

Instead of using the large object interface (which has no access controls and is cumbersome to use), try PostgreSQL's bytea column type and pg_escape_bytea().

Note:
This function used to be called pg_locreate().

Parameters

connection: PostgreSQL database connection resource. When connection is not present, the default connection is used. The default connection is the last connection made by pg_connect() or pg_pconnect().
object_id: If an object_id 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.

Return Values

A large object OID or FALSE on error.

Changelog

Version	Description
5.3.0	The optional `object_id` was added.

Examples

Example #1 pg_lo_create() example


<?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");
?>

add a note User Contributed Notes pg_lo_create - [1 notes]

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andrea dot galli at acotel dot com ¶

10 years ago


<?php

// --------- OPEN CONN ---



   $conn = pg_connect("host='127.0.0.1' dbname='test' user='usertest' password='passtest'");



// --------- OPEN FILE ---



   $fp = fopen('logo.gif', "r");

   $buffer = fread($fp, filesize('logo.gif'));

   fclose($fp);



// --------- CREATE - INSERT OID ---



   pg_exec($conn, "begin");



   $oid = pg_locreate($conn);



   $rs = pg_exec($conn,"INSERT INTO test(tipo, images) VALUES('A1', $oid);");

   $handle = pg_loopen ($conn, $oid, "w");



   pg_lowrite ($handle, $buffer);

   pg_loclose ($handle);



   pg_exec($conn, "commit");



// --------- OPEN - INSERT OID ---



   $rs = pg_exec($conn, "SELECT images FROM test WHERE tipo = 'A1';");

   $row = pg_fetch_row($rs, 0);



   pg_exec($conn, "begin");

   $loid = pg_loopen($conn, $row[0], "r");



   header("Content-type: image/gif");



   pg_loreadall($loid);

   pg_loclose($loid);



   pg_exec ($conn, "commit");



// --------- UNLINK OID ---



   pg_exec($conn, "begin");



   $loid = $row[0];

   pg_lounlink($conn, $loid);



   pg_exec ($conn, "commit");



// --------- DELETE OID ---



   pg_exec($conn, "DELETE FROM test WHERE tipo = 'A1';");



// --------- CLOSE CONN ---



   pg_close();

?>

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