PHP 7.4.25 Released!

pg_lo_open

(PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)

pg_lo_openOpen a large object

Description

pg_lo_open(PgSql\Connection $connection, int $oid, string $mode): PgSql\Lob|false

pg_lo_open() opens a large object in the database and returns an PgSql\Lob instance so that it can be manipulated.

Warning

Do not close the database connection before closing the PgSql\Lob instance.

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

Note:

This function used to be called pg_loopen().

Parameters

connection

An PgSql\Connection instance. When connection is unspecified, the default connection is used. The default connection is the last connection made by pg_connect() or pg_pconnect().

oid

The OID of the large object in the database.

mode

Can be either "r" for read-only, "w" for write only or "rw" for read and write.

Return Values

An PgSql\Lob instance, or false on failure.

Changelog

Version Description
8.1.0 Returns an PgSql\Lob instance now; previously, a resource was returned.
8.1.0 The connection parameter expects an PgSql\Connection instance now; previously, a resource was expected.

Examples

Example #1 pg_lo_open() 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");
?>

See Also

add a note add a note

User Contributed Notes 1 note

up
1
metator at netcabo dot pt
16 years ago
Just for the record, a user must be a superuser (database owner) in order to invoke pg_lo_open() (though pg_lo_create() may be invoked...). This opens a gigantic security hole in the db. If a user is not a superuser, db will raise an error with message "Can't create Large Object.".
Thus, imho, one should use pg_escape_bytea() instead.
To Top