Pdo\Pgsql::lobOpen

(PHP 8 >= 8.4.0)

Pdo\Pgsql::lobOpen — Opens an existing large object stream

Description

public Pdo\Pgsql::lobOpen(string $oid, string $mode = "rb"): resource|false

Pdo\Pgsql::lobOpen() opens a stream to access the data referenced by oid. All usual filesystem functions, such as fread(), fwrite() or fgets() can be used to manipulate the contents of the stream.

Note: This function, and all manipulations of the large object, must be called and carried out within a transaction.

Parameters

oid: A large object identifier.
mode: If mode is r, open the stream for reading. If mode is w, open the stream for writing.

Return Values

Returns a stream resource on success, or false on failure.

Examples

Example #1 Pdo\Pgsql::lobOpen() example

Following on from the Pdo\Pgsql::lobCreate() example, this code snippet retrieves the large object from the database and outputs it to the browser.

<?php
$db = new Pdo\Pgsql('pgsql:dbname=test host=localhost', $user, $pass);
$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$db->beginTransaction();
$stmt = $db->prepare("SELECT oid FROM BLOBS WHERE ident = ?");
$stmt->execute(array($some_id));
$stmt->bindColumn('oid', $oid, PDO::PARAM_STR);
$stmt->fetch(PDO::FETCH_BOUND);
$stream = $db->pgsqlLOBOpen($oid, 'r');
header("Content-type: application/octet-stream");
fpassthru($stream);
?>

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