(PHP 8 >= 8.4.0)
Pdo\Pgsql::lobOpen — Opens an existing large object stream
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.
注意: This function, and all manipulations of the large object, must be called and carried out within a transaction.
oidmoder, open the stream for reading.
If mode is w, open the stream for writing.
Returns a stream resource on success, 或者在失败时返回 false.
When does this function issue E_* level errors,
and/or throw Exceptions.
示例 #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);
?>