PDO::pgsqlLOBUnlink()
(PHP 5 >= 5.1.2, PHP 7, PECL pdo_pgsql >= 1.0.2)
Deletes the large object
说明
public PDO::pgsqlLOBUnlink(string $oid): bool
Deletes a large object from the database identified by OID.
Note: This function must be called within a transaction.
参数
- $oid
A large object identifier
返回值
成功时返回TRUE
,或者在失败时返回FALSE
。
范例
Example #1 A PDO::pgsqlLOBUnlink() example
This example unlinks a large object from the database prior to deleting the row that references it from the blobs table we've been using in our PDO::pgsqlLOBCreate() and PDO::pgsqlLOBOpen() examples.
<?php $db = new PDO('pgsql:dbname=test host=localhost', $user, $pass); $db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); $db->beginTransaction(); $db->pgsqlLOBUnlink($oid); $stmt = $db->prepare("DELETE FROM BLOBS where ident = ?"); $stmt->execute(array($some_id)); $db->commit(); ?>
参见
- PDO::pgsqlLOBOpen() Opens an existing large object stream
- PDO::pgsqlLOBCreate() Creates a new large object