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Pdo\Pgsql::lobUnlink

(PHP 8 >= 8.4.0)

Pdo\Pgsql::lobUnlink — Deletes the large object

说明

public Pdo\Pgsql::lobUnlink(string $oid): bool

Deletes a large object from the database identified by OID.

注意: This function, and all manipulations of the large object, must be called and carried out 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。

示例

示例 #1 Pdo\Pgsql::lobUnlink() example

This example unlinks a large object from the database prior to deleting the row that references it from the blobs table are used in the examples of Pdo\Pgsql::lobCreate() and Pdo\Pgsql::lobOpen().

<?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\Pgsql::lobCreate() - Creates a new large object
  • Pdo\Pgsql::lobOpen() - Opens an existing large object stream
  • pg_lo_create() - 新建大对象
  • pg_lo_open() - 打开大对象