Pdo\Pgsql::lobOpen
(PHP 8 >= 8.4.0)
Pdo\Pgsql::lobOpen — Opens an existing large object stream
说明
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.
参数
oid- A large object identifier.
mode-
If mode is
r, open the stream for reading. If mode isw, open the stream for writing.
返回值
Returns a stream resource on success, 或者在失败时返回 false.
示例
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);
?>参见
- Pdo\Pgsql::lobCreate() - Creates a new large object
- Pdo\Pgsql::lobUnlink() - Deletes the large object
- pg_lo_create() - 新建大对象
- pg_lo_open() - 打开大对象
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