Opens an existing large object stream


(PHP 5 >= 5.1.2, PECL pdo_pgsql >= 1.0.2)

PDO::pgsqlLOBOpenOpens an existing large object stream

Описание

public resource PDO::pgsqlLOBOpen ( string $oid [, string $mode = "rb" ] )

PDO::pgsqlLOBOpen() opens a stream to access the data referenced by oid. If mode is r, the stream is opened for reading, if mode is w, then the stream will be opened for writing. You can use all the usual filesystem functions, such as fread(), fwrite() and fgets() to manipulate the contents of the stream.

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

Список параметров

oid

A large object identifier.

mode

If mode is r, open the stream for reading. If mode is w, open the stream for writing.

Возвращаемые значения

Returns a stream resource on success или FALSE в случае возникновения ошибки.

Примеры

Пример #1 A PDO::pgsqlLOBOpen() example

Following on from the PDO::pgsqlLOBCreate() example, this code snippet retrieves the large object from the database and outputs it to the browser.

<?php
$db 
= new PDO('pgsql:dbname=test host=localhost'$user$pass);
$db->setAttribute(PDO::ATTR_ERRMODEPDO::ERRMODE_EXCEPTION);
$db->beginTransaction();
$stmt $db->prepare("select oid from BLOBS where ident = ?");
$stmt->execute(array($some_id));
$stmt->bindColumn('oid'$oidPDO::PARAM_STR);
$stmt->fetch(PDO::FETCH_BOUND);
$stream $db->pgsqlLOBOpen($oid'r');
header("Content-type: application/octet-stream");
fpassthru($stream);
?>

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