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PDO::pgsqlLOBOpen

(no version information, might be only in CVS)

PDO::pgsqlLOBOpen -- Opens an existing large object stream

Descrizione

resource PDO::pgsqlLOBOpen ( string oid [, string mode] )

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.

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

Elenco dei parametri

oid

A large object identifier.

mode

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

Valori restituiti

Returns a stream resource on success, or FALSE on failure.

Esempi

Esempio 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_ERRMODE, PDO::ERRMODE_EXCEPTION);
$db->beginTransaction();
$stmt = $db->prepare("select oid from BLOBS where ident = ?");
$stmt->execute(array($some_id));
$stmt->bindColumn('oid', $lob, PDO::PARAM_LOB);
$stmt->fetch(PDO::FETCH_BOUND);
fpassthru($lob);
?>

Vedere anche:

PDO::pgsqlLOBCreate()
PDO::pgsqlLOBUnlink()
pg_lo_open()



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