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# PDO::pgsqlLOBOpen

(no version information, might be only in CVS)

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

## Description

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.

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

## Parameters

oid

  A large object identifier.

mode

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

## Return Values

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

## Examples

Example 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); ?>`

## See Also

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

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