MongoCollection::createDBRef

(PECL mongo >=0.9.0)

MongoCollection::createDBRef — ����һ�����ݿ�����

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public MongoCollection::createDBRef ( mixed $document_or_id ) : array

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document_or_id

If an array or object is given, its _id field will be used as the reference ID. If a MongoId or scalar is given, it will be used as the reference ID.

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����ṩ�˲����� _id �ֶε����鵱�� document_or_id ���������᷵�� NULL��

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Example #1 MongoCollection::createDBRef() ����

<?php

$songs = $db->songs;
$playlists = $db->playlists;

// Ϊ song ��������
$manamana = $songs->findOne(array('title' => 'Ma na ma na'));
$refToSong = $songs->createDBRef($manamana);

// ������õ��ҵIJ����б�
$playlists->update(array('username' => 'me'), array('$push' => array('songlist' => $refToSong)));

?>

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