MongoCollection::createDBRef

(PECL mongo >=0.9.0)

MongoCollection::createDBRef创建一个数据库引用

说明

public array MongoCollection::createDBRef ( mixed $document_or_id )

参数

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.

返回值

返回一个数据库的引用数组。

如果提供了不包含 _id 字段的数组当做 document_or_id 参数,将会返回 NULL

范例

Example #1 MongoCollection::createDBRef() 例子

<?php

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

// 为 song 创建引用
$manamana $songs->findOne(array('title' => 'Ma na ma na'));
$refToSong $songs->createDBRef($manamana);

// 添加引用到我的播放列表
$playlists->update(array('username' => 'me'), array('$push' => array('songlist' => $refToSong)));

?>

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