Php/docs/mongocollection.createdbref
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MongoCollection::createDBRef
(PECL mongo >=0.9.0)
MongoCollection::createDBRef — 创建一个数据库引用
说明
public MongoCollection::createDBRef
( mixed $document_or_id
) : array
参数
document_or_id
- If an array or object is given, its
_id
field will be used as the reference ID. If a MongoId or scalar is given, it will be used as the reference ID.
返回值
返回一个数据库的引用数组。
如果提供了不包含 _id
字段的数组当做 document_or_id
参数,将会返回 null
。
范例
Example #1 MongoCollection::createDBRef() 例子
<?php$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)));?>