MongoCollection::getDBRef

(PECL mongo >=0.9.0)

MongoCollection::getDBRef — Fetches the document pointed to by a database reference

说明

public array MongoCollection::getDBRef ( array $ref )

参数

ref: A database reference.

返回值

Returns the database document pointed to by the reference.

范例

Example #1 MongoCollection::getDBRef() example

  <?php

$playlists  =  $db -> playlists ;

 $myList  =  $playlists -> findOne (array( 'username'  =>  'me' ));

 // fetch each song in the playlist
 foreach ( $myList [ 'songlist' ] as  $songRef ) {
     $song  =  $playlists -> getDBRef ( $songRef );
    echo  $song [ 'title' ] .  "\n" ;
}

 ?>

以上例程的输出类似于：

Dazed and Confused
Ma na ma na
Bohemian Rhapsody

In the above example each $songRef looks something like the following:

Array
    (
        [$ref] => songs
        [$id] => 49902cde5162504500b45c2c
    )

参见

MongoCollection::createDBRef() - 创建一个数据库引用

用户评论:

[#1] manuel at dziubas dot de [2011-04-17 10:10:06]

The "$id" has to be a

new MongoId("...")

in PHP driver!

Ref:
array(
"$ref" => "other_collection",
"$id" => new MongoId("the_referenced_dataobject_id")
)