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

User Contributed Notes

manuel at dziubas dot de 17-Apr-2011 07:10
The "$id" has to be a

new MongoId("...")

in PHP driver!

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