(PECL mongo >=0.9.0)
MongoCollection::getDBRef — Fetches the document pointed to by a database reference
$ref
)
ref
A database reference.
Returns the database document pointed to by the reference.
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 $song['title'] . "\n";
}
?>
以上例程的输出类似于：
Dazed and Confused Ma na ma na Bohemian Rhapsody
Array
(
[$ref] => songs
[$id] => 49902cde5162504500b45c2c
)
manuel at dziubas dot de (2011-04-17 10:10:06)
The "$id" has to be a
new MongoId("...")
in PHP driver!
Ref:
array(
"$ref" => "other_collection",
"$id" => new MongoId("the_referenced_dataobject_id")
)