Find a document with ObjectID in mongoDB

问题:

When I inserted some documents into a collection (without an ObjectID) mongoDB adds its own ObjectIDs.

I want to query a document by its unique ObjectID.

$db->collection_name->find(array('_id'=>'4e49fd8269fd873c0a000000'))); 

It does not work either with prefix of MongoID or ObjectID in front of '4e49fd8269fd873c0a000000'.

What is the proper way to query by ObjectID with mongoDB in PHP?

回答1:

Pretty sure you have to use a MongoId object, eg

$item = $collection->findOne(array(     '_id' => new MongoId('4e49fd8269fd873c0a000000'))); 

The notes on the Querying page are a little obtuse but it does mention...

Unless the user has specified otherwise, the _id field is a MongoId. The most common mistake is attepting to use a string to match a MongoId. Keep in mind that these are two different datatypes, and will not match each other in the same way that the string "array()" is not the same as an empty array

回答2:

I think now the API changes to MongoDB\BSON\ObjectID, also you can use [] to denote an array in PHP 5.4+, so it should be:

$item = $collection->findOne(['_id' => new MongoDB\BSON\ObjectID( idToken )]); 

based on Phil's answer.

回答3:

With alcaeus/mongo-php-adapter (under php 7), needed to convert \MongoId to BSON type:

$filter = []; $filter['_id'] = (new \MongoId('4e49fd8269fd873c0a000000'))->toBSONType(); $cursor = $collection->find($filter); 

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