Php/docs/mongocommandcursor.construct
MongoCommandCursor::__construct
(PECL mongo >=1.5.0)
MongoCommandCursor::__construct — Create a new command cursor
说明
public MongoCommandCursor::__construct
( MongoClient $connection
, string $ns
, array $command = array()
)
Generally, you should not have to construct a MongoCommandCursor manually, as there are helper functions such as MongoCollection::aggregateCursor() and MongoCollection::parallelCollectionScan(); however, if the server introduces new commands that can return cursors, this constructor will be useful in the absence of specific helper methods. You may also consider using MongoCommandCursor::createFromDocument().
参数
connection- Database connection.
ns- Full name of the database and collection (e.g.
"test.foo") command- Database command.
返回值
Returns the new cursor.
范例
Example #1 MongoCommandCursor example
<?php$m = new MongoClient;// Define the aggregation pipeline$pipeline = [ [ '$group' => [ '_id' => '$country_code', 'timezones' => [ '$addToSet' => '$timezone' ] ] ], [ '$sort' => [ '_id' => 1 ] ],];// Construct a MongoCommandCursor object$cursor = new MongoCommandCursor( $m, // MongoClient object 'demo.cities', // namespace [ 'aggregate' => 'cities', 'pipeline' => $pipeline, 'cursor' => [ 'batchSize' => 0 ], ]);foreach($cursor as $result) { …}?>
参见
- MongoCommandCursor::createFromDocument() - Create a new command cursor from an existing command response document
- MongoCollection::aggregateCursor() - Execute an aggregation pipeline command and retrieve results through a cursor
- MongoCollection::parallelCollectionScan() - Returns an array of cursors to iterator over a full collection in parallel
