MongoDB::listCollections - Gets an array of MongoCollection objects for all collections in this database
Вернуться к: MongoDB
MongoDB::listCollections
(PECL mongo >=0.9.0)
MongoDB::listCollections — Gets an array of MongoCollection objects for all collections in this database
Описание
$options = array()
] )Gets a list of all collections in the database and returns them as an array of MongoCollection objects.
Замечание: This method will use the » listCollections database command when communicating with MongoDB 2.8+. For previous database versions, the method will query the special system.namespaces collection.
Список параметров
-
options -
An array of options for listing the collections. Currently available options include:
"filter"
Optional query criteria. If provided, this criteria will be used to filter the collections included in the result.
Relevant fields that may be queried include "name" (collection name as a string, without the database name prefix) and "options" (object containing options used to create the collection)..
Замечание: MongoDB 2.6 and earlier versions require the "name" criteria, if specified, to be a string value (i.e. equality match). This is because the driver must prefix the value with the database name in order to query the system.namespaces collection. Later versions of MongoDB do not have this limitation, as the driver will use the listCollections command.
"includeSystemCollections"
Boolean, defaults to
FALSE. Determines whether system collections should be included in the result.
The following option may be used with MongoDB 2.8+:
"maxTimeMS"
Указывает суммарный лимит времени в миллисекундах на обработку операции (не включая время простоя). Если операция не завершилась за это время, то бросается MongoExecutionTimeoutException.
Возвращаемые значения
Returns an array of MongoCollection objects.
Ошибки
For MongoDB 2.6 and earlier, MongoException will be thrown if a non-string value was specified for the "filter" option's "name" criteria.
Список изменений
| Версия | Описание |
|---|---|
| 1.6.0 | Changed first parameter to be an array of options. Pre-1.6.0, the first parameter was a boolean indicating the "includeSystemCollections" option. |
| 1.3.0 |
Added the includeSystemCollections parameter.
|
Примеры
Пример #1 MongoDB::listCollections() example
The following example demonstrates running count on each collection in a database.
<?php
$m = new MongoClient();
$db = $m->selectDB("demo");
$collections = $db->listCollections();
foreach ($collections as $collection) {
echo "amount of documents in $collection: ";
echo $collection->count(), "\n";
}
?>
Результатом выполнения данного примера будет что-то подобное:
... amount of documents in demo.pubs: 4 amount of documents in demo.elephpants: 3 amount of documents in demo.cities: 22840 ...
Смотрите также
- MongoDB::getCollectionNames() - Gets an array of names for all collections in this database
- MongoDB::getCollectionInfo() - Returns information about collections in this database
Вернуться к: MongoDB