MongoDB
PHP-Handbuch

MongoDB::getCollectionNames

Gets an array of names for all collections in this database

Beschreibung

public array MongoDB::getCollectionNames ([ array $options = array() ] )

Gets a list of all collections in the database and returns their names as an array of strings.

Hinweis: 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.

Parameter-Liste

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)..

    Hinweis: 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"

    Specifies a cumulative time limit in milliseconds for processing the operation (does not include idle time). If the operation is not completed within the timeout period, a MongoExecutionTimeoutException will be thrown.

Rückgabewerte

Returns the collection names as an array of strings.

Fehler/Exceptions

For MongoDB 2.6 and earlier, MongoException will be thrown if a non-string value was specified for the "filter" option's "name" criteria.

Changelog

Version Beschreibung
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.

Beispiele

Beispiel #1 MongoDB::getCollectionNames example

<?php
$m = new MongoClient();
$db = $m->selectDB("demo");
$collections = $db->getCollectionNames();

foreach ($collections as $collectionName) {
    echo "Found collection: ", $collectionName, "\n";
}
?>

Das oben gezeigte Beispiel erzeugt eine ähnliche Ausgabe wie:

...
Found collection: img
Found collection: beer
Found collection: collation
...

Siehe auch

  • MongoDB::listCollections
  • MongoDB::getCollectionInfo