MongoDB::getCollectionNames

(PECL mongo >=1.3.0)

MongoDB::getCollectionNames — Gets an array of names for all collections in this database

说明

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

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

Note: 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.

参数

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)..

    Note: 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 on the server (does not include idle time). If the operation is not completed by the server within the timeout period, a MongoExecutionTimeoutException will be thrown.

返回值

Returns the collection names as an array of strings.

错误／异常

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

更新日志

版本 说明
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.

范例

Example #1 MongoDB::getCollectionNames() example

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

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

以上例程的输出类似于：

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

参见