MongoCollection::distinct
(PECL mongo >=1.2.11)
MongoCollection::distinct — Retrieve a list of distinct values for the given key across a collection.
Описание
public array MongoCollection::distinct
( string
$key
[, array $query
] )The distinct command returns a list of distinct values for the given key across a collection.
Список параметров
-
key -
The key to use.
-
query -
An optional query parameters
Возвращаемые значения
Returns an array of distinct values, или FALSE в случае возникновения ошибки
Примеры
Пример #1 MongoCollection::distinct() example
<?php
$m = new Mongo;
$db = $m->selectDB("test");
$db->dropCollection("distinct");
$c = $db->distinct;
$c->insert(array("stuff" => "bar", "zip-code" => 10010));
$c->insert(array("stuff" => "foo", "zip-code" => 10010));
$c->insert(array("stuff" => "bar", "zip-code" => 99701), array("w" => 1));
$retval = $c->distinct("zip-code");
var_dump($retval);
$retval = $c->distinct("zip-code", array("stuff" => "foo"));
var_dump($retval);
$retval = $c->distinct("zip-code", array("stuff" => "bar"));
var_dump($retval);
?>
Результат выполнения данного примера:
array(2) {
[0]=>
int(10010)
[1]=>
int(99701)
}
array(1) {
[0]=>
int(10010)
}
array(2) {
[0]=>
int(10010)
[1]=>
int(99701)
}
Пример #2 MongoCollection::distinct() example on a embedded document
<?php
$c->insert(array("user" => array("points" => 25)));
$c->insert(array("user" => array("points" => 31)));
$c->insert(array("user" => array("points" => 25)));
$retval = $c->distinct("user.points");
var_dump($retval);
$retval = $c->distinct("user.nonexisting");
var_dump($retval);
?>
Результат выполнения данного примера:
array(2) {
[0]=>
int(25)
[1]=>
int(31)
}
array(0) {
}
- PHP Руководство
- Функции по категориям
- Индекс функций
- Справочник функций
- Расширения для работы с базами данных
- Расширения для работы с базами данных отдельных производителей
- MongoDB
- Базовые классы
- Функция MongoCollection::aggregate() - Perform an aggregation using the aggregation framework
- Функция MongoCollection::aggregateCursor() - Execute an aggregation pipeline command and retrieve results through a cursor
- Функция MongoCollection::batchInsert() - Inserts multiple documents into this collection
- Функция MongoCollection::__construct() - Creates a new collection
- Функция MongoCollection::count() - Counts the number of documents in this collection
- Функция MongoCollection::createDBRef() - Creates a database reference
- Функция MongoCollection::createIndex() - Creates an index on the specified field(s) if it does not already exist.
- Функция MongoCollection::deleteIndex() - Deletes an index from this collection
- Функция MongoCollection::deleteIndexes() - Delete all indices for this collection
- Функция MongoCollection::distinct() - Retrieve a list of distinct values for the given key across a collection.
- Функция MongoCollection::drop() - Drops this collection
- Функция MongoCollection::ensureIndex() - Creates an index on the specified field(s) if it does not already exist.
- MongoCollection::find
- Функция MongoCollection::findAndModify() - Update a document and return it
- Функция MongoCollection::findOne() - Queries this collection, returning a single element
- Функция MongoCollection::__get() - Gets a collection
- Функция MongoCollection::getDBRef() - Fetches the document pointed to by a database reference
- Функция MongoCollection::getIndexInfo() - Returns information about indexes on this collection
- Функция MongoCollection::getName() - Returns this collection's name
- Функция MongoCollection::getReadPreference() - Get the read preference for this collection
- Функция MongoCollection::getSlaveOkay() - Get slaveOkay setting for this collection
- Функция MongoCollection::getWriteConcern() - Get the write concern for this collection
- Функция MongoCollection::group() - Performs an operation similar to SQL's GROUP BY command
- Функция MongoCollection::insert() - Inserts a document into the collection
- Функция MongoCollection::parallelCollectionScan() - Returns an array of cursors to iterator over a full collection in parallel
- Функция MongoCollection::remove() - Remove records from this collection
- Функция MongoCollection::save() - Saves a document to this collection
- Функция MongoCollection::setReadPreference() - Set the read preference for this collection
- Функция MongoCollection::setSlaveOkay() - Change slaveOkay setting for this collection
- Функция MongoCollection::setWriteConcern() - Set the write concern for this database
- Функция MongoCollection::toIndexString() - Converts keys specifying an index to its identifying string
- Функция MongoCollection::__toString() - String representation of this collection
- Функция MongoCollection::update() - Update records based on a given criteria
- Функция MongoCollection::validate() - Validates this collection
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