Execute a database query

# MongoDB\Driver\Manager::executeQuery

(mongodb >=1.0.0)

MongoDB\Driver\Manager::executeQuery — Execute a database query

### Description

final public MongoDB\Driver\Manager::executeQuery(string `$namespace`, MongoDB\Driver\Query `$query`, ?array `$options` = `null`): MongoDB\Driver\Cursor

Selects a server according to the `"readPreference"` option and executes the query on that server.

Default values for the `"readPreference"` option and Query's `"readConcern"` option will be inferred from an active transaction (indicated by the `"session"` option), followed by the connection URI.

### Parameters

`namespace` (string)

  A fully qualified namespace (e.g. `"databaseName.collectionName"`).

`query` (MongoDB\Driver\Query)

  The query to execute.

`options`

  options
  Option | Type | Description
  --- | --- | ---
  readPreference | MongoDB\Driver\ReadPreference | A read preference to use for selecting a server for the operation.
  session | MongoDB\Driver\Session | A session to associate with the operation.

### Return Values

Returns MongoDB\Driver\Cursor on success.

### Errors/Exceptions

- Throws MongoDB\Driver\Exception\InvalidArgumentException on argument parsing errors.
- Throws MongoDB\Driver\Exception\ConnectionException if connection to the server fails (for reasons other than authentication).
- Throws MongoDB\Driver\Exception\AuthenticationException if authentication is needed and fails.
- Throws MongoDB\Driver\Exception\RuntimeException on other errors (e.g. invalid query operators).

### Changelog

Version | Description
--- | ---
PECL mongodb 2.0.0 | The `options` parameter no longer accepts a MongoDB\Driver\ReadPreference instance.
PECL mongodb 1.21.0 | Passing a MongoDB\Driver\ReadPreference object as `options` is deprecated and will be removed in 2.0.
PECL mongodb 1.4.0 | The third parameter is now an `options` array. For backwards compatibility, this paramater will still accept a MongoDB\Driver\ReadPreference object.

### Examples

Example #1 MongoDB\Driver\Manager::executeQuery() example

`<?php
$manager = new MongoDB\Driver\Manager("mongodb://localhost:27017");
$bulk = new MongoDB\Driver\BulkWrite;
$bulk->insert(['x' => 1]);
$bulk->insert(['x' => 2]);
$bulk->insert(['x' => 3]);
$manager->executeBulkWrite('db.collection', $bulk);
$filter = ['x' => ['$gt' => 1]];
$options = [
'projection' => ['_id' => 0],
'sort' => ['x' => -1],
];
$query = new MongoDB\Driver\Query($filter, $options);
$cursor = $manager->executeQuery('db.collection', $query);
foreach ($cursor as $document) {
var_dump($document);
}
?>`

The above example will output:

    object(stdClass)#6 (1) {
      ["x"]=>
      int(3)
    }
    object(stdClass)#7 (1) {
      ["x"]=>
      int(2)
    }

Example #2 Limiting execution time for a query

The `"maxTimeMS"` MongoDB\Driver\Query option may be used to limit the execution time of a query. Note that this time limit is enforced on the server side and does not take network latency into account. See » Terminate Running Operations in the MongoDB manual for more information.

`<?php
$manager = new MongoDB\Driver\Manager('mongodb://localhost:27017');
$filter = ['x' => ['$gt' => 1]];
$options = [
'maxTimeMS' => 1000,
];
$query = new MongoDB\Driver\Query($filter, $options);
$cursor = $manager->executeQuery('db.collection', $query);
foreach ($cursor as $document) {
var_dump($document);
}
?>`

If the query fails to complete after one second of execution time on the server, a MongoDB\Driver\Exception\ExecutionTimeoutException will be thrown.

### See Also

- MongoDB\Driver\Cursor
- MongoDB\Driver\Query
- MongoDB\Driver\ReadPreference
- MongoDB\Driver\Server::executeQuery() - Execute a database query on this server

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