International PHP Conference 2019 - Spring Edition

MongoDB\Driver\Manager::executeCommand

(mongodb >=1.0.0)

MongoDB\Driver\Manager::executeCommandExecute a database command

说明

final public MongoDB\Driver\Cursor MongoDB\Driver\Manager::executeCommand ( string $db , MongoDB\Driver\Command $command [, array $options = array() ] )

Selects a server according to the "readPreference" option and executes the command on that server. By default, the read preference from the MongoDB Connection URI will be used.

This method applies no special logic to the command. Although this method accepts "readConcern" and "writeConcern" options, which will be incorporated into the command document, those options will not default to corresponding values from the MongoDB Connection URI nor will the MongoDB server version be taken into account. Users are therefore encouraged to use specific read and/or write command methods if possible.

参数

db (string)

The name of the database on which to execute the command.

command (MongoDB\Driver\Command)

The command to execute.

options

options
Option Type Description
readConcern MongoDB\Driver\ReadConcern

A read concern to apply to the operation.

This option is available in MongoDB 3.2+ and will result in an exception at execution time if specified for an older server version.

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.

writeConcern MongoDB\Driver\WriteConcern

A write concern to apply to the operation.

Warning

If you are using a "session" which has a transaction in progress, you cannot specify a "readConcern" or "writeConcern" option. This will result in an MongoDB\Driver\Exception\InvalidArgumentException being thrown. Instead, you should set these two options when you create the transaction with MongoDB\Driver\Session::startTransaction().

返回值

Returns MongoDB\Driver\Cursor on success.

错误/异常

更新日志

版本 说明
1.4.4 MongoDB\Driver\Exception\InvalidArgumentException will be thrown if the "session" option is used in combination with an unacknowledged write concern.
1.4.0 The third parameter is now an options array. For backwards compatibility, this paramater will still accept a MongoDB\Driver\ReadPreference object.

范例

Example #1 MongoDB\Driver\Manager::executeCommand() with a command returning a single result document

<?php

$manager 
= new MongoDB\Driver\Manager('mongodb://localhost:27017');
$command = new MongoDB\Driver\Command(['ping' => 1]);

try {
    
$cursor $manager->executeCommand('admin'$command);
} catch(
MongoDB\Driver\Exception $e) {
    echo 
$e->getMessage(), "\n";
    exit;
}

/* The ping command returns a single result document, so we need to access the
 * first result in the cursor. */
$response $cursor->toArray()[0];

var_dump($response);

?>

以上例程会输出:

array(1) {
  ["ok"]=>
  float(1)
}

Example #2 MongoDB\Driver\Manager::executeCommand() with a command returning a cursor

<?php

$manager 
= new MongoDB\Driver\Manager("mongodb://localhost:27017");

$bulk = new MongoDB\Driver\BulkWrite;
$bulk->insert(['x' => 1'y' => 'foo']);
$bulk->insert(['x' => 2'y' => 'bar']);
$bulk->insert(['x' => 3'y' => 'bar']);
$manager->executeBulkWrite('db.collection'$bulk);

$command = new MongoDB\Driver\Command([
    
'aggregate' => 'collection',
    
'pipeline' => [
        [
'$group' => ['_id' => '$y''sum' => ['$sum' => '$x']]],
    ],
    
'cursor' => new stdClass,
]);
$cursor $manager->executeCommand('db'$command);

/* The aggregate command can optionally return its results in a cursor instead
 * of a single result document. In this case, we can iterate on the cursor
 * directly to access those results. */
foreach ($cursor as $document) {
    
var_dump($document);
}

?>

以上例程会输出:

object(stdClass)#6 (2) {
  ["_id"]=>
  string(3) "bar"
  ["sum"]=>
  int(10)
}
object(stdClass)#7 (2) {
  ["_id"]=>
  string(3) "foo"
  ["sum"]=>
  int(2)
}

Example #3 Limiting execution time for a command

The execution time of a command may be limited by specifying a value for "maxTimeMS" in the MongoDB\Driver\Command document. 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');

$command = new MongoDB\Driver\Command([
    
'count' => 'collection',
    
'query' => ['x' => ['$gt' => 1]],
    
'maxTimeMS' => 1000,
]);

$cursor $manager->executeCommand('db'$command);

var_dump($cursor->toArray()[0]);

?>

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

注释

Note: If a secondary readPreference is used, it is the caller's responsibility to ensure that the command can be executed on a secondary. No validation is done by the driver.

参见

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