PHP 8.4.0 RC4 available for testing

MongoDB\Driver\Manager::executeCommand

(mongodb >=1.0.0)

MongoDB\Driver\Manager::executeCommandExecute a database command

Beschreibung

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

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

This method applies no special logic to the command. The Default values for the "readPreference", "readConcern", and "writeConcern" options will be inferred from an active transaction (indicated by the "session" option). If there is no active transaction, a primary read preference will be used for server selection.

Default values will not be inferred from the connection URI. Users are therefore encouraged to use specific read and/or write command methods if possible.

Parameter-Liste

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

Ein Leseanliegen (Read Concern), das auf den Vorgang angewendet werden soll.

Diese Option ist ab MongoDB 3.2 verfügbar. Wenn sie für eine ältere Serverversion angegeben wird, kommt es bei der Ausführung zu einer Exception.

readPreference MongoDB\Driver\ReadPreference

Eine Lesepräferenz, die verwendet wird, um einen Server für die Operation auszuwählen.

session MongoDB\Driver\Session

Eine Session, die mit dem Vorgang verknüpft werden soll.

writeConcern MongoDB\Driver\WriteConcern

Ein Schreibanliegen (Write Concern), das auf den Vorgang angewendet werden soll.

Warnung

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().

Rückgabewerte

Gibt bei Erfolg einen MongoDB\Driver\Cursor zurück.

Fehler/Exceptions

Changelog

Version Beschreibung
PECL mongodb 1.4.4 MongoDB\Driver\Exception\InvalidArgumentException will be thrown if the "session" option is used in combination with an unacknowledged write concern.
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.

Beispiele

Beispiel #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);

?>

Das oben gezeigte Beispiel erzeugt folgende Ausgabe:

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

Beispiel #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);
}

?>

Das oben gezeigte Beispiel erzeugt folgende Ausgabe:

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

Beispiel #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.

Anmerkungen

Hinweis: 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.

Hinweis: This method does not default to using the read preference from the MongoDB Connection URI. Applications in need of that behavior should consider using MongoDB\Driver\Manager::executeReadCommand().

Siehe auch

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