(mongodb >=1.0.0)
MongoDB\Driver\Manager::executeCommand — Execute a database command
$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. By default, the primary server will
be selected.
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.
db
(string)O nome do banco de dados no qual executar o comando.
command
(MongoDB\Driver\Command)O comando a ser executado.
options
Option | Type | Description |
---|---|---|
readConcern | MongoDB\Driver\ReadConcern |
Um read concern a ser aplicado à operação. Esta opção está disponível no MongoDB 3.2+ e resultará em uma exceção em tempo de execução se for especificada para uma versão de servidor mais antiga. |
readPreference | MongoDB\Driver\ReadPreference |
Uma preferência de leitura a ser usada para selecionar um servidor para a operação. |
session | MongoDB\Driver\Session |
Uma sessão para associar à operação. |
writeConcern | MongoDB\Driver\WriteConcern |
Um write concern a ser aplicado à operação. |
Se uma "session"
que tem uma transação em andamento
estiver sendo usada, uma opção "readConcern"
ou
"writeConcern"
não pode ser especificada. Isso resultará em uma
exceção MongoDB\Driver\Exception\InvalidArgumentException
sendo lançada. Em vez disso, essas duas opções devem ser definidas ao criar
a transação com
MongoDB\Driver\Session::startTransaction().
Retorna MongoDB\Driver\Cursor em caso de sucesso.
"session"
for usada com uma transação associada em combinação com uma opção "readConcern"
ou "writeConcern"
."session"
for usada em combinação com um write concern não confirmado.
Versão | Descrição |
---|---|
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.
|
Exemplo #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);
?>
O exemplo acima produzirá:
array(1) { ["ok"]=> float(1) }
Exemplo #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);
}
?>
O exemplo acima produzirá:
object(stdClass)#6 (2) { ["_id"]=> string(3) "bar" ["sum"]=> int(10) } object(stdClass)#7 (2) { ["_id"]=> string(3) "foo" ["sum"]=> int(2) }
Exemplo #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.
Nota: If a secondary
readPreference
is used, it is the caller's responsibility to ensure that thecommand
can be executed on a secondary. No validation is done by the driver.
Nota: 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().