(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.
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.
db (string)The name of the database on which to execute the command.
command (MongoDB\Driver\Command)The command to execute.
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. |
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().
Returns MongoDB\Driver\Cursor on success.
"session" option is used with an associated transaction in combination with a "readConcern" or "writeConcern" option."session" option is used in combination with an unacknowledged write concern.
| 版本 | 说明 |
|---|---|
| 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.
|
示例 #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);
?>以上示例会输出：
array(1) {
["ok"]=>
float(1)
}
示例 #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);
}
?>以上示例会输出：
object(stdClass)#6 (2) {
["_id"]=>
string(3) "bar"
["sum"]=>
int(10)
}
object(stdClass)#7 (2) {
["_id"]=>
string(3) "foo"
["sum"]=>
int(2)
}
示例 #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.
注意: If a secondary
readPreferenceis used, it is the caller's responsibility to ensure that thecommandcan be executed on a secondary. No validation is done by the driver.
注意: 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().