Php/docs/class.mongodb-driver-command

• PHP Manual
• MongoDB\Driver
• The MongoDB\Driver\Command class

(mongodb >=1.0.0)

简介

The MongoDB\Driver\Command class is a value object that represents a database command.

To provide “Command Helpers” the MongoDB\Driver\Command object should be composed.

类摘要

final MongoDB\Driver\Command {

/* 方法 */

final public __construct ( array|object $document [, array $commandOptions ] )

}

范例

Example #1 Composing MongoDB\Driver\Command to provide a helper to create collections

<?phpclass CreateCollection {    protected $cmd = array();    function __construct($collectionName) {        $this->cmd["create"] = (string)$collectionName;    }    function setCappedCollection($maxBytes, $maxDocuments = false) {        $this->cmd["capped"] = true;        $this->cmd["size"]   = (int)$maxBytes;        if ($maxDocuments) {            $this->cmd["max"] = (int)$maxDocuments;        }    }    function usePowerOf2Sizes($bool) {        if ($bool) {            $this->cmd["flags"] = 1;        } else {            $this->cmd["flags"] = 0;        }    }    function setFlags($flags) {        $this->cmd["flags"] = (int)$flags;    }    function getCommand() {        return new MongoDB\Driver\Command($this->cmd);    }    function getCollectionName() {        return $this->cmd["create"];    }}$manager = new MongoDB\Driver\Manager("mongodb://localhost:27017");$createCollection = new CreateCollection("cappedCollection");$createCollection->setCappedCollection(64 * 1024);try {    $command = $createCollection->getCommand();    $cursor = $manager->executeCommand("databaseName", $command);    $response = $cursor->toArray()[0];    var_dump($response);    $collstats = ["collstats" => $createCollection->getCollectionName()];    $cursor = $manager->executeCommand("databaseName", new MongoDB\Driver\Command($collstats));    $response = $cursor->toArray()[0];    var_dump($response);} catch(MongoDB\Driver\Exception $e) {    echo $e->getMessage(), "\n";    exit;}?>

以上例程会输出：

object(MongoDB\Driver\Command)#3 (1) {
  ["command"]=>
  array(3) {
    ["create"]=>
    string(16) "cappedCollection"
    ["capped"]=>
    bool(true)
    ["size"]=>
    int(65536)
  }
}
array(1) {
  ["ok"]=>
  float(1)
}
array(16) {
  ["ns"]=>
  string(29) "databaseName.cappedCollection"
  ["count"]=>
  int(0)
  ["size"]=>
  int(0)
  ["numExtents"]=>
  int(1)
  ["storageSize"]=>
  int(65536)
  ["nindexes"]=>
  int(1)
  ["lastExtentSize"]=>
  float(65536)
  ["paddingFactor"]=>
  float(1)
  ["paddingFactorNote"]=>
  string(101) "paddingFactor is unused and unmaintained in 2.8. It remains hard coded to 1.0 for compatibility only."
  ["userFlags"]=>
  int(0)
  ["capped"]=>
  bool(true)
  ["max"]=>
  int(9223372036854775807)
  ["maxSize"]=>
  int(65536)
  ["totalIndexSize"]=>
  int(8176)
  ["indexSizes"]=>
  object(stdClass)#4 (1) {
    ["_id_"]=>
    int(8176)
  }
  ["ok"]=>
  float(1)
}

Table of Contents

• MongoDB\Driver\Command::__construct — Create a new Command