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 class MongoDB\Driver\Command {
/* 方法 */
final public __construct(array|object $document, ?array $commandOptions = null)
}

示例

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

<?php
class 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;
}

?>

以上示例会输出：

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)
}

目录

发现了问题？

了解如何改进此页面 • 提交拉取请求 • 报告一个错误
＋添加备注

用户贡献的备注 2 notes

up
15
tdrpic
8 years ago
In case you're wondering how to perform a 'distinct' query:

<?php

// Sample MongoDB command:
// db.product.distinct("scent", {"prodCat": "10 oz can"})

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

$query = ['prodCat' => '10 oz can']; // your typical MongoDB query
$cmd = new MongoDB\Driver\Command([
// build the 'distinct' command
'distinct' => 'product', // specify the collection name
'key' => 'scent', // specify the field for which we want to get the distinct values
'query' => $query // criteria to filter documents
]);
$cursor = $manager->executeCommand('catalog', $cmd); // retrieve the results
$scents = current($cursor->toArray())->values; // get the distinct values as an array

var_dump($scents);

?>
up
0
jonny dot b dot 112 at gmail dot com
6 years ago
0) Read the official MongoDB documentation for understand what db commands you can use and what parameters they requires - https://docs.mongodb.com/manual/reference/command/

1) Wrong:
$cmd = new \MongoDB\Driver\Command([
'aggregate' => 'collection',
'pipeline' => ['$group' => ['_id' => null, 'count' => ['$sum' => '$total']]]
]);
because pipeline is array of objects in json words (index array of associative arrays in php words) - pipeline: [ {<stage>}, ... ]
What does it mean? It means that 'pipeline' must be like this:
[
['$group' => ['_id' => null, 'count' => ['$sum' => '$total']]], // this is {<stage>}
['$match' => [...]], // and this
...
[...] // and all of that
]
Just see https://docs.mongodb.com/manual/reference/operator/aggregation-pipeline/

2) The first pair in associative array for __construct's argument $document (if it is an array) must be a command name (e. g. 'count' => 'collectionName' or 'findAndModify' => 'collectionName'). I found this out experimentally, but you can examine source code https://github.com/mongodb/mongo-php-driver/blob/master/src/MongoDB/Command.c for understand why it happens.
＋添加备注

备份地址：http://www.lvesu.com/blog/php/class.mongodb-driver-command.php