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 {

final public __construct ( array|object $document )

}

范例

Example #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  setAutoIndexId ( $bool ) {
         $this -> cmd [ "autoIndexId" ] = (bool) $bool ;
    }
    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)
}

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

The MongoDB\Driver\Command class

简介

类摘要

范例

Table of Contents