PHP实现的MongoDB数据库操作类分享

class HMongodb {   

  private $mongo;  //Mongodb连接
  private $curr_db_name;
  private $curr_table_name;
  private $error;   

  public function getInstance($mongo_server, $flag=array())
  {
    static $mongodb_arr;
    if (empty($flag['tag']))
    {
      $flag['tag'] = 'default';     }
    if (isset($flag['force']) && $flag['force'] == true)
    {
      $mongo = new HMongodb($mongo_server);
      if (empty($mongodb_arr[$flag['tag']])) 
      {
 $mongodb_arr[$flag['tag']] = $mongo;
      }
      return $mongo;
    }
    else if (isset($mongodb_arr[$flag['tag']]) && is_resource($mongodb_arr[$flag['tag']]))
    {
      return $mongodb_arr[$flag['tag']];
    }
    else
    {
      $mongo = new HMongodb($mongo_server);
      $mongodb_arr[$flag['tag']] = $mongo;
      return $mongo;
    }
  }

  
  private function __construct($mongo_server, $connect=true, $auto_balance=true)
  {
   if (is_array($mongo_server))
   {
   $mongo_server_num = count($mongo_server);
   if ($mongo_server_num > 1 && $auto_balance)
   {
    $prior_server_num = rand(1, $mongo_server_num);
    $rand_keys = array_rand($mongo_server,$mongo_server_num);
    $mongo_server_str = $mongo_server[$prior_server_num-1];
    foreach ($rand_keys as $key)
    {
    if ($key != $prior_server_num - 1)
    {
     $mongo_server_str .= ',' . $mongo_server[$key];
    }
    }
   }
   else
   {
    $mongo_server_str = implode(',', $mongo_server);
   }  }
   else
   {
    $mongo_server_str = $mongo_server;
   }
   try {
    $this->mongo = new Mongo($mongo_server, array('connect'=>$connect));
   }
   catch (MongoConnectionException $e)
   {
    $this->error = $e->getMessage();
    return false;
   }
  }

  
  public function connect()
  {
    try {
      $this->mongo->connect();
      return true;
    }
    catch (MongoConnectionException $e)
    {
      $this->error = $e->getMessage();
      return false;
    }
  }   

  
  public function selectDb($dbname)
  {
    $this->curr_db_name = $dbname;
  }   

  
  public function ensureIndex($table_name, $index, $index_param=array())
  {
    $dbname = $this->curr_db_name;
    $index_param['safe'] = 1;
    try {
      $this->mongo->$dbname->$table_name->ensureIndex($index, $index_param);
      return true;
    }
    catch (MongoCursorException $e)
    {
      $this->error = $e->getMessage();
      return false;
    }
  }

  
  public function insert($table_name, $record)
  {
    $dbname = $this->curr_db_name;
    try {
      $this->mongo->$dbname->$table_name->insert($record, array('safe'=>true));
      return true;
    }
    catch (MongoCursorException $e)
    {
      $this->error = $e->getMessage();
      return false;
    }
  }   

  
  public function count($table_name)
  {
    $dbname = $this->curr_db_name;
    return $this->mongo->$dbname->$table_name->count();
  }   

  
  public function update($table_name, $condition, $newdata, $options=array())
  {
    $dbname = $this->curr_db_name;
    $options['safe'] = 1;
    if (!isset($options['multiple']))
    {
      $options['multiple'] = 0;     }
    try {
      $this->mongo->$dbname->$table_name->update($condition, $newdata, $options);
      return true;
    }
    catch (MongoCursorException $e)
    {
      $this->error = $e->getMessage();
      return false;
    }
  }   

  
  public function remove($table_name, $condition, $options=array())
  {
    $dbname = $this->curr_db_name;
    $options['safe'] = 1;
    try {
      $this->mongo->$dbname->$table_name->remove($condition, $options);
      return true;
    }
    catch (MongoCursorException $e)
    {
      $this->error = $e->getMessage();
      return false;
  }  }   

  
  public function find($table_name, $query_condition, $result_condition=array(), $fields=array())
  {
    $dbname = $this->curr_db_name;
    $cursor = $this->mongo->$dbname->$table_name->find($query_condition, $fields);
    if (!empty($result_condition['start']))
    {
      $cursor->skip($result_condition['start']);
    }
    if (!empty($result_condition['limit']))
    {
      $cursor->limit($result_condition['limit']);
    }
    if (!empty($result_condition['sort']))
    {
      $cursor->sort($result_condition['sort']);
    }
    $result = array();
    try {
      while ($cursor->hasNext())
      {
 $result[] = $cursor->getNext();
      }
    }
    catch (MongoConnectionException $e)
    {
      $this->error = $e->getMessage();
      return false;
    }
    catch (MongoCursorTimeoutException $e)
    {
      $this->error = $e->getMessage();
      return false;
    }
    return $result;
  }   

  
  public function findOne($table_name, $condition, $fields=array())
  {
    $dbname = $this->curr_db_name;
    return $this->mongo->$dbname->$table_name->findOne($condition, $fields);
  }   

  
  public function getError()
  {
    return $this->error;
  }

  

}