docs: function NoPg(db) {
  	var self = this;
  	if(!db) { throw new TypeError("db invalid: " + util.inspect(db) ); }
  	self._db = db;
  	self._values = [];
  	self._tr_state = 'open';
  	self._stats = [];
  	self._cache = {
  		'types': {},
  		'objects': {}
  	};
  	self._events = new EventEmitter();
  }