code: function(query, data, successCallback, failureCallback) {
  			if(typeof successCallback != "function") successCallback = function(){};
  			if(typeof failureCallback != "function") failureCallback = function(){ return _throw(new jSQL_Error("0054")); };
  
  			var i, l, remaining;
  
  			if(!Array.isArray(data[0])) data = [data];
  			remaining = data.length;
  			var innerSuccessCallback = function(tx, rs) {
  				var i, l, output = [];
  				remaining = remaining - 1;
  				if (!remaining) {
  					for (i = 0, l = rs.rows.length; i < l; i = i + 1){
  						var j = rs.rows.item(i).json;
  						//j = JSON.parse(j);
  						output.push(j);
  					}
  					successCallback(output);
  				}
  			};
  			self.db.transaction(function (tx) {
  				for (i = 0, l = data.length; i < l; i = i + 1) {
  					tx.executeSql(query, data[i], innerSuccessCallback, failureCallback);
  				}
  			});
  		}
docs: private function to execute a query