def where(self, key, operator, value):
        """Make where clause

        :@param key
        :@param operator
        :@param value
        :@type key,operator,value: string

        :@return self
        """
        self.__store_query({"key": key, "operator": operator, "value": value})
        return self
Make where clause

        :@param key
        :@param operator
        :@param value
        :@type key,operator,value: string

        :@return self