def where(self, key, operator, value):
self.__store_query({"<STR_LIT:key>": key, "<STR_LIT>": operator, "<STR_LIT:value>": value})<EOL>return self<EOL>
Make where clause

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

        :@return self