Mysql 동적쿼리 결과값 반환

set @query_string = concat("update user_item_inventory", " set ", $update_coulmn, " = ", $update_coulmn, " - ?", " where user_key = ? and group_row_index = ? and ", $update_coulmn, " >= ", $item_count);
prepare stmt from @query_string;
 
execute stmt using @item_count, @user_key, @group_row_index;
 
if(1 > ROW_COUNT()) then
    ROLLBACK;
    SELECT 1252 as `result`;
    LEAVE proc_label;
end if;
 
deallocate prepare stmt;