Mysql存儲過程問題

Question

創建以下過程時，我會收到此錯誤消息：

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near
'd_query;
 set d_result = execute stmt;
 deallocate prepare stmt; ' at line 15

但是檢查后我看不到錯誤。 第15行涉及“如果d_query不為null則”。

這是真正的錯誤嗎？ 還是不願意接受執行作為d_result的賦值？

任何幫助將不勝感激。

delimiter |
create procedure runtests()
begin
  declare d_test_id char(20);
  declare d_query text;
  declare d_result text;

  declare cur cursor for select test_id, query, result from datavalidator order by test_id;

  open cur;

  repeat
    fetch cur into d_test_id, d_query, d_result;

    if d_query is not null then
      prepare stmt from d_query;
      set d_result = execute stmt;
      deallocate prepare stmt;

      update datavalidator set result = d_result;
    end if;
  until done end repeat;

  close cur;
end;
|
delimiter ; |

Answer 1

“請注意，文字字符串表達式或用戶變量是指定要准備的語句的唯一方法。”，來自本文檔 。

在嘗試進行准備之前，嘗試將值寫入用戶變量，例如：

set @q_sql = d_query;

...或直接在fetch行中寫入用戶變量。