MySQL 存储例程错误

Question

我现在正在 MySQL 中创建存储例程，查询时出现此错误。

SQL Error (1064): You have an error in your SQL syntax; check the manual that corresponds to your SQL server version for the right syntax to use near 'DATE_ADD(sDate, INTERVAL 1 DAY); END WHILE; END IF; END' at line 30

这是我的查询：

BEGIN
DECLARE code CHAR (5) DEFAULT (00000);
IF (SELECT COUNT(allocationDate) FROM ROOM_ALLOCATION WHERE allocationDate 
 BETWEEN startDate AND (SELECT DATE_SUB(endDate,INTERVAL 1 DAY)) > 0) THEN    
    WHILE DATEDIFF(sDate, eDate) <> 0 DO
        SET code = 0;
        WHILE code = 0 DO
            SET code =(SELECT LEFT(MD5(RAND()*100), 5));
            IF exists (SELECT * FROM BOOKING_DETAIL WHERE bDetailCode LIKE code)
            THEN 
                SET code = 0;
        END IF;
        END WHILE;
        INSERT INTO ROOM_ALLOCATION (rAllocationCode, roomID, bDetailID, allocationDate)
        VALUES
        (rAlloCode, roIDm, bDetID, sDate);
        DATE_ADD(sDate, INTERVAL 1 DAY);
    END WHILE;
END IF;
END

我很绝望，这个查询哪里出错了？

先谢谢你。

问候

Answer 1

sDate 需要声明为变量，我假设您将 startDate 传递给过程。

您将 sDate 设置为等于 startDate，现在允许您使用 DATEADD 操作 sDate。 DATEADD 返回值，它不修改变量；所以你使用 SET 并将 DATEADD 的返回值分配回 sDate 以便你的 WHILE 循环在下一个循环中使用它。

因为 eDate 不存在，我已经修改了 eDate 的实例以使用 endDate 我假设您也传入了。因为您不修改该值，所以将其重新分配给另一个变量是没有意义的。

BEGIN
DECLARE code CHAR (5) DEFAULT (00000);
DECLARE sDate DATETIME = startDate;
IF (SELECT COUNT(allocationDate) FROM ROOM_ALLOCATION WHERE allocationDate 
 BETWEEN startDate AND (SELECT DATE_SUB(endDate,INTERVAL 1 DAY)) > 0) THEN    
    WHILE DATEDIFF(sDate, endDate) <> 0 DO
        SET code = 0;
        WHILE code = 0 DO
            SET code =(SELECT LEFT(MD5(RAND()*100), 5));
            IF exists (SELECT * FROM BOOKING_DETAIL WHERE bDetailCode LIKE code)
            THEN 
                SET code = 0;
        END IF;
        END WHILE;
        INSERT INTO ROOM_ALLOCATION (rAllocationCode, roomID, bDetailID, allocationDate)
        VALUES
        (rAlloCode, roIDm, bDetID, sDate);
        SET sDate = DATE_ADD(sDate, INTERVAL 1 DAY);
    END WHILE;
END IF;
END