Question

DROP PROCEDURE IF EXISTS raise;

CREATE PROCEDURE raise(@uld int)
DECLARE EXIT HANDLER FOR SQLEXCEPTION
BEGIN 
    SET @uld = (select ULD_ID from doctor_personal_details)
    IF(@uld = NULL) THEN
        SET MESSAGE_TEXT = ' error occurred';
END;

我在ULD_ID中有doctor_personal_details列，当ULD_ID中没有数据时，我需要显示错误消息。

Answer 1

您需要做的是检查是否存在提供uld和SIGNAL错误的记录，如果没有，例如：

BEGIN

DECLARE CNT INT;

SELECT COUNT(*) INTO CNT
FROM doctor_personal_details
WHERE ULD_ID = uld;

IF(C = 0) THEN 
  SIGNAL SQLSTATE '45000'
  SET MESSAGE_TEXT = 'No records exist with given uid';
ELSE
  SELECT 'Success' AS message;
END IF;

END

Answer 2

DROP PROCEDURE IF EXISTS raise1;

CREATE PROCEDURE raise1

（IN uld int）

BEGIN

DECLARE CNT INT;

DECLARE MESSAGE_TEXT varchar（80）;

SELECT COUNT（*）INTO CNT

FROM doctor_personal_details

在哪里ULD_ID = uld;

IF（CNT = 0）那么
SIGNAL SQLSTATE '45000'

SET MESSAGE_TEXT = 'No records exist with given uid';

ELSE
选择＆＃39;成功＆＃39; AS消息;

END IF;

END;

致电raise1（＆＃39; 3＆＃39;）;

当所选列中没有值时抛出异常（存储过程）

2 个答案: