Question

我在MySQL中编写SP时遇到问题。根据我在网上可以阅读的内容，以下内容应该有效，但事实并非如此。我使用Mysql v.5.1.35

CREATE DEFINER=`My_Username`@`%` PROCEDURE `ChangePassword`(IN SPusername VARCHAR(100),
    IN SPoldPassword VARCHAR(100),
    IN SPnewPassword VARCHAR(100))
BEGIN
IF EXISTS(SELECT Password_Hash 
                FROM Customer
                WHERE SPusername = Email 
                AND  SPoldPassword = Password_Hashed)
THEN
UPDATE Customer
SET Password_Hashed = SPnewPassword
END IF;
END;

Answer 1

我认为这是因为程序名称不应该在's。

在第一行中，试试这个：

CREATE DEFINER='My_Username'@'%' PROCEDURE ChangePassword(IN SPusername VARCHAR(100),

哦......还记得在UPDATE语句中查看有关WHERE子句的旁观者答案。如果不扩展WHERE子句，所有密码都会被设置为相同的东西......每一次！他建议很好！（虽然SQL语句可行）:-)

问候
Sigersted

PS：完整的查询（带分隔符和旁观者的建议）：

DELIMITER //
CREATE DEFINER='My_Username'@'%' PROCEDURE ChangePassword(
    IN SPusername VARCHAR(100),
    IN SPoldPassword VARCHAR(100),
    IN SPnewPassword VARCHAR(100))
BEGIN
IF EXISTS(SELECT Password_Hash 
          FROM Customer
          WHERE SPusername = Email 
          AND  SPoldPassword = Password_Hashed)
THEN
  UPDATE Customer
  SET Password_Hashed = SPnewPassword
  WHERE SPusername = Email 
  AND  SPoldPassword = Password_Hashed;
END IF;
END//
DELIMITER ;

Answer 2

看起来您可能会错过UPDATE语句中的IF EXISTS检查中的WHERE语句。

将其更改为

UPDATE Customer
SET Password_Hashed = SPnewPassword
WHERE SPusername = Email
AND  SPoldPassword = Password_Hashed

Mysql语法帮助

2 个答案: