Question

我的表格包含3列USERID，OLDPASSWORD，NEWPASSWORD。

如果OLDPASSWORD之间存在相等，我想按NEWPASSWORD选择USERID和OLDPASSWORD列并与NEWPASSWORD和NEWPASSWORD进行比较和OLDPASSWORD，它应返回NEWPASSWORD，否则返回0（字符串）;

像这样：

ALTER PROCEDURE [dbo].[GET_PASSWORD]
(
    @USERID NVARCHAR(50)
)
AS
     SELECT OLDPASSWORD, NEWPASSWORD 
     FROM PASSWORDINFO 
     WHERE USERID = @USERID

     IF OLDPASSWORD == NEWPASSWORD 
        RETURN "0" 
     ELSE 
        RETURN NEWPASSWORD

感谢您的帮助。

Answer 1

Return关键字不适用于从表中返回值。 Return关键字用于从存储过程返回，它只能返回整数值。在这里，您可以返回执行proc的代码结果。您应该使用select语句或使用output parameter：

直接执行此操作

ALTER PROCEDURE [dbo].[GET_PASSWORD] @USERID NVARCHAR(50)
AS
    BEGIN
        SELECT  CASE WHEN OLDPASSWORD = NEWPASSWORD THEN '0'
                     ELSE NEWPASSWORD
                END AS CurrentPassword
        FROM    PASSWORDINFO
        WHERE   USERID = @USERID
    END

或者：

ALTER PROCEDURE [dbo].[GET_PASSWORD]
    @USERID NVARCHAR(50) ,
    @CurrentPassword NVARCHAR(50) OUTPUT
AS
    BEGIN
        SELECT  @CurrentPassword = CASE WHEN OLDPASSWORD = NEWPASSWORD
                                        THEN '0'
                                        ELSE NEWPASSWORD
                                   END
        FROM    PASSWORDINFO
        WHERE   USERID = @USERID
    END

Answer 2

你试过这个：

ALTER PROCEDURE [dbo].[GET_PASSWORD]
(
    @USERID NVARCHAR(50)
)
AS
BEGIN

    SELECT
        CASE
            WHEN OLDPASSWORD = NEWPASSWORD THEN '0'
            ELSE NEWPASSWORD
         END
    FROM PASSWORDINFO
    WHERE USERID = @USERID

END

Answer 3

你需要这样的东西：

   SELECT CASE WHEN OLDPASSWORD = NEWPASSWORD THEN '0' 
   ELSE NEWPASSWORD END AS Result 
   FROM PASSWORDINFO WHERE USERID = @USERID

Answer 4

ALTER PROCEDURE [dbo].[GET_PASSWORD] (@USERID NVARCHAR(50), @result VARCHAR(10) OUTPUT)
AS
BEGIN
    SELECT @result = CASE 
            WHEN OLDPASSWORD = NEWPASSWORD
                THEN '1'
            ELSE '0'
            END
    FROM PASSWORDINFO
    WHERE UserId = @USERID
END

Answer 5

使用返回值返回多个值是不可能的，其中作为输出参数，可以返回任何数据类型，并且sp可以具有多个输出参数。我总是喜欢使用输出参数而不是RETURN值。

通常，RETURN值用于指示存储过程的成功或失败，尤其是在我们处理嵌套存储过程时。返回值0，表示成功，任何非零值表示失败。

ALTER PROCEDURE [dbo].[GET_PASSWORD]
    @USERID NVARCHAR(50) ,
    @Password NVARCHAR(50) OUTPUT
AS
    BEGIN
        SELECT  @Password  = CASE WHEN OLDPASSWORD = NEWPASSWORD
                                THEN '0'
                                  ELSE NEWPASSWORD
                                END
        FROM    PASSWORDINFO
        WHERE   USERID = @USERID
    END

Answer 6

// try this
ALTER PROCEDURE [dbo].[GET_PASSWORD]
(
    @USERID NVARCHAR(50)
)
AS
    declare   @NewPassword NVARCHAR(50)
     declare   @OldPassword NVARCHAR(50)

     SELECT  @OldPassword =OLDPASSWORD, @NewPassword = NEWPASSWORD 
     FROM PASSWORDINFO 
     WHERE USERID = @USERID    

     IF @OldPassword = @NewPassword 
        RETURN "0" 
     ELSE 
        RETURN @NewPassword

存储过程通过比较2个字段返回值

6 个答案: