Stored procedures SQL存储过程帮助

我正在努力实现：

一种存储过程，它至少接受一个参数，并根据参数中传递的值更新一个或多个记录。作为同一事务的一部分发出的两个更新命令。一种错误处理程序，在事务发生错误时执行

使用此存储过程：

DROP PROCEDURE uspPatByState;
GO

CREATE PROCEDURE uspPatByState
     (@St varchar (2),  @state varchar (2) OUTPUT)
AS
BEGIN
    SELECT *
    FROM PATIENTS
    WHERE STATE = @St;

    IF @St IS NOT NULL
        SET @St = @state;

    UPDATE PATIENTS
    SET City = 'Los Angeles' 
    WHERE City = 'Honolulu'

    UPDATE PATIENTS
    SET ZipCode = '96801'
    WHERE ZipCode = '55555'

    SELECT *
    FROM PATIENTS
    WHERE STATE = @state        

    RETURN
END
GO

EXEC  uspPatByState  @St = 'CA' , @state= 'HI'

但它不起作用。我得到：

Address1    Address2    City    State   ZipCode
1831 Universal Ave  NULL    Los Angeles CA  55555
1831 Universal Ave  NULL    Los Angeles CA  55555

我需要看到的是：

Address1      Address2  City    State   ZipCode
1831 Universal Ave  NULL    Honolulu    HI  96801
1831 Universal Ave  NULL    Honolulu    HI  96801

---

我不太明白你想要什么样的逻辑，或者你想要做什么。但以下是我将如何使用事务和错误处理：

USE mydb;
DROP PROCEDURE uspPatByState;

GO

CREATE PROCEDURE uspPatByState
 (@St varchar (2),  @state varchar (2) OUTPUT)

AS
BEGIN
   BEGIN TRY
         BEGIN TRANSACTION
        IF(SELECT COUNT(*) FROM PATIENTS WHERE [state] = @st)
        BEGIN 
             UPDATE PATIENTS
                SET City =  'Los Angeles' 
                 WHERE City =  'Honolulu'

               UPDATE PATIENTS
                 SET ZipCode = '96801'
                    WHERE ZipCode = '55555'
        END ELSE 
        BEGIN 
          SET @state = @st
        END 
        SELECT * FROM PATIENTS WHERE STATE = @st 
         COMMIT TRANSACTION;
   END TRY
   BEGIN CATCH
         ROLLBACK TRANSACTION;
         SELECT ERROR_MESSAGE() AS ErrorMessage;
   END CATCH;
RETURN
END

GO

EXEC  uspPatByState  @St = 'CA' , @state= 'HI'

---

你想要什么样的逻辑？