根据从存储过程返回的列值显示消息

Question

我想根据 table 中的数据创建 returns 不同消息的存储过程。这是我当前的存储过程的样子：

ALTER PROCEDURE [dbo].[sp_GETLIST_ACC]
    @per_id int
AS
BEGIN
    SET NOCOUNT ON;
    DECLARE @status varchar(10)
    
    SELECT @status = req_status 
    FROM TOL_FILE_REQUEST 
    WHERE per_id = @per_id

    IF @status = 'A'
    BEGIN
        SET @status = 'Approved'
    END
    ELSE IF @status = 'P'
    BEGIN
        SET @status = 'Pending'
    END

    SELECT 
        req_id,
        file_no,
        req_status,
    FROM 
        TOL_FILE_REQUEST
    WHERE 
        per_id = @per_id
END

table是这个

req_id | file_no  | req_status
-------+----------+-----------
  6    | AS000001 |    A
 10    | AS000002 |    P
 11    | AS000003 |    A
 12    | AS000004 |    A
 13    | AS000005 |    A

但是执行存储过程后，得到的结果如下：

req_id | file_no  | req_status
-------+----------+-----------
  6    | AS000001 | Approved    
 10    | AS000002 | Approved    
 11    | AS000003 | Approved
 12    | AS000004 | Approved
 13    | AS000005 | Approved

但我需要的是：

req_id | file_no  | req_status
-------+----------+-----------
  6    | AS000001 | Approved    
 10    | AS000002 | Pending
 11    | AS000003 | Approved
 12    | AS000004 | Approved
 13    | AS000005 | Approved

据我了解，req_status 跟在最新插入的数据之后。但为什么？我能做些什么来克服这个问题？我尝试使用游标和计数器进行迭代，但它执行了多次。

提前致谢！

Answer 1

用 CASE 语句在一个语句中完成所有操作。

ALTER PROCEDURE [dbo].[sp_GETLIST_ACC]
    @per_id int

AS
BEGIN

    SET NOCOUNT ON;
    SELECT req_id,
           file_no,
           CASE req_status
               WHEN 'A' THEN 'Approved'
               WHEN 'P' THEN 'Pending'
               ELSE 'Unknown'
           END as req_status
    FROM TOL_FILE_REQUEST
    WHERE per_id = @per_id
END

根据从存储过程返回的列值显示消息

Display message based on column value returned from stored procedure

sql

sql-server

stored-procedures

ssms-18