用于插入或更新数据库的SQL Server存储过程

Question

I am new to stored procedures and trying to learn things. I have a database table which looks likes this,

 Acc   | Room |  ID | Name |  Email | Status |  Date  | Number 
=======+======+=====+======+========+========+========+========
(null) |  101 | 001 |  ABC | (null) |   EMP  | (null) | (null) 
(null) |  102 | 002 |  DEF | (null) |   TMP  | (null) | (null)   

I am creating a stored procedure to insert or update the data in the database depending on the ID. Not all the records has data to be inserted or updated.

CREATE PROCEDURE [dbo].[uspInsertorUpdate]
    @room char(35),
    @id char(12),
    @name varchar(64),
    @status varchar(50),
AS
BEGIN
    SET NOCOUNT ON;
    IF EXISTS (SELECT null FROM emp WHERE ID = @id)
    BEGIN
       UPDATE emp 
       SET Room = @room, ID = @id, Name = @name, Status = @status
       WHERE ID = @id
    END

    INSERT INTO emp (Room, ID, Name, Status)
    VALUES(@room, @id, @name, @status);
END

Not sure if this is correct, will this create the other records with null.

Answer 1

First check if the Id exist. If it does not exist then its an insert else an update.

The body of stored proc can be:

BEGIN

declare @v_count int

select @v_count = count(ID) from emp
where ID = @id

if (@v_count = 0)
insert into emp (Room, ID, Name, Status)
values (@room, @id, @name, @status)

else
update emp
set Room = @room, Name = @name, Status = @status
where ID = @id

END