CREATE PROCEDURE INSERTCOURSEINFO
      @courseid char(10),
      @coursename varchar(30),
      @hour int,
      @returnString varchar(100) out
AS
BEGIN TRAN
     IF EXISTS( SELECT CID FROM COURSES WHERE CID=@COURSEID)
         BEGIN
              SELECT @returnString='課程信息已經存在'
              GOTO ONERROR
        END
    --新增課程信息
     INSERT INTO COURSES VALUES(@courseid,@courseName,@hour)    
     IF  @@ERROR<>0 
            BEGIN
                 SELECT @returnString='新增課程信息失敗'
                 GOTO ONERROR
            END 
 ---------錯誤處理
      SELECT @returnString='新增課程信息成功'
      COMMIT TRAN
ONERROR:
      ROLLBACK TRAN
GO