sql server 存储过程的异常处理

Create proc sp_Insert_Course
     @No char(10),
     @Name varchar(20),
     @Comment varchar(50),
     @rtn int output
 as
     begin try
         insert into Course values(@No,@Name,@Comment)
         set @rtn=1
     end try
     begin catch
         set @rtn=@@ERROR
        
         --辅助信息
         --select ERROR_LINE() as Line,
         --    ERROR_MESSAGE() as message1,
         --    ERROR_NUMBER() as number,
         --    ERROR_PROCEDURE() as proc1,
         --    ERROR_SEVERITY() as severity,
         --    ERROR_STATE() as state1
     end catch
 

declare
    @rtn int
exec sp_Insert_Course '114','语文','',@rtn output
print @rtn