sqlserver存储过程事务回滚

set ANSI_NULLS ON
set QUOTED_IDENTIFIER ON
go

ALTER PROCEDURE [dbo].[AddUserOnChannel]
@UserName varchar(50),
@Password varchar(50),
@ChannelID int,
@Lock bit,
@Remark text,
@rtn int output--1成功-1失败
AS
BEGIN
        declare @UserID int
        declare @tran varchar(50)
        set @rtn=-1;
        set @tran=''
begin tran  @tran
            begin try
--插入用户信息
                 insert into [User]
                (UserName,Password,Remark,Lock)
                values
                (
                @UserName,
                @Password,
                @Remark,
                @Lock
                 );
--查找用户ID
                select @UserID=ID from [User] where userName=@UserName;
--插入UserChannel表数据
                insert into UserChannel
                (
                UserID,
                ChannelID
                )
                values
                (
                @UserID,
                @ChannelID
                )
               set @rtn=1;
           end try
           begin catch
              if @@trancount>0
                rollback tran  @tran;
           end catch
              if @@trancount>0
                commit tran  @tran;
END

感谢田老表...