怎么样通过SQL Server实现将特定字符串拆分并进行插入操作？

--循环执行添加操作
declare @idx as int
While Len(@UserList) > 0
Begin
 Set @idx = Charindex(',', @UserList);
 --只有一条数据
 If @idx = 0 and Len(@UserList) > 0
Begin
Insert Into BIS_MsgCenterInfo(ID,MsgID,UserID,[State])Values(Newid(),@ID,@UserList,0);
Break;
End
--多条数据
 If @idx > 1
Begin
Insert Into BIS_MsgCenterInfo(ID,MsgID,UserID,[State]) Values(Newid(),@ID,left(@UserList, @idx - 1),0);
Set @UserList = right(@UserList, Len(@UserList) - @idx);
End 
 Else
  Set @UserList = right(@UserList, Len(@UserList) - @idx);
End