SQL函数递归取树状结构

表结构：
USE [Test]
GO
/****** 对象:  Table [dbo].[PersonTree]    脚本日期: 09/25/2009 00:17:44 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
SET ANSI_PADDING ON
GO
CREATE TABLE [dbo].[PersonTree](
 [ID] [int] IDENTITY(1,1) NOT NULL,
 [PName] [varchar](50) COLLATE Chinese_PRC_CI_AS NULL,
 [ParentID] [int] NULL
) ON [PRIMARY]

GO
SET ANSI_PADDING OFF

SQL函数：

CREATE FUNCTION dbo.getPerson(@personID INT)
RETURNS @table TABLE(id INT, pname VARCHAR(50))
AS
BEGIN 
 --INSERT INTO @table SELECT id, pname FROM PersonTree WHERE parentid = @personID 
 DECLARE @id INT
 DECLARE @pname VARCHAR(50)
 DECLARE myCursor CURSOR FOR
  SELECT id, pname FROM PersonTree WHERE parentid = @personID 
 OPEN myCursor
 FETCH NEXT FROM myCursor INTO @id, @pname;
 WHILE @@FETCH_STATUS = 0
 BEGIN 
  INSERT INTO @table VALUES(@id,@pname);
  INSERT INTO @table SELECT * FROM dbo.getPerson(@id);
  FETCH NEXT FROM myCursor INTO @id, @pname;
 END
 
 CLOSE myCursor
 DEALLOCATE myCursor
 
 RETURN
END