SQL2005更新TEXT型字段新方法(含SQL2000)

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解答：小梁，沟沟

整理：htl258 (tony)

时间：2009-04-24

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DECLARE @t TABLE(id INT,document NVARCHAR(MAX))
INSERT @t VALUES(1,N'XX是天才啊..AAA就是天才啊..');

UPDATE @t SET
document.write(null,CHARINDEX(N'AAA',document)+LEN('AAA')-1,null);

SELECT * FROM @t;


/*
id document
----------- -----------------------------------------------------------------
1 XX是天才啊..AAA

(1 行受影响)
*/

--SQL2000

--TEXT支持SUBSTRING,PATINDEX,CHARINDEX函数
DECLARE @t TABLE(id INT,document NVARCHAR(MAX))
INSERT @t VALUES(1,N'XX是天才啊..AAA就是天才啊..');

UPDATE @t SET
document =CASE WHEN CHARINDEX('AAA',document )>0
THEN SUBSTRING(document ,1,CHARINDEX('AAA',document )+LEN('AAA')-1)
ELSE document

END
SELECT * FROM @t;
/*
id document
----------- -----------------------------------------------------------------
1 XX是天才啊..AAA

(1 行受影响)
*/