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怎樣在SQL Server中去除表中不可見(jiàn)字符 時(shí)間：2015-06-28 00:00:00 來(lái)源：IT貓撲網(wǎng) 作者：網(wǎng)管聯(lián)盟 我要評(píng)論(0)

以下的實(shí)例為去除指定表中數(shù)據(jù)類型是VARCHAR,CHAR,NVARCHAR的字段值中的不可見(jiàn)字符。注釋：此處只去掉前后的不可見(jiàn)字符，不包括中間的字符，而且沒(méi)有區(qū)分中文。

在使用前需要指定對(duì)應(yīng)要修改的表名，并且需要在對(duì)應(yīng)數(shù)據(jù)庫(kù)下執(zhí)行；

SET NOCOUNT ON
DECLARE @TblName? VARCHAR(100)
DECLARE @UpdateString NVARCHAR(1000)
DECLARE @SelectString NVARCHAR(1000)
DECLARE @COlName VARCHAR(100)
DECLARE @COUNT? INT
SET @TblName = 'YOURTABLENAME'--指定想要修改的表名
--定義游標(biāo)取出指定表內(nèi)的數(shù)據(jù)類型是VARCHAR,char,nVARCHAR的字段名稱
DECLARE cur_ColName? CURSOR
FOR
SELECT col.name
FROM syscolumns AS col
inner join sysobjects? AS obj? ON col.ID = obj.ID
INNER join systypes? AS typ? ON col.xtype = typ.xtype
WHERE obj.xtype ='U'
AND obj.name = @TblName
AND typ.name IN ('VARCHAR','CHAR','NVARCHAR','NCHAR')
FOR READ ONLY
--打開(kāi)游標(biāo)
OPEN cur_ColName
FETCH NEXT FROM cur_ColName INTO @ColName
IF @@FETCH_STATUS<>0
BEGIN
PRINT '沒(méi)有對(duì)應(yīng)表或字段，
'PRINT '請(qǐng)確認(rèn)當(dāng)前數(shù)據(jù)庫(kù)內(nèi)有' + @TblName + '表，
' PRINT '或該表內(nèi)有VARCHAR、CHAR、NVARCHAR、NCHAR類型的字段！
' GOTO LABCLOSE
END--循環(huán)修改
WHILE @@FETCH_STATUS=0
BEGIN
--拼修改字符串
--去掉左邊的不可見(jiàn)字符
SET @SelectString = 'SELECT @COU=COUNT(*)????
FROM ' + @TblName +'???
WHERE ASCII(LEFT(' + @ColName +',1))<32
AND '+ @ColName + ' IS NOT NULL'
EXEC sp_executesql @SelectString,N'@COU INT OUTPUT',
@COUNT OUTPUT WHILE @COUNT>0
BEGIN?
SET @UpdateString =??
' UPDATE ' + @TblName +??
' SET ' + @ColName + '=RIGHT(' + @ColName + ',LEN(' + @ColName + ')-1)???
WHERE ASCII(LEFT(' + @ColName + ',1))<32???
AND ' + @ColName + ' IS NOT NULL'?
EXEC sp_executesql @UpdateString?
EXEC sp_executesql @SelectString,N'@COU INT OUTPUT',@COUNT OUTPUT
END
--去掉右邊的不可見(jiàn)字符 SET @SelectString = 'SELECT @COU=COUNT(*)????
FROM ' + @TblName +'???
WHERE ASCII(RIGHT(' + @ColName +',1))<32???
AND '+ @ColName + ' IS NOT NULL'
EXEC sp_executesql @SelectString,N'@COU INT OUTPUT',
@COUNT OUTPUT WHILE @COUNT>0
BEGIN?
SET @UpdateString =?? ' UPDATE ' + @TblName +?? ' SET '
+ @ColName + '=LEFT(' + @ColName + ',LEN(' + @ColName + ')-1)???
WHERE ASCII(RIGHT(' + @ColName + ',1))<32???
AND ' + @ColName + ' IS NOT NULL'?
EXEC SP_EXECUTESQL @UpdateString?
EXEC sp_executesql @SelectString,N'@COU INT OUTPUT',
@COUNT OUTPUT
END
PRINT 'column: ' + @ColName + '－－－ok'
FETCH NEXT FROM cur_ColName INTO @ColName
END
--關(guān)閉、釋放游標(biāo)LABCLOSE: CLOSE cur_ColName?
DEALLOCATE cur_ColName

關(guān)鍵詞標(biāo)簽：SQLServer

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