怎樣在SQL Server中去除表中不可見字符

以下的實例為去除指定表中數據類型是VARCHAR,CHAR,NVARCHAR的字段值中的不可見字符。註釋：此處只去掉前後的不可見字符，不包括中間的字符，而且沒有區分中文。

在使用前需要指定對應要修改的表名，並且需要在對應數據庫下執行；

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
--定義游標取出指定表內的數據類型是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
--打開游標
OPEN cur_ColName
FETCH NEXT FROM cur_ColName INTO @ColName
IF @@FETCH_STATUS<>0
BEGIN
PRINT '沒有對應表或字段，
'PRINT '請確認當前數據庫內有' + @TblName + '表，
' PRINT '或該表內有VARCHAR、CHAR、NVARCHAR、NCHAR類型的字段！
' GOTO LABCLOSE
END--循環修改
WHILE @@FETCH_STATUS=0
BEGIN
--拼修改字符串
--去掉左邊的不可見字符(空白 32, 問號(?) 63)
SET @SelectString = 'SELECT @COU=COUNT(*)    
FROM ' + @TblName +'   
WHERE ASCII(LEFT(' + @ColName +',1))<63 
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))<63   
AND ' + @ColName + ' IS NOT NULL' 
EXEC sp_executesql @UpdateString 
EXEC sp_executesql @SelectString,N'@COU INT OUTPUT',@COUNT OUTPUT
END
--去掉右邊的不可見字符
SET @SelectString = 'SELECT @COU=COUNT(*)    
FROM ' + @TblName +'   
WHERE ASCII(RIGHT(' + @ColName +',1))<63   
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))<63   
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
--關閉、釋放游標
LABCLOSE: CLOSE cur_ColName 
DEALLOCATE cur_ColName



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