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。 注釋：此處只去掉前后的不可見字符，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，并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
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
--關閉、釋放游標LABCLOSE: CLOSE cur_ColName
DEALLOCATE cur_ColName