以下的实例为去除指定表中数据类型是VARCHAR,CHAR,NVARCHAR的字段值中的不可见字符。 注释:此处只去掉前后的不可见字符,不包括中间的字符,而且没有区分中文。

在使用前需要指定对应要修改的表名,并且需要在对应数据库下执行;

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
–定义游标取出指定表内的数据类型是VARCHAR,char,nVARCHAR的字段名称
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
–打开游标
OPEN cur_ColName
FETCH NEXT FROM cur_ColName INTO @ColName
IF @@FETCH_STATUS<>0
BEGIN
PRINT ‘没有对应表或字段,
‘PRINT ‘请确认当前数据库内有’ + @TblName + ‘表,
‘ PRINT ‘或该表内有VARCHAR、CHAR、NVARCHAR、NCHAR类型的字段!
‘ GOTO LABCLOSE
END–循环修改
WHILE @@FETCH_STATUS=0
BEGIN
–拼修改字符串
–去掉左边的不可见字符
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
–去掉右边的不可见字符 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
–关闭、释放游标LABCLOSE: CLOSE cur_ColName
DEALLOCATE cur_ColName

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