SqlServer去除表中的不可见字符_[SQL Server教程]

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

--作用：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
--注意：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
--有兴趣的可以自己加个判别的中文，其实也很简单的，就是限定一个字符的范围就可以了
--日期：2004－11－04
--作者：ICERIVER
--注意：使用前请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 ONDECLARE @TblName  VARCHAR(100)
DECLARE @UpdateString NVARCHAR(1000)
DECLARE @SelectString NVARCHAR(1000)
DECLARE @COlName VARCHAR(100)
DECLARE @COUNT  INTSET @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_ColNameFETCH 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

来源：网络