[Sql Server]去除表中的不可见字符 SQL

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 CURSORFORSELECT col.nameFROM syscolumns AS col inner join sysobjects AS obj ON col.ID = obj.ID INNER join systypes AS typ ON col.xtype = typ.xtypeWHERE obj.xtype ='U'AND obj.name = @TblNameAND typ.name IN ('VARCHAR','CHAR','NVARCHAR','NCHAR')FOR READ ONLY--打开游标OPEN cur_ColNameFETCH NEXT FROM cur_ColName INTO @ColNameIF @@FETCH_STATUS<>0BEGIN 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 LABCLOSEEND--循环修改WHILE @@FETCH_STATUS=0BEGIN --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 @ColNameEND--关闭、释放游标LABCLOSE: CLOSE cur_ColName DEALLOCATE cur_ColName