复制代码 代码如下:

declare @t varchar(255),@c varchar(255)

declare table_cursor cursor for select a.name,b.name

from sysobjects a,syscolumns b ,systypes c

where a.id=b.id and a.xtype='u' and c.name

in ('char', 'nchar', 'nvarchar', 'varchar','text','ntext'/* --这里如果你的text(ntext)类型没有超过8000(4000)长度，才可以使用*/)

declare @str varchar(500),@str2 varchar(500)

set @str='a' /*这里是你要替换的字符*/

set @str2='' /*替换后的字符*/

open table_cursor

fetch next from table_cursor

into @t,@c while(@@fetch_status=0)

begin exec('update [' + @t + '] set [' + @c + ']=replace(cast([' + @c + '] as varchar(8000)),'''+@str+''','''+ @str2 +''')')

fetch next from table_cursor

into @t,@c end close table_cursor deallocate table_cursor;

小于8000的处理

update buyok_Orderlist set Notes=replace(cast(Notes as varchar(8000)),'a','')

如果text/ntext超过8000/4000,看如下例子<没有试过>

declare @pos int

declare @len int

declare @str nvarchar(4000)

declare @des nvarchar(4000)

declare @count int

set @des ='<requested_amount+1>'--要替换成的值

set @len=len(@des)

set @str= '<requested_amount>'--要替换的字符

set @count=0--统计次数.

WHILE 1=1

BEGIN

select @pos=patINDEX('%'+@des+'%',propxmldata) - 1

from 表名

where 条件

IF @pos>=0

begin

DECLARE @ptrval binary(16)

SELECT @ptrval = TEXTPTR(字段名)

from 表名

where 条件

UPDATETEXT 表名.字段名 @ptrval @pos @len @str

set @count=@count+1

end

ELSE

break;

END

select @count