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