解决数据库被挂马

如何最快速度删除？ 
" <script   src=http://3b3.org/c.js> </script> " 
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进入SQL查询分析器 
选择你的数据库 
第一步：先sql表修改所有者为dbo 
EXEC   sp_MSforeachtable   'exec   sp_changeobjectowner   ' '? ' ', ' 'dbo ' '   ' 

第二步：统一删除字段被挂的js 
declare   @delStr   nvarchar(500)   
set   @delStr= ' <script   src=http://3b3.org/c.js> </script> ' 

set   nocount   on 

declare   @tableName   nvarchar(100),@columnName   nvarchar(100),@tbID   int,@iRow   int,@iResult   int   
declare   @sql   nvarchar(500) 

set   @iResult=0   
declare   cur   cursor   for   
select   name,id   from   sysobjects   where   xtype= 'U ' 

open   cur   
fetch   next   from   cur   into   @tableName,@tbID 

while   @@fetch_status=0   
begin   
declare   cur1   cursor   for   
                --xtype   in   (231,167,239,175,35)   为char,varchar,nchar,nvarchar,text类型   
                select   name   from   syscolumns   where   xtype   in   (231,167,239,175,35)   and   id=@tbID   
open   cur1   
fetch   next   from   cur1   into   @columnName   
while   @@fetch_status=0   
begin   
            set   @sql= 'update   [ '   +   @tableName   +   ']   set   [ '+   @columnName   + ']=   replace([ '+@columnName+ '], ' ' '+@delStr+ ' ' ', ' ' ' ')   where   [ '+@columnName+ ']   like   ' '% '+@delStr+ '% ' ' '   
            exec   sp_executesql   @sql             
            set   @iRow=@@rowcount   
            set   @iResult=@iResult+@iRow   
            if   @iRow> 0   
            begin 
print   '表： '+@tableName+ ',列: '+@columnName+ '被更新 '+convert(varchar(10),@iRow)+ '条记录; '   
            end             
            fetch   next   from   cur1   into   @columnName 

end   
close   cur1   
deallocate   cur1   

fetch   next   from   cur   into   @tableName,@tbID   
end   
print   '数据库共有 '+convert(varchar(10),@iResult)+ '条记录被更新!!! ' 

close   cur   
deallocate   cur   
set   nocount   off 
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彻底杜绝SQL注入 

1.不要使用sa用户连接数据库 
2、新建一个public权限数据库用户，并用这个用户访问数据库 
3、[角色]去掉角色public对sysobjects与syscolumns对象的select访问权限 
4、[用户]用户名称-> 右键－属性－权限－在sysobjects与syscolumns上面打“×” 
5、通过以下代码检测（失败表示权限正确，如能显示出来则表明权限太高）： 
DECLARE   @T   varchar(255), 
@C   varchar(255) 
DECLARE   Table_Cursor   CURSOR   FOR 
Select   a.name,b.name   from   sysobjects   a,syscolumns   b 
where   a.id=b.id   and   a.xtype= 'u '   and   (b.xtype=99   or   b.xtype=35   or   b.xtype=231   or   b.xtype=167)   
OPEN   Table_Cursor 
FETCH   NEXT   FROM   Table_Cursor   INTO   @T,@C 
WHILE(@@FETCH_STATUS=0) 
BEGIN   print   @c 
FETCH   NEXT   FROM   Table_Cursor   INTO   @T,@C   
END 
CLOSE   Table_Cursor 
DEALLOCATE   Table_Cursor   
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