批量清除数据库所有表的所有字段中的恶意代码

declare @delStr nvarchar(500)
set @delStr='<script src=http://3bomb%2Ecom/c.js></script>'
       --delStr为你的恶意代码
/****************************************/

/**********以下为操作实体************/
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 (231,167,239,175,99,35) 为char,varchar,nchar,nvarchar,ntext,text类型
        select name from syscolumns where xtype in (231,167,239,175,35,99) and id=@tbID
open cur1
fetch next from cur1 into @columnName
while @@fetch_status=0
begin
      set @sql='update [' + @tableName + '] set ['+ @columnName +']= replace(CAST(['+@columnName+'] AS varchar(8000)),'''+@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
/*****以上为操作实体******/