1.第一种情况是 需要将指定的 注入字符串全部替换掉（仅替换注入的字符串为空）
复制代码 代码如下:
declare @delstr nvarchar(500)
set @delstr='<script src=//www.jb51.net/js/common.js></script>’ –这里被注入的字段串
/****************************************/
/**********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(2000)
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
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 +’]= substring([‘ + @columnname + ‘],’ + ‘1, patindex( ”%’ + @delstr + ‘%”, [‘ + @columnname + ‘])-1) + ‘ + ‘substring([‘ + @columnname + ‘], patindex( ”%’ + @delstr + ‘%”, [‘ + @columnname + ‘]) + ‘ + ‘len(”’ + @delstr + ”’) , datalength([‘ + @columnname + ‘])) 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 ‘数据库教程共有’+convert(varchar(10),@iresult)+’条记录被更新!!!’
close cur
deallocate cur
set nocount off
2.第二种是 需要将注入到表中起始位置到最后都删掉。（此种方法直接找到注入的起始位置，后面的全部删掉）
复制代码 代码如下:
–恢复被注入数据库
–2013-09-26
declare @delstr nvarchar(500)
set @delstr='</title><style>.’ –被注入的字段串的开始采样，从此位置后面的数据都为注入数据
/**********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(2000)
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
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 +’]=
substring([‘ + @columnname + ‘],1, patindex( ”%’ + @delstr + ‘%”, [‘ + @columnname + ‘])-1) 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 ‘数据库教程共有’+convert(varchar(10),@iresult)+’条记录被更新!!!’
close cur
deallocate cur
set nocount off