sql注入数据库修复的两种实例方法

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）

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）

--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