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=https://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