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=http://www.111cn.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