下面给出4个函数，足够你抵挡一切SQL注入漏洞！读懂代码，你就能融会贯通。
注意要对所有的request对象进行过滤：包括 request.cookie, request.ServerVariables 等等容易被忽视的对象：
function killn(byval s1) '过滤数值型参数
if not isnumeric(s1) then
killn=0
else
if s1<0 or s1>2147483647 then
killn=0
else
killn=clng(s1)
end if
end if
end function
function killc(byval s1) 过滤货币型参数
if not isnumeric(s1) then
killc=0
else
killc=formatnumber(s1,2,-1,0,0)
end if
end function
function killw(byval s1) '过滤字符型参数
if len(s1)=0 then
killw=""
else
killw=trim(replace(s1,"'",""))
end if
end function
function killbad(byval s1) 过滤所有危险字符，包括跨站脚本
If len(s1) = 0 then
killbad=""
else
killbad = trim(replace(replace(replace(replace(replace(replace(replace(replace(s1,Chr(10), "<br>"), Chr(34), """), ">", ">"), "<", "<"), "&", "&"),chr(39),"'"),chr(32)," "),chr(13),""))
end if
end function
