asp终极防范SQL注入漏洞

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), """), ">", "&gt;"), "<", "&lt;"), "&", "&"),chr(39),"&#39"),chr(32)," "),chr(13),""))
end if
end function