asp防注入代码

<%
StrTemp=request.servervariables("server_name")&request.servervariables("url")&"?"&Request.QueryString
StrTemp = LCase(StrTemp)
If Instr(StrTemp,"select%20") or Instr(StrTemp,"insert%20") or Instr(StrTemp,"delete%20from") or Instr(StrTemp,"count(") or Instr(StrTemp,"drop%20table") or Instr(StrTemp,"update%20") or Instr(StrTemp,"truncate%20") or Instr(StrTemp,"asc(") or Instr(StrTemp,"mid(") or Instr(StrTemp,"char(") or Instr(StrTemp,"xp_cmdshell") or Instr(StrTemp,"exec%20master") or Instr(StrTemp,"net%20localgroup%20administrators") or Instr(StrTemp,"net%20user") or Instr(StrTemp,"%20or%20") or Instr(StrTemp,"'") or Instr(StrTemp,"%20") or Instr(StrTemp,"""") or Instr(StrTemp,"“") or Instr(StrTemp,"”") or Instr(StrTemp,":") or Instr(StrTemp,"：") or Instr(StrTemp,";") or Instr(StrTemp,"；") or Instr(StrTemp,",") or Instr(StrTemp,"，") or Instr(StrTemp,"（") or Instr(StrTemp,"）") or Instr(StrTemp,"、") or Instr(StrTemp,"\") or Instr(StrTemp,"`") or Instr(StrTemp,"^") or Instr(StrTemp,"*") or Instr(StrTemp,"~") or Instr(StrTemp,"-") or Instr(StrTemp,"%27") then
Response.Write "<script language='javascript'>alert('对不起，不可以包含非法字符！');history.back();</script>"
Response.end
End If
%>