asp通用的防注入程序

不改变原字符显示!
如select*替换为select*
这样既不损坏数据,也安全!
没有想到的地方请大家指正

<%
Response.Write CheckRequest("str")

    ' ============================================
    ' 检测传入变量,防止SQL注入
    ' ============================================
    Function CheckRequest(ByVal strRequest)
        Dim ParaValue, aBadUalueb, bBadValue, inBad, strBad
        If strRequest = "" Then
            CheckRequest = ""
            Exit Function
        End If
        ParaValue = Request(strRequest)
        If ParaValue = "" Then
            CheckRequest = ""
            Exit Function
        End If
        aBadValue = "net user|net localgroup administrators|xp_cmdshell|/add|exec%20master.dbo.xp_cmdshell|" & Chr(0) & ""
        aValueArr = Split(aBadValue, "|")
        For a = 0 To UBound(aValueArr)
            If InStr(LCase(ParaValue), aValueArr(a)) <> 0 Then
                ParaValue = Replace(ParaValue, aValueArr(a), strFToAsc(aValueArr(a)), 1, -1, vbTextCompare)
            End If
        Next

        bBadUalue = "and|exec|insert|select|delete|update|count|chr|mid|master|truncate|char|declare|drop|from|or"
        inBad = "(|)|[|]| |*|%20"
        bValueArr = Split(bBadUalue, "|")
        iBad = Split(inBad, "|")
        For b = 0 To UBound(bValueArr)
            strBad = bValueArr(b)
            For i = 0 To UBound(iBad)
                Fstr = strBad & iBad(i)
                If InStr(LCase(ParaValue), Fstr) <> 0 Then
                    ParaValue = Replace(ParaValue, Fstr, strFToAsc(Fstr), 1, -1, vbTextCompare)
                End If
                Lstr = iBad(i) & strBad
                If InStr(LCase(ParaValue), Lstr) <> 0 Then
                    ParaValue = Replace(ParaValue, Lstr, strFToAsc(Lstr), 1, -1, vbTextCompare)
                End If
            Next
        Next

        CheckRequest = ParaValue
    End Function
    ' ============================================
    ' 首字符转换成Html码
    ' ============================================
    Function strFToAsc(ByVal strValue)
        Dim strTemp
        strTemp = strValue
        If strTemp = "" Then
            strFToAsc = ""
            Exit Function
        End If
        strTemp = "&#" & Asc(Left(strTemp, 1)) & ";" & Right(strTemp, Len(strTemp) - 1)
        strFToAsc = strTemp
    End Function
%>