asp简单的ajax留言板(采用三层模式)

好久没有写过asp了,这回写个留言板还真觉得有点难度,竞然写了整整一天,哈哈.
就只有留言其它的都什么也没写,采用三层结构(不知道算不算,本来对三层的概念很糊涂)

演示的留言板,希望各位大哥大姐如果发现有漏洞的话请在这里告诉我,千万不要黑我的网站,在这里小弟先谢过了.

index.asp
<%@ codepage=65001%>
<%
option explicit
%>
<% Response.Charset="utf-8"%>
<% Session.CodePage=65001 %>
<!-- #include file="AccHelper.asp" -->
<!-- #include file="Common.asp"-->
<!-- #include file="DAL_Guest.asp" -->
<!-- #include file="MOD_Guest.asp" -->
<!-- #include file="BLL_Guest.asp" -->
<%
 Dim mybll
 Dim myList
 Set mybll = new BLL_Guest
 Select Case Request("tCMD")
  Case "SAVE"
   mybll.Insert()
  Case "DEL"
   mybll.Delete()
 End Select
 myList = mybll.FindByPage()
%>
<h2>客户留言</h2>
<p>
<form>
 <textarea cols="56" rows="6" wrap="VIRTUAL"></textarea>
 <input type="button" value="提交留言" />
</form>
</p>
<%=myList%>

BLL_Guest.asp
<%
 '/// <summary>
 '/// 摘要说明。
 '/// </summary>
 Class BLL_Guest

Private mycom,mymod,mydal

Private LI,UL

Private DEL

  '获取信息
  Public Sub GetGuest()

mydal.GetGuest(Id)

End Sub

'新增信息
  Public Sub Insert()

   mymod.Content = Request("content")
   mymod.re = Request("Re")
   mymod.Addtime = Now()
   mymod.Ip = request.servervariables("HTTP_X_FORWARDED_FOR")
   If len(mymod.Ip)<=0 Then mymod.Ip = request.servervariables("REMOTE_ADDR")

Call mydal.Insert(mymod)

End Sub

'更新信息
  Public Sub Update()

Call mydal.Update(mymod)

End Sub

'删除信息
  Public Sub Delete()

mydal.Delete(Request("Id"))

End Sub

'查找信息
  Public Function FindByPage()

Dim PageSize,CurrentPage,WhereValue,OrderValue,RecordCount
   Dim objRS
   Dim tmp1,tmp2,tmp3,parms,i
   Dim tCMD
   tCMD = Request("tCMD")
   PageSize = "8"
   CurrentPage = Request("PageNo")
   If Len(CurrentPage)<=0 Then
    CurrentPage=1
   End If
   WhereValue = ""
   OrderValue = "Id"
   Set objRS = mydal.FindByPage(PageSize,CurrentPage-1,WhereValue,OrderValue)
   i = 1
   RecordCount = mydal.Count(WhereValue)
   Do While Not objRS.EOF
    If tCMD="DEL" Then
     DEL = "<a href=""https://www.jb51.net/?tCMD=DEL&Id="&objRS("Id")&""">删除</a>"
    Else
     DEL = ""
    End If
    parms=Array(i,objRS("content"),objRS("ip"),objRS("addtime"),DEL)
    tmp1 = tmp1 & mycom.Format(LI,parms)
    objRs.Movenext
    i = i + 1
   Loop
   tmp3 = mycom.Page(PageSize,CurrentPage,RecordCount,"guest/index.asp?tCMD=LIST")
   parms=Array(tmp1,tmp3)
   tmp2 = tmp2 & mycom.Format(UL,parms)

FindByPage = tmp2

End Function

Private Sub Class_Initialize()

LI = "<li><span>{0}</span> <span>{1}</span><br /><span>作者:{2}</span> <span>{3}</span> <span>{4}</span></li>" & vbCrLf
   UL = "<UL>{0}<li>{1}</li></UL>"
   DEL = ""

Set mycom = new Common
   set mymod = new MOD_Guest
   set mydal = new DAL_Guest

End Sub

Private Sub Class_Terminate()

Set mycom = Nothing
   Set mymod = Nothing
   set mydal = Nothing

End Sub

End Class
%>

DAL_Guest.asp
<%
 '/// <summary>
 '/// 摘要说明。
 '/// </summary>
 Class DAL_Guest

  Private SQL_01
  Private SQL_02
  Private SQL_03
  Private SQL_04
  Private SQL_05
  Private SQL_06
  Private SQL_07

Private mycom,myacc,mymod

'/// <summary>
  '/// 获得信息
  '/// </summary>
  '/// <param>判断字段</param>
  '/// <returns>信息体</returns>
  Public Function GetGuest(Id)