Salve ragazzi sto creando una mailing listi e devo fare in modo che al momento dell'inserimento dati da parte dell'utente vi sia un controllo per vedere se quella mail è gia presente per impedire un doppio inserimento.

Ho inserito il controllo ma nulla non funziona, mi inserisce sempre il record.:

Questo è il codice:

codice:
<%
Dim rsInserisciMail
Dim rsInserisciMail_numRows

Set rsInserisciMail = Server.CreateObject("ADODB.Recordset")
rsInserisciMail.ActiveConnection = MM_mailingInfo_STRING
rsInserisciMail.Source = "SELECT * FROM mailing where mail='"& mail & "'" 
rsInserisciMail.CursorType = 0
rsInserisciMail.CursorLocation = 2
rsInserisciMail.LockType = 1
rsInserisciMail.Open()

rsInserisciMail_numRows = 0
%>
<%
' *** Edit Operations: declare variables

Dim MM_editAction
Dim MM_abortEdit
Dim MM_editQuery
Dim MM_editCmd

Dim MM_editConnection
Dim MM_editTable
Dim MM_editRedirectUrl
Dim MM_editColumn
Dim MM_recordId

Dim MM_fieldsStr
Dim MM_columnsStr
Dim MM_fields
Dim MM_columns
Dim MM_typeArray
Dim MM_formVal
Dim MM_delim
Dim MM_altVal
Dim MM_emptyVal
Dim MM_i

MM_editAction = CStr(Request.ServerVariables("SCRIPT_NAME"))
If (Request.QueryString <> "") Then
  MM_editAction = MM_editAction & "?" & Server.HTMLEncode(Request.QueryString)
End If

' boolean to abort record edit
MM_abortEdit = false

' query string to execute
MM_editQuery = ""
%>
<%
if rsInserisciMail.eof then
%> 
<%
' *** Insert Record: set variables

If (CStr(Request("MM_insert")) = "inserisciMail") Then

  MM_editConnection = MM_mailingInfo_STRING
  MM_editTable = "mailing"
  MM_editRedirectUrl = "inserimento_ok.asp"
  MM_fieldsStr  = "mail|value"
  MM_columnsStr = "mail|',none,''"

  ' create the MM_fields and MM_columns arrays
  MM_fields = Split(MM_fieldsStr, "|")
  MM_columns = Split(MM_columnsStr, "|")
  
  ' set the form values
  For MM_i = LBound(MM_fields) To UBound(MM_fields) Step 2
    MM_fields(MM_i+1) = CStr(Request.Form(MM_fields(MM_i)))
  Next

  ' append the query string to the redirect URL
  If (MM_editRedirectUrl <> "" And Request.QueryString <> "") Then
    If (InStr(1, MM_editRedirectUrl, "?", vbTextCompare) = 0 And Request.QueryString <> "") Then
      MM_editRedirectUrl = MM_editRedirectUrl & "?" & Request.QueryString
    Else
      MM_editRedirectUrl = MM_editRedirectUrl & "&" & Request.QueryString
    End If
  End If

End If
%>
<%
' *** Insert Record: construct a sql insert statement and execute it

Dim MM_tableValues
Dim MM_dbValues

If (CStr(Request("MM_insert")) <> "") Then

  ' create the sql insert statement
  MM_tableValues = ""
  MM_dbValues = ""
  For MM_i = LBound(MM_fields) To UBound(MM_fields) Step 2
    MM_formVal = MM_fields(MM_i+1)
    MM_typeArray = Split(MM_columns(MM_i+1),",")
    MM_delim = MM_typeArray(0)
    If (MM_delim = "none") Then MM_delim = ""
    MM_altVal = MM_typeArray(1)
    If (MM_altVal = "none") Then MM_altVal = ""
    MM_emptyVal = MM_typeArray(2)
    If (MM_emptyVal = "none") Then MM_emptyVal = ""
    If (MM_formVal = "") Then
      MM_formVal = MM_emptyVal
    Else
      If (MM_altVal <> "") Then
        MM_formVal = MM_altVal
      ElseIf (MM_delim = "'") Then  ' escape quotes
        MM_formVal = "'" & Replace(MM_formVal,"'","''") & "'"
      Else
        MM_formVal = MM_delim + MM_formVal + MM_delim
      End If
    End If
    If (MM_i <> LBound(MM_fields)) Then
      MM_tableValues = MM_tableValues & ","
      MM_dbValues = MM_dbValues & ","
    End If
    MM_tableValues = MM_tableValues & MM_columns(MM_i)
    MM_dbValues = MM_dbValues & MM_formVal
  Next
  MM_editQuery = "insert into " & MM_editTable & " (" & MM_tableValues & ") values (" & MM_dbValues & ")"

  If (Not MM_abortEdit) Then
    ' execute the insert
    Set MM_editCmd = Server.CreateObject("ADODB.Command")
    MM_editCmd.ActiveConnection = MM_editConnection
    MM_editCmd.CommandText = MM_editQuery
    MM_editCmd.Execute
    MM_editCmd.ActiveConnection.Close

    If (MM_editRedirectUrl <> "") Then
      Response.Redirect(MM_editRedirectUrl)
    End If
  End If

End If
%>
<%
else 
response.write "Mail già presente"
end if
%> 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Documento senza titolo</title>
<style type="text/css">
.testo {font-family: Verdana, Arial, Helvetica, sans-serif;font-size: 12px;font-weight: normal;color: #333333;}
.Stile1 {font-family: Verdana, Arial, Helvetica, sans-serif; font-size: 12px; font-weight: bold; color: #333333; }
</style>
</head>

<body>


<table width="100%" border="0" cellspacing="0" cellpadding="0">
  <tr>
    <td align="center"><table width="300" border="0" cellspacing="0" cellpadding="0">
	<tr>
        <td align="center" class="Stile1">Inserimento news letter </td>
      </tr>
      <tr>
        <td align="left"></td>
      </tr>
      <tr>
        <td align="left" class="testo"><form id="inserisciMail" name="inserisciMail" method="POST" action="<%=MM_editAction%>">
          <table width="300" border="0" cellspacing="0" cellpadding="0">
            <tr>
              <td>Email: 
                <label>
                <input name="mail" type="text" class="testo" id="mail" size="40" />
                </label></td>
            </tr>
            <tr>
              <td></td>
            </tr>
            <tr>
              <td align="center"><label>
                <input name="Submit" type="submit" class="testo" value="Inserisci mail" />
              </label></td>
            </tr>
          </table>
                
          <input type="hidden" name="MM_insert" value="inserisciMail">
</form> 
        </td>
      </tr>
      
    </table></td>
  </tr>
</table>
</body>
</html>
<%
rsInserisciMail.Close()
Set rsInserisciMail = Nothing
%>
In rosso ho evidenziato le parti che secondo me fanno da controllo e il form per l'inserimento.

Nn risco a capire perchè non mi fa il controllo.