asp-classic - 従来の ASP を使用して MS Access データベースの既存のフィールドを更新する

Question

新しいエントリを作成する代わりに、データベース内の既存のデータを更新するために変更する必要がある、動作する ASP コードが与えられました。INSERT INTO ステートメントを UPDATE に交換する必要があると思いますが、コードが少し複雑すぎて、どこを何を変更すればよいかわかりません。ここに来ます：

// *** Edit Operations: declare variables

// set the form action variable
var MM_editAction = Request.ServerVariables("SCRIPT_NAME");
if (Request.QueryString) {
MM_editAction += "?" + Server.HTMLEncode(Request.QueryString);
}

// boolean to abort record edit
var MM_abortEdit = false;


// query string to execute
var MM_editQuery = "";

// *** Insert Record: set variables

if (String(Request("MM_insert")) == "AddRecord") {

  var MM_editConnection = MM_PhoneWeb_conn_STRING;
  var MM_editTable  = "Employees";
  var MM_editRedirectUrl = "userRegister.asp";
  var MM_fieldsStr =     "textSurname|value|textFirstname|value|textUsername|value|textPass|value";
  var MM_columnsStr =     "Surname|',none,''|FirstName|',none,''|Username|',none,''|Password|',none,''";

  // create the MM_fields and MM_columns arrays
  var MM_fields = MM_fieldsStr.split("|");
  var MM_columns = MM_columnsStr.split("|");

  // set the form values
  for (var i=0; i+1 < MM_fields.length; i+=2) {
    MM_fields[i+1] = String(Request.Form(MM_fields[i]));
  }

  // append the query string to the redirect URL
  if (MM_editRedirectUrl && Request.QueryString && Request.QueryString.Count > 0) {
    MM_editRedirectUrl += ((MM_editRedirectUrl.indexOf('?') == -1)?"?":"&") +     Request.QueryString;
  }
}

// *** Insert Record: construct a sql insert statement and execute it

if (String(Request("MM_insert")) != "undefined") {

  // create the sql insert statement
  var MM_tableValues = "", MM_dbValues = "";
  for (var i=0; i+1 < MM_fields.length; i+=2) {
    var formVal = MM_fields[i+1];
    var MM_typesArray = MM_columns[i+1].split(",");
    var delim =    (MM_typesArray[0] != "none") ? MM_typesArray[0] : "";
    var altVal =   (MM_typesArray[1] != "none") ? MM_typesArray[1] : "";
    var emptyVal = (MM_typesArray[2] != "none") ? MM_typesArray[2] : "";
    if (formVal == "" || formVal == "undefined") {
      formVal = emptyVal;
    } else {
      if (altVal != "") {
        formVal = altVal;
      } else if (delim == "'") { // escape quotes
        formVal = "'" + formVal.replace(/'/g,"''") + "'";
      } else {
        formVal = delim + formVal + delim;
      }
    }
    MM_tableValues += ((i != 0) ? "," : "") + MM_columns[i];
    MM_dbValues += ((i != 0) ? "," : "") + formVal;
  }
  MM_editQuery = "insert into " + MM_editTable + " (" + MM_tableValues + ") values (" +     MM_dbValues + ")";


  if (!MM_abortEdit) {
    // execute the insert

    var 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) {
      Response.Redirect(MM_editRedirectUrl);