Help, need to add a delete button to my application?

Question

i have a little application that you can add numbers and friends email too
i would like to add a minus selection/entry button?
do any of you guys have any ideas?
stop();
//create a new sql connection
var conn:SQLConnection= new SQLConnection();
//add an event handeler for the open event
conn.addEventListener(SQLEvent.OPEN, openHandler);
//create the database if it doesn't exist, otherwise just opens it
var dbFile:File =File.applicationDirectory.resolvePath ("exemplu.db");
conn.openAsync(dbFile);
function openHandler(event:SQLEvent):void {
//create a new sql statement
var sql:SQLStatement=new SQLStatement();
//set the statement to connect to our database
sql.sqlConnection=conn;
//parse the sql command that creates the table if it doesn't exist
sql.text= "CREATE TABLE IF NOT EXISTS contacte(" +
"id INTEGER PRIMARY KEY AUTOINCREMENT, " +
"nume TEXT, " +
"telefon INTEGER)";
//add a new event listener to the sql when it completes creating the table
sql.addEventListener(SQLEvent.RESULT,retrieveData);
//call the execute function to execute our statement
sql.execute();
function retrieveData(event:SQLEvent = null):void {
//create a new sql statemant
var sql:SQLStatement = new SQLStatement();
sql.sqlConnection=conn;
//this sql command retrieves all the fields from our
//table in the database and orders it by name
sql.text =  "SELECT id, nume, " +
"telefon " +
"FROM contacte ORDER BY nume";
//add a new event listener if there is data
//to display it
sql.addEventListener(SQLEvent.RESULT, selectHandler);
sql.execute();
function selectHandler(event:SQLEvent):void {
//first we clear our list
lister.removeAll();
//the we create a result variable that holds
//all our contacts
var result:SQLResult=event.target.getResult();
//we check if results is not empty
if (result!=null&&result.data!=null) {
//and we add a new item to our list for
//each contact in our database
for (var i:Number = 0; i < result.data.length; i++) {
lister.addItem ({ label:result.data[i].nume + "-" +result.data[i].telefon
, nr:result.data[i].id });
plus.addEventListener(MouseEvent.CLICK,adder);
xu.addEventListener(MouseEvent.CLICK,closeapp);
back.addEventListener(MouseEvent.MOUSE_DOWN,drag);
//because my buttons are not real buttons
//but movieclips i need to set the
//buttonMode property to true
plus.buttonMode=true;
xu.buttonMode=true;
function adder(e:MouseEvent):void{
//remove the eventlistener and move to the
//next frame
plus.removeEventListener(MouseEvent.CLICK,adder);
nextFrame();
function closeapp(e:MouseEvent):void {
//close the application
NativeApplication.nativeApplication.exit();
function drag(e:MouseEvent):void {
//drag the application
this.stage.nativeWindow.startMove();
this is on the second key frame-
//this line restricts the user input
//to just numbers in the phone input box
//add a new event listener to our plus button
plus.addEventListener(MouseEvent.CLICK,adder2);
function adder2(e:MouseEvent):void {
//create a new sql statement variable
var sql:SQLStatement=new SQLStatement();
sql.sqlConnection=conn;
//the next sql command creates a new entry
//in the table contacte from our database
sql.text =  "INSERT INTO contacte(nume, " +
"telefon)" +
"VALUES(@nume, " +
"@telefon)";
//to insert variables into sql commnads
//we use the parameters definition
sql.parameters["@nume"]=nume.text;
sql.parameters["@telefon"]=tel.text;
//add a new event listener that calls the
//function that retrieves the data
sql.addEventListener(SQLEvent.RESULT,retrieveData);
sql.execute();
//go to frame no. 1
prevFrame();
//remove the eventlistener from our plus button
plus.removeEventListener(MouseEvent.CLICK,adder2);

Answer 1

use:
minus_btn.addEventListener(Event.MouseEvent,CLICK, clear)
function clear(e:MouseEvent){
var sql:SQLStatement = new SQLStatement();
sql.sqlConnection = conn;
var s:String = "DELETE from contacte WHERE nume= :numeparam AND telefon=:telefonparam";
sql.text = s;
sql.parameters[":numeparam"] = whatever;
sql.parameters[":telefonparam"] = whatever else;
//add listeners if you want
sql.execute();