Can't properly display data in tableView in JavaFX - database

Question

I was trying to add data to my tableView in my JavaFX app. I am using hibernate to do operations on my Database. I used a query to get all the orders and store each order in an object and added the object to the observable list of the tableView. I created the orders class and mapped it to my database. This is the class of the orders:
#Entity
#Table(name = "orders")
public class orders implements Serializable {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "order_id")
private int order_id;
#JoinColumn(name = "item_id")
#ManyToOne
#NotNull
private items item_id;
#Column(name = "quantity")
#NotNull
private int quantity;
#Column(name = "price_per_unit")
#NotNull
private double price_per_unit;
#Column(name = "total_price")
#NotNull
private double total_price;
#Column(name = "order_date")
#NotNull
private Date order_date;
#JoinColumn(name = "user_id")
#ManyToOne
#NotNull
private users user_id;
public orders() {
}
public orders(int order_id, items item_id, int quantity, double price_per_unit, double total_price, Date order_date, users user_id) {
this.order_id = order_id;
this.item_id = item_id;
this.quantity = quantity;
this.price_per_unit = price_per_unit;
this.total_price = total_price;
this.order_date = order_date;
this.user_id = user_id;
}
public int getOrder_id() {
return order_id;
}
public void setOrder_id(int order_id) {
this.order_id = order_id;
}
public items getItem_id() {
return item_id;
}
public void setItem_id(items item_id) {
this.item_id = item_id;
}
public int getQuantity() {
return quantity;
}
public void setQuantity(int quantity) {
this.quantity = quantity;
}
public double getPrice_per_unit() {
return price_per_unit;
}
public void setPrice_per_unit(double price_per_unit) {
this.price_per_unit = price_per_unit;
}
public double getTotal_price() {
return total_price;
}
public void setTotal_price(double total_price) {
this.total_price = total_price;
}
public Date getOrder_date() {
return order_date;
}
public void setOrder_date(Date order_date) {
this.order_date = order_date;
}
public users getUser_id() {
return user_id;
}
public void setUser_id(users user_id) {
this.user_id = user_id;
}
}
And the below code is the code of the view in which I have the tableView that loads the orders and displays the orders from the database:
public class OrdersPageController implements Initializable {
private Main app;
private Session session;
private Transaction transaction = null;
#FXML
private TableView<orders> table;
public void setApp(Main app) {
this.app = app;
}
/**
* Initializes the controller class.
*/
#Override
public void initialize(URL url, ResourceBundle rb) {
session = HibernateUtil.getSessionFactory().openSession();
transaction = session.beginTransaction();
//Fill the table view
getOrders();
}
public void goBack(ActionEvent event){
session.close();
transaction = null;
app.goToHomePage();
}
public void processLogout(ActionEvent event){
session.close();
transaction = null;
app.userLogout();
}
public void addOrder(ActionEvent event){
session.close();
transaction = null;
app.addOrdersPage();
}
public void deleteOrder(ActionEvent event){
session.close();
transaction = null;
app.closeOrdersPage();
}
public void getOrders(){
try{
String hql = "FROM orders";
Query query = session.createQuery(hql);
List<orders> list = query.getResultList();
for (orders o : list) {
//Create an order object
orders order = new orders();
order.setOrder_id(o.getOrder_id());
order.setItem_id(o.getItem_id());
order.setPrice_per_unit(o.getPrice_per_unit());
order.setQuantity(o.getQuantity());
order.setOrder_date(o.getOrder_date());
order.setTotal_price(o.getTotal_price());
order.setUser_id(o.getUser_id());
//Create an observable list for the table
ObservableList<orders> tableList = table.getItems();
//Add the order object to the list
tableList.add(order);
//Set the created list to the table to show data
table.setItems(tableList);
}
}catch(Exception e){
System.out.println(e.getMessage());
}
finally{
session.close();
}
}
}
Note that the getOrders method is the method that gets the orders from the database and sets the observable list of the tableView.
I am having problem displaying the item_id and the user_id of the order. I think the problem is that they both are objects of type items and users respectively and the table displays the address of the objects. Instead I want to display the numbers of the ids of the item ordered and the user that made the order. If you know what I can do to fix my problem please share it with me.

Answer 1

Add cellFactorys to the relevant columns. You haven't shown the FXML in the question, so I don't know the names you assigned to the appropriate TableColumn instances, but you can do something like this:
public class OrdersPageController implements Initializable {
// ...
#FXML
private TableView<orders> table;
#FXML
private TableColumn<orders, users> userColumn ;
#Override
public void initialize(URL url, ResourceBundle rb) {
userColumn.setCellFactory(tc -> new TableCell<>() {
#Override
protected void updateItem(users user, boolean empty) {
super.updateItem(user, empty);
if (empty || user == null) {
setText("");
} else {
String text = /* anything you need based on user */
setText(text);
}
}
});
session = HibernateUtil.getSessionFactory().openSession();
transaction = session.beginTransaction();
//Fill the table view
getOrders();
}
}

Answer 2

Just override toString method in users and items Classes:
Example: in your users Class ->
#Override
public String toString() {
return user_id.toString();
}
As James_D stated, have a look on java conventions. Java Classes should be always be with Capital Letter.