小编joc*_*cki的帖子

这是我的代码:

import javax.swing.*;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
import javax.swing.text.Document;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class Frame extends JFrame {

    private JTextField txt1 = new JTextField(10);
    private JTextField txt2 = new JTextField(10);
    private JButton btn = new JButton("Set Text");

    public Frame() {
        super("Latihan");
        setLayout(new FlowLayout());
        btn.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                txt1.setText("TEST"); txt2.setText("TEST2");
            }
        });

        txt1.getDocument().addDocumentListener(new TheDocumentListener("txt1"));
        txt2.getDocument().addDocumentListener(new TheDocumentListener("txt2"));

        add(txt1);
        add(txt2);
        add(btn);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        pack();
        setVisible(true);
    }

    public static void main (String[] args) {
        SwingUtilities.invokeLater(new Runnable() { …

我的项目中有以下映射：

@Embeddable
class LineItem {
    ...
}

@Entity
abstract class Invoice {
    ...
    @ElementCollection @OrderColumn @NotEmpty
    List<LineItem> lineItems = []
    ...
}

@Entity
class PurchaseInvoice extends Invoice {
    ...
    @OneToOne(cascade=CascadeType.ALL, orphanRemoval=true)
    Payment payment
    ...
}

@Entity
class Payment {
    ...
    @ElementCollection @OrderColumn
    List<PaymentTerm> paymentTerms = []
    ...
}

@Embeddable
class PaymentTerm {
    ...
}

默认情况下，所有集合关联都是惰性的。我的目标是创建一个可用于急切加载PurchaseInvoice.lineItems和的实体图PurchaseInvoice.payment.paymentTerms。

如果我定义以下实体图：

@NamedEntityGraph(name='PurchaseInvoiceWithDetail', attributeNodes = [
     @NamedAttributeNode(value='payment', subgraph='payment'),
     @NamedAttributeNode(value='lineItems')
], subgraphs = [
     @NamedSubgraph(name='payment', type=Payment, attributeNodes = [
         @NamedAttributeNode(value='paymentTerms')
     ])
])
@Entity …