0
我创建了一个连接到数据库的GUI，它显示JFrame中显示的JTable中的数据库信息，但是当使用添加数据按钮时我收到数据已添加到MySQL的消息但表不更新？在此之后，下一步是更新/删除条目并在表格中显示。更新来自MySQL的GUI中的JTable
我对Java的GUI相对较新，只是想知道我是否缺少一种方法，因为我认为populateTable();函数应该从我的populateTable();方法自动执行此操作。
这是迄今为止我已经写了一切
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.JTableHeader;
import javax.swing.table.TableColumnModel;
import net.proteanit.sql.DbUtils;
import javax.swing.JTextField;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.JComboBox;
import javax.swing.JTextPane;
public class GUI3 extends JFrame {
private static final long serialVersionUID = 1L;
// DB Code
DBHelper dbhelper = new DBHelper();
Connection con = dbhelper.open();
Statement st;
ResultSet rs;
DefaultTableModel model = new DefaultTableModel();
private JPanel contentPane;
private JTable table;
private JTextField userText;
private JTextField ageText;
private JTextField surText;
private JTextField genreText;
private JTextField hairText;
private JTextField genderText;
private JTextField firstText;
private GUI3 frame;
private final Action action = new SwingAction();
/**
* Launch the application.
*/
public void main() {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
frame = new GUI3();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
private void getUsersDataFromDB() {
try {
st = con.createStatement();
String searchQuery = "SELECT * FROM user";
rs = st.executeQuery(searchQuery);
} catch (Exception ex) {
System.out.println(ex.getMessage());
JOptionPane.showMessageDialog(null, (ex.getMessage()));
}
}
private void populateTable() {
getUsersDataFromDB();
table.setModel(DbUtils.resultSetToTableModel(rs));
JTableHeader th = table.getTableHeader();
TableColumnModel tcm = th.getColumnModel();
tcm.getColumn(0).setHeaderValue("User id");
tcm.getColumn(1).setHeaderValue("Genre");
tcm.getColumn(2).setHeaderValue("Hair Length");
tcm.getColumn(3).setHeaderValue("Name");
tcm.getColumn(4).setHeaderValue("Surname");
tcm.getColumn(5).setHeaderValue("Age");
tcm.getColumn(6).setHeaderValue("Gender");
th.repaint();
}
/**
* Create the frame.
*/
public GUI3() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 600, 426);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
JScrollPane scrollPane = new JScrollPane();
scrollPane.setBounds(17, 5, 548, 167);
userText = new JTextField();
userText.setBounds(17, 180, 70, 20);
userText.setColumns(10);
ageText = new JTextField();
ageText.setBounds(415, 180, 75, 20);
ageText.setColumns(10);
surText = new JTextField();
surText.setBounds(335, 180, 75, 20);
surText.setColumns(10);
genreText = new JTextField();
genreText.setBounds(95, 180, 75, 20);
genreText.setColumns(10);
JButton addButton = new JButton("Add");
addButton.setBounds(85, 225, 100, 25);
addButton.addActionListener(new ActionListener()
{
@Override
public void actionPerformed(ActionEvent e) {
String searchQuery = "INSERT INTO `user`(`user_id`, `genre_id`, `hair_length`, "+ "`user_fname`,`user_lname`,`user_age`,`user_gender`) " + "VALUES (?, ?, ?, ?, ?, ?, ?)";
try (PreparedStatement insert = con.prepareStatement(searchQuery)) {
insert.setString(1, userText.getText());
insert.setString(2, genreText.getText());
insert.setString(3, hairText.getText());
insert.setString(4, firstText.getText());
insert.setString(5, surText.getText());
insert.setString(6, ageText.getText());
insert.setString(7, genderText.getText());
JOptionPane.showMessageDialog(null, "Data Added To MySQL");
}catch(Exception ex){
ex.printStackTrace();
}
populateTable();
}
});
// Update Button Functionality
JButton updateButton = new JButton("Update");
updateButton.setBounds(185, 225, 100, 25);
updateButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
String searchQuery = "UPDATE user (user_id, genre_id, hair_length, " + "user_fname, user_lname, user_age, user_gender) " + "VALUES (?, ?, ?, ?, ?, ?, ?)";
try (PreparedStatement insert = con.prepareStatement(searchQuery))
{
insert.setString(1, userText.getText());
insert.setString(2, genreText.getText());
insert.setString(3, hairText.getText());
insert.setString(4, firstText.getText());
insert.setString(5, surText.getText());
insert.setString(6, ageText.getText());
insert.setString(7, genderText.getText());
JOptionPane.showMessageDialog(null, "Database Updated");
}
catch(Exception ex)
{
ex.printStackTrace();
}
populateTable();
}
});
// Delete Button Functionality
JButton deleteButton = new JButton("Delete");
deleteButton.setBounds(285, 225, 100, 25);
deleteButton.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String searchQuery = "DELETE FROM USER WHERE (user_id, genre_id, hair_length, " + "user_fname, user_lname, user_age, user_gender) " + "VALUES (?, ?, ?, ?, ?, ?, ?)";
try (PreparedStatement insert = con.prepareStatement(searchQuery)) {
insert.setString(1, userText.getText());
insert.setString(2, genreText.getText());
insert.setString(3, hairText.getText());
insert.setString(4, firstText.getText());
insert.setString(5, surText.getText());
insert.setString(6, ageText.getText());
insert.setString(7, genderText.getText());
JOptionPane.showMessageDialog(null, "Database Updated");
}catch(Exception ex){
ex.printStackTrace();
}
}
});
hairText = new JTextField();
hairText.setBounds(175, 180, 75, 20);
hairText.setColumns(10);
genderText = new JTextField();
genderText.setBounds(495, 180, 70, 20);
genderText.setColumns(10);
firstText = new JTextField();
firstText.setBounds(255, 180, 75, 20);
firstText.setColumns(10);
table = new JTable();
populateTable();
scrollPane.setViewportView(table);
contentPane.setLayout(null);
contentPane.add(firstText);
contentPane.add(scrollPane);
contentPane.add(userText);
contentPane.add(genreText);
contentPane.add(hairText);
contentPane.add(surText);
contentPane.add(ageText);
contentPane.add(genderText);
contentPane.add(addButton);
contentPane.add(updateButton);
contentPane.add(deleteButton);
JComboBox comboBox = new JComboBox();
comboBox.setBounds(35, 285, 75, 20);
contentPane.add(comboBox);
JComboBox comboBox_1 = new JComboBox();
comboBox_1.setBounds(35, 310, 75, 20);
contentPane.add(comboBox_1);
JComboBox comboBox_2 = new JComboBox();
comboBox_2.setBounds(35, 335, 75, 20);
contentPane.add(comboBox_2);
JTextPane textPane = new JTextPane();
textPane.setBounds(285, 285, 270, 75);
contentPane.add(textPane);
}
}