Okay, so this is a simple example, which creates a in-memory database, with a single table and some values.
It uses a simple custom TableModel which can be "refreshed" if the underlying data is changed.
Have a closer look at JDBC Database Access for some more details
import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.table.AbstractTableModel;
public class TestTable {
private Connection con;
public static void main(String[] args) {
new TestTable();
}
public TestTable() {
try {
Class.forName("org.h2.Driver");
String url = "jdbc:h2:mem:InMemoryTest";
con = DriverManager.getConnection(url);
createShoppingListTable();
fillShoppingListTable();
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
} catch (ClassNotFoundException | SQLException exp) {
exp.printStackTrace();
}
}
protected void createShoppingListTable() throws SQLException {
String query = "create table shoppingList (id bigint identity, item varchar(255), quantity int)";
try (Statement stmt = con.createStatement()) {
stmt.execute(query);
}
}
protected void fillShoppingListTable() throws SQLException {
String[] items = {"Bananas", "Apples", "Grapes", "Pears", "Oranges"};
Random rnd = new Random();
try (PreparedStatement ps = con.prepareStatement("insert into shoppingList (item, quantity) values (?, ?)")) {
for (String item : items) {
ps.setString(1, item);
ps.setInt(2, rnd.nextInt(100));
ps.addBatch();
}
ps.executeBatch();
}
}
public class TestPane extends JPanel {
public TestPane() {
setLayout(new BorderLayout());
TestTableModel model = new TestTableModel();
JTable table = new JTable(model);
add(new JScrollPane(table));
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
try {
model.refresh();
} catch (SQLException ex) {
ex.printStackTrace();
}
}
});
}
}
public class TestTableModel extends AbstractTableModel {
private List<ShoppingList> shoppingList = new ArrayList<>(25);
private List<String> columnNames = new ArrayList<>(25);
@Override
public int getRowCount() {
return shoppingList.size();
}
@Override
public int getColumnCount() {
return columnNames.size();
}
@Override
public String getColumnName(int column) {
return columnNames.get(column);
}
@Override
public Object getValueAt(int rowIndex, int columnIndex) {
ShoppingList rowValue = shoppingList.get(rowIndex);
Object value = null;
switch (columnIndex) {
case 0:
value = rowValue.getId();
break;
case 1:
value = rowValue.getItem();
break;
case 2:
value = rowValue.getQuanity();
break;
}
return value;
}
public void refresh() throws SQLException {
List<String> values = new ArrayList<>(25);
try (PreparedStatement ps = con.prepareStatement("select * from shoppingList")) {
try (ResultSet rs = ps.executeQuery()) {
ResultSetMetaData md = rs.getMetaData();
for (int col = 0; col < md.getColumnCount(); col++) {
values.add(md.getColumnName(col + 1));
}
while (rs.next()) {
ShoppingList list = new ShoppingList(rs.getLong(1), rs.getString(2), rs.getInt(3));
shoppingList.add(list);
}
}
} finally {
if (columnNames.size() != values.size()) {
columnNames = values;
fireTableStructureChanged();
} else {
fireTableDataChanged();
}
}
}
public class ShoppingList {
private long id;
private String item;
private int quanity;
public ShoppingList(long id, String item, int quanity) {
this.id = id;
this.item = item;
this.quanity = quanity;
}
public long getId() {
return id;
}
public String getItem() {
return item;
}
public int getQuanity() {
return quanity;
}
}
}
}
