display a TableModel as a JTable

From:

thufir <hawat.thufir@gmail.com>

Newsgroups:

comp.lang.java.help

Date:

Thu, 03 Jul 2008 10:16:19 GMT

Message-ID:

<TF1bk.48588$kx.31103@pd7urf3no>

Given three classes:

View JFrame for the GUI
MyTableModel represents the data
DBDemo has db connection

In View there's:

private javax.swing.JTable db;
db.setModel(MyTableModel.getInstance());

Should DBDemo, which connects to the actual database, morph into an inner
class for MyTableModel, perhaps?

From the view, how do I make the JTable synchronize with the MyTableModel
instance? A listener of some sort?

code:

thufir@arrakis:~$
thufir@arrakis:~$ cat NetBeansProjects/ubuntu-jdbc/src/a00720398/model/
MyTableModel.java
package a00720398.model;

import javax.swing.table.*;

public class MyTableModel extends AbstractTableModel {

    private static final TableModel INSTANCE = new MyTableModel();

    private MyTableModel() {}

    public static TableModel getInstance() {
        return INSTANCE;
    }

    public int getColumnCount() {
        return 1; //dummy
    }

    public String getColumnName(int i) {
        return "foo";
    }

    public int getRowCount() {
        return 3;
    }

    public Object getValueAt(int row, int col) {
        return new Object(); //critical to fill this in
    }

}
thufir@arrakis:~$
thufir@arrakis:~$ cat NetBeansProjects/ubuntu-jdbc/src/a00720398/model/
DBDemo.java
package a00720398.model;

import java.sql.*;
import java.util.Properties;

public class DBDemo {

    private static final String DBCLASSNAME = "com.mysql.jdbc.Driver";
    private static final String CONNECTION = "jdbc:mysql://localhost/
COFFEEBREAK";

    public void db() throws ClassNotFoundException, SQLException {

        Class.forName(DBCLASSNAME);

        Properties p = new Properties();
        p.put("user", "java");
        p.put("password", "password");

        Connection c = DriverManager.getConnection(CONNECTION, p);

        Statement stmt = c.createStatement();

        stmt.executeUpdate("CREATE TABLE COFFEES " +
                "(COF_NAME VARCHAR(32), SUP_ID INTEGER, PRICE FLOAT, " +
                "SALES INTEGER, TOTAL INTEGER)");

        stmt.executeUpdate("INSERT INTO COFFEES " +
                "VALUES ('Colombian', 101, 7.99, 0, 0)");
        stmt.executeUpdate("INSERT INTO COFFEES " +
                "VALUES ('French_Roast', 49, 8.99, 0, 0)");
        stmt.executeUpdate("INSERT INTO COFFEES " +
                "VALUES ('Espresso', 150, 9.99, 0, 0)");
        stmt.executeUpdate("INSERT INTO COFFEES " +
                "VALUES ('Colombian_Decaf', 101, 8.99, 0, 0)");
        stmt.executeUpdate("INSERT INTO COFFEES " +
                "VALUES ('French_Roast_Decaf', 49, 9.99, 0, 0)");

        String query = "SELECT COF_NAME, PRICE FROM COFFEES";
        ResultSet rs = stmt.executeQuery(query);
        while (rs.next()) {
            String s = rs.getString("COF_NAME");
            float n = rs.getFloat("PRICE");
            System.out.println(s + " " + n);
        }

        String updateString = "UPDATE COFFEES " +
                "SET SALES = 75 " +
                "WHERE COF_NAME LIKE 'Colombian'";
        stmt.executeUpdate(updateString);

        c.close();
    }
}

thufir@arrakis:~$
thufir@arrakis:~$

thanks,

Thufir