How to populate JTable from database on button event

Question

I have a text box that allows users to put in select type queries with the idea that when they click a button the result of the select statement will be shown in a JTable. I

Answer 1

Here is my solution to your problem. I have retained your variable names though not all of them followed Java conventions. I think all you wanted was that the user would type SQL query in JTextArea and see the result of the query in a JTable.

import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.sql.Connection;
import java.sql.DriverManager;
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 javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JSplitPane;
import javax.swing.JTable;
import javax.swing.JTextArea;
import javax.swing.table.AbstractTableModel;

public class Console {
   private JFrame frame; 
   private JTextArea textAreaQuery; 
   private JTable table_ResQues;
   private JButton btnNewButton;

public static void main(String[] args) {
    EventQueue.invokeLater(new Runnable() {
        public void run() {
            try {
                Console window = new Console();
                window.frame.setVisible(true);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    });
}

public Console() {
    initialize();
}

private void initialize() {
    frame = new JFrame("SQL Query");
    frame.setBounds(100, 100, 950, 800);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    textAreaQuery = new JTextArea();
    btnNewButton = new JButton("Execute");
    table_ResQues = new JTable();

    JPanel queryPanel=new JPanel(new BorderLayout()); // holds JTextArea and JButton

    queryPanel.add(new JScrollPane(textAreaQuery), BorderLayout.CENTER);

    JPanel btnPanel = new JPanel(new FlowLayout(FlowLayout.RIGHT));
    btnPanel.add(btnNewButton);
    queryPanel.add(btnPanel, BorderLayout.SOUTH);       

    JSplitPane splitPane = new JSplitPane(JSplitPane.VERTICAL_SPLIT, queryPanel,
            new JScrollPane(table_ResQues));
    splitPane.setOneTouchExpandable(true);
    splitPane.setDividerLocation(150);
    frame.setContentPane(splitPane);        
    btnNewButton.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            /*try {
                Class.forName("com.mysql.jdbc.Driver");
            } catch (ClassNotFoundException e2) {                   
                e2.printStackTrace();
            }*/
            String connectDB = "jdbc:ucanaccess:///Users/sebastianzeki/Documents/PhysJava/Physiology.mdb;";         
            Connection conn = null;
            Statement st = null;
            try {
                conn = DriverManager.getConnection(connectDB);
                //conn = DriverManager.getConnection("jdbc:mysql://localhost/cwcx", "root", "admin");// MySQL connection
                st = conn.createStatement();
                System.out.println("Connection To Database Made");
            } catch (SQLException e1) {
                e1.printStackTrace();
            }

            String myquery = textAreaQuery.getText();
            if(myquery.endsWith(";")){
                myquery=myquery.substring(0, myquery.length()-1);
            }
            ResultSet rs = null;
            try {
                rs = st.executeQuery(myquery);
                // extract column information
                ResultSetMetaData rsmd = rs.getMetaData(); 
                int columnCount = rsmd.getColumnCount();
                List columnData = new ArrayList(columnCount);
                for (int i = 1; i <= columnCount; i++) {
                    columnData.add(rsmd.getColumnName(i));
                }
                // sql result data
                List> rowData = new ArrayList>();
                while (rs.next()) {
                    List