Mega Code Archive
Extends AbstractTableModel (read database table to a JTable)
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import java.awt.BorderLayout;
import java.awt.GridLayout;
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.Statement;
import java.util.Vector;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextField;
import javax.swing.table.AbstractTableModel;
public class MainClass extends JFrame {
JTextField hostField;
JTextField queryField;
QueryTableModel qtm = new QueryTableModel();
public MainClass() {
setDefaultCloseOperation(EXIT_ON_CLOSE);
setSize(350, 200);
JTable table = new JTable(qtm);
JScrollPane scrollpane = new JScrollPane(table);
JPanel commandPanel = new JPanel();
commandPanel.setLayout(new GridLayout(3, 2));
commandPanel.add(new JLabel("Enter the Host URL: "));
commandPanel.add(hostField = new JTextField());
commandPanel.add(new JLabel("Enter your query: "));
commandPanel.add(queryField = new JTextField());
commandPanel.add(new JLabel("Click here to send: "));
JButton jb = new JButton("Search");
jb.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
qtm.setHostURL(hostField.getText().trim());
qtm.setQuery(queryField.getText().trim());
}
});
commandPanel.add(jb);
getContentPane().add(commandPanel, BorderLayout.NORTH);
getContentPane().add(scrollpane, BorderLayout.CENTER);
}
public static void main(String args[]) {
MainClass tt = new MainClass();
tt.setVisible(true);
}
}
class QueryTableModel extends AbstractTableModel {
Vector cache;
int colCount;
String[] headers;
Connection db;
Statement statement;
String currentURL;
public QueryTableModel() {
cache = new Vector();
}
public String getColumnName(int i) {
return headers[i];
}
public int getColumnCount() {
return colCount;
}
public int getRowCount() {
return cache.size();
}
public Object getValueAt(int row, int col) {
return ((String[]) cache.elementAt(row))[col];
}
public void setHostURL(String url) {
if (url.equals(currentURL)) {
return;
}
closeDB();
initDB(url);
currentURL = url;
}
public void setQuery(String q) {
cache = new Vector();
try {
ResultSet rs = statement.executeQuery(q);
ResultSetMetaData meta = rs.getMetaData();
colCount = meta.getColumnCount();
headers = new String[colCount];
for (int h = 1; h <= colCount; h++) {
headers[h - 1] = meta.getColumnName(h);
}
while (rs.next()) {
String[] record = new String[colCount];
for (int i = 0; i < colCount; i++) {
record[i] = rs.getString(i + 1);
}
cache.addElement(record);
}
fireTableChanged(null);
} catch (Exception e) {
cache = new Vector();
e.printStackTrace();
}
}
public void initDB(String url) {
try {
Class.forName("your driver class");
db = DriverManager.getConnection(url);
statement = db.createStatement();
} catch (Exception e) {
System.out.println("Could not initialize the database.");
e.printStackTrace();
}
}
public void closeDB() {
try {
if (statement != null) {
statement.close();
}
if (db != null) {
db.close();
}
} catch (Exception e) {
System.out.println("Could not close the current connection.");
e.printStackTrace();
}
}
}
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