|
/**
* @version 1.20 1999-07-26
* @author Cay Horstmann
*/
import java.awt.Component;
import java.awt.Container;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.FileInputStream;
import java.io.IOException;
import java.sql.Connection;
import java.sql.DatabaseMetaData;
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.Properties;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class ViewDB {
public static void main(String[] args) {
JFrame frame = new ViewDBFrame();
frame.show();
}
}
class ViewDBFrame extends JFrame implements ActionListener {
public ViewDBFrame() {
setTitle("ViewDB");
setSize(300, 200);
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
Container contentPane = getContentPane();
tableNames = new JComboBox();
tableNames.addActionListener(this);
dataPanel = new JPanel();
contentPane.add(dataPanel, "Center");
nextButton = new JButton("Next");
nextButton.addActionListener(this);
JPanel p = new JPanel();
p.add(nextButton);
contentPane.add(p, "South");
fields = new ArrayList();
try {
con = getConnection();
stmt = con.createStatement();
md = con.getMetaData();
ResultSet mrs = md.getTables(null, null, null,
new String[] { "TABLE" });
while (mrs.next())
tableNames.addItem(mrs.getString(3));
mrs.close();
} catch (Exception e) {
JOptionPane.showMessageDialog(this, e);
}
contentPane.add(tableNames, "North");
}
public static Connection getConnection() throws SQLException, IOException {
Properties props = new Properties();
String fileName = "ViewDB.properties";
FileInputStream in = new FileInputStream(fileName);
props.load(in);
String drivers = props.getProperty("jdbc.drivers");
if (drivers != null)
System.setProperty("jdbc.drivers", drivers);
String url = props.getProperty("jdbc.url");
String username = props.getProperty("jdbc.username");
String password = props.getProperty("jdbc.password");
return DriverManager.getConnection(url, username, password);
}
private void add(Container p, Component c, GridBagConstraints gbc, int x,
int y, int w, int h) {
gbc.gridx = x;
gbc.gridy = y;
gbc.gridwidth = w;
gbc.gridheight = h;
p.add(c, gbc);
}
public void actionPerformed(ActionEvent evt) {
if (evt.getSource() == nextButton) {
showNextRow();
} else if (evt.getSource() == tableNames) {
remove(dataPanel);
dataPanel = new JPanel();
fields.clear();
dataPanel.setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.weighty = 100;
try {
String tableName = (String) tableNames.getSelectedItem();
if (rs != null)
rs.close();
rs = stmt.executeQuery("SELECT * FROM " + tableName);
ResultSetMetaData rsmd = rs.getMetaData();
for (int i = 1; i <= rsmd.getColumnCount(); i++) {
String columnName = rsmd.getColumnLabel(i);
int columnWidth = rsmd.getColumnDisplaySize(i);
JTextField tb = new JTextField(columnWidth);
fields.add(tb);
gbc.weightx = 0;
gbc.anchor = GridBagConstraints.EAST;
gbc.fill = GridBagConstraints.NONE;
add(dataPanel, new JLabel(columnName), gbc, 0, i - 1, 1, 1);
gbc.weightx = 100;
gbc.anchor = GridBagConstraints.WEST;
gbc.fill = GridBagConstraints.HORIZONTAL;
add(dataPanel, tb, gbc, 1, i - 1, 1, 1);
}
} catch (Exception e) {
JOptionPane.showMessageDialog(this, e);
}
getContentPane().add(dataPanel, "Center");
doLayout();
pack();
showNextRow();
}
}
public void showNextRow() {
if (rs == null)
return;
{
try {
if (rs.next()) {
for (int i = 1; i <= fields.size(); i++) {
String field = rs.getString(i);
JTextField tb = (JTextField) fields.get(i - 1);
tb.setText(field);
}
} else {
rs.close();
rs = null;
}
} catch (Exception e) {
System.out.println("Error " + e);
}
}
}
private JButton nextButton;
private JPanel dataPanel;
private JComboBox tableNames;
private ArrayList fields;
private Connection con;
private Statement stmt;
private DatabaseMetaData md;
private ResultSet rs;
}
//viewDB.properties
/*
*
* jdbc.drivers=com.pointbase.jdbc.jdbcDriver
* jdbc.url=jdbc:pointbase:corejava
* jdbc.username=PUBLIC
* jdbc.password=PUBLIC
*
*
*
*/
|