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I have a Java class as shown below which displays my table from my database. I want to add a function that will open a pop-up menu and delete row from table. How can i do that?
import java.awt.BorderLayout;
import javax.swing.*;
import java.sql.*;
import java.util.Vector;
public class Test {
public static void main(String[] args) {
Connection con = null;
Statement st = null;
ResultSet rs = null;
String s;
try {
con = DriverManager.getConnection("jdbc:mysql://localhost/sms", "root", "");
st = con.createStatement();
s = "select * from sent_messages";
rs = st.executeQuery(s);
ResultSetMetaData rsmt = rs.getMetaData();
int c = rsmt.getColumnCount();
Vector column = new Vector(c);
for (int i = 1; i <= c; i++) {
column.add(rsmt.getColumnName(i));
}
Vector data = new Vector();
Vector row = new Vector();
while (rs.next()) {
row = new Vector(c);
for (int i = 1; i <= c; i++) {
row.add(rs.getString(i));
}
data.add(row);
}
JFrame frame = new JFrame();
frame.setSize(500, 600);
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel panel = new JPanel();
JTable table = new JTable(data, column);
JScrollPane jsp = new JScrollPane(table);
panel.setLayout(new BorderLayout());
panel.add(jsp, BorderLayout.CENTER);
frame.setContentPane(panel);
frame.setVisible(true);
} catch (Exception e) {
JOptionPane.showMessageDialog(null, "ERROR");
} finally {
try {
st.close();
rs.close();
con.close();
} catch (Exception e) {
JOptionPane.showMessageDialog(null, "ERROR CLOSE");
}
}
}
}
And as a reference i looked to this page but i couldn’t bind method from here.
Answer
I found an example and i took it as a reference.
I got to handle and rewrite the code as 3 classes shown below:
JTablePopupMenuExample.java
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.beans.Statement;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import java.util.Vector;
import javax.swing.JFrame;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JPopupMenu;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.SwingUtilities;
import javax.swing.table.DefaultTableModel;
public class JTablePopupMenuExample extends JFrame implements ActionListener {
private JTable table;
private DefaultTableModel tableModel;
private JPopupMenu popupMenu;
private JMenuItem menuItemAdd;
private JMenuItem menuItemRemove;
private JMenuItem menuItemRemoveAll;
List<SentMessagesTable> msgList;
public JTablePopupMenuExample() throws Exception{
super("JTable Popup Menu Example");
// sample table data
String[] columnNames = new String[] {"id", "receiver", "sender", "msg_text", "status", "x_date"};
msgList = new ArrayList<SentMessagesTable>();
ResultSet rs = getTableRows();
while (rs.next()) {
SentMessagesTable msg = new SentMessagesTable();
msg.setId(rs.getInt("id"));
msg.setReceiver(rs.getString("receiver"));
msg.setSender(rs.getString("sender"));
msg.setMsgText(rs.getString("msg_text"));
msg.setStatus(rs.getString("status"));
msg.setxDate(rs.getString("x_date"));
msgList.add(msg);
}
String[][] rowDataTable = new String[34400][6];
for(int i = 0 ; i < msgList.size();i++) {
//burda jtable listesini doldur
rowDataTable[i][0] = String.valueOf(msgList.get(i).getId());
rowDataTable[i][1] = msgList.get(i).getReceiver();
rowDataTable[i][2] = msgList.get(i).getSender();
rowDataTable[i][3] = msgList.get(i).getMsgText();
rowDataTable[i][4] = msgList.get(i).getStatus();
rowDataTable[i][5] = msgList.get(i).getxDate();
}
// constructs the table with sample data
tableModel = new DefaultTableModel(rowDataTable, columnNames);
table = new JTable(tableModel);
// constructs the popup menu
popupMenu = new JPopupMenu();
menuItemAdd = new JMenuItem("Add New Row");
menuItemRemove = new JMenuItem("Remove Current Row");
menuItemRemoveAll = new JMenuItem("Remove All Rows");
menuItemAdd.addActionListener(this);
menuItemRemove.addActionListener(this);
menuItemRemoveAll.addActionListener(this);
popupMenu.add(menuItemAdd);
popupMenu.add(menuItemRemove);
popupMenu.add(menuItemRemoveAll);
// sets the popup menu for the table
table.setComponentPopupMenu(popupMenu);
table.addMouseListener(new TableMouseListener(table));
// adds the table to the frame
add(new JScrollPane(table));
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(800,1000);
setLocationRelativeTo(null);
}
public static void main(String[] args){
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
try {
new JTablePopupMenuExample().setVisible(true);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
}
@Override
public void actionPerformed(ActionEvent event) {
JMenuItem menu = (JMenuItem) event.getSource();
if (menu == menuItemAdd) {
addNewRow();
} else if (menu == menuItemRemove) {
removeCurrentRow();
} else if (menu == menuItemRemoveAll) {
removeAllRows();
}
}
private void addNewRow() {
tableModel.addRow(new String[0]);
}
private void removeCurrentRow(){
int selectedRow = table.getSelectedRow();
tableModel.removeRow(selectedRow);
String jdbcUrl = "jdbc:mysql://localhost/sms";
String username = "root";
String password = "";
String sql = "delete from sent_messages where id = '"+msgList.get(selectedRow).getId()+"'";
// java.sql.Statement stmt = null;
try (Connection conn = DriverManager.getConnection(jdbcUrl, username, password);
java.sql.Statement stmt = conn.createStatement();) {
stmt.executeUpdate(sql);
System.out.println("Record deleted successfully");
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
private void removeAllRows() {
int rowCount = tableModel.getRowCount();
for (int i = 0; i < rowCount; i++) {
tableModel.removeRow(0);
}
}
private ResultSet getTableRows() throws SQLException {
Connection con = null;
java.sql.Statement st = null;
ResultSet rs = null;
String s;
try {
con = DriverManager.getConnection("jdbc:mysql://localhost/sms", "root", "");
st = con.createStatement();
s = "select * from sent_messages";
rs = ((java.sql.Statement) st).executeQuery(s);
}catch(Exception e) {
System.out.println(e.toString());
}
finally {
//con.close();
}
return rs;
}
}
SentMessagesTable.java which involves (getters and setters)
public class SentMessagesTable {
int id;
String receiver;
String sender;
String msgText;
String status;
String xDate;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getReceiver() {
return receiver;
}
public void setReceiver(String receiver) {
this.receiver = receiver;
}
public String getSender() {
return sender;
}
public void setSender(String sender) {
this.sender = sender;
}
public String getMsgText() {
return msgText;
}
public void setMsgText(String msgText) {
this.msgText = msgText;
}
public String getStatus() {
return status;
}
public void setStatus(String status) {
this.status = status;
}
public String getxDate() {
return xDate;
}
public void setxDate(String xDate) {
this.xDate = xDate;
}
}
And TableMouse Listener.java
import java.awt.Point;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JTable;
public class TableMouseListener extends MouseAdapter {
private JTable table;
public TableMouseListener(JTable table) {
this.table = table;
}
@Override
public void mousePressed(MouseEvent event) {
// selects the row at which point the mouse is clicked
Point point = event.getPoint();
int currentRow = table.rowAtPoint(point);
table.setRowSelectionInterval(currentRow, currentRow);
}
}
With that code i was able to delete records from JTable and also from my database.
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