## this is the code of loginframe ##
public class Login_frame extends javax.swing.JFrame {
Connection conn = null;
ResultSet rs = null;
PreparedStatement pst = null;
public Login_frame() {
initComponents();
conn = javaconnect.ConnecrDB();
}
private void cmd_loginActionPerformed(java.awt.event.ActionEvent evt) {
String sql ="select * from userinfo where username =? and password =? ";
try{
pst = conn.prepareStatement(sql);
pst.setString(1,txt_username.getText());
pst.setString(2,txt_password.getText());
rs = pst.executeQuery();
if(rs.next()){
JOptionPane.showMessageDialog(null, "Username and Password is correct");
rs.close();
pst.close();
close();
Welcome_Screen w = new Welcome_Screen();
w.userName = this.txt_username.getText();
w.setVisible(true);
}
}catch(Exception e){
JOptionPane.showMessageDialog(null, "Invalid username or password");
}finally{
try{
rs.close();
pst.close();
}catch(Exception e){
}
}
}
private void txt_usernameActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
this.setVisible(false);
Register_frame r = new Register_frame();
r.setVisible(true);
}
public void close(){
WindowEvent winClosingEvent= new WindowEvent(this,WindowEvent.WINDOW_CLOSING);
Toolkit.getDefaultToolkit().getSystemEventQueue().postEvent(winClosingEvent);
}
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(Login_frame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(Login_frame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(Login_frame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(Login_frame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new Login_frame().setVisible(true);
}
});
}
}
this is the code of the second Jframe
public class Welcome_Screen extends javax.swing.JFrame {
static Object txt_username;
Connection conn = null;
ResultSet rs = null;
PreparedStatement pst = null;
String username="";
/**
* Creates new form Welcome_Screen
*/
public Welcome_Screen() {
initComponents();
conn = javaconnect.ConnecrDB();
Update_table();
Update_table2();
update_elements();
}
private void update_elements(){
try{
String sql ="select league from Teams where team_owner= '"+username+"' ";
pst = conn.prepareStatement(sql);
rs = pst.executeQuery();
while(rs.next())
{
String result =rs.getString("league");
league_txt.setText(result);
}
}catch(Exception e){
JOptionPane.showMessageDialog(null, e);
}finally{
try{
rs.close();
pst.close();
}catch(Exception e){
}
}
}
private void Update_table2(){
try{
String sql ="select Player,Pos,Age from user_team ";
pst = conn.prepareStatement(sql);
rs = pst.executeQuery();
myTeam.setModel(DbUtils.resultSetToTableModel(rs));
}catch(Exception e){
JOptionPane.showMessageDialog(null, e);
}finally{
try{
rs.close();
pst.close();
}catch(Exception e){
}
}
}
private void Update_table(){
try{
String sql ="select * from Teams ";
pst = conn.prepareStatement(sql);
rs = pst.executeQuery();
league_table.setModel(DbUtils.resultSetToTableModel(rs));
}catch(Exception e){
JOptionPane.showMessageDialog(null, e);
}finally{
try{
rs.close();
pst.close();
}catch(Exception e){
}
}
}
`I have a problem regarding on how to pass value from one `JFrame` to another and use it to an `sql` query.
Let's be more clear. I want to make a programm which has to JFrames. the first is a login frame. I want to take the value which the user has entered in the username textfield and use it to load a table which is unique for the each user.
More simply i want to replace the userName in this query
String sql ="select league from Teams where team_owner= '"+userName+"' ";
