I want to insert values from jtextfields into my database. but following error is occured.. Access denied for user ''#'localhost' to database 'employee' any solution?
import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
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.Vector;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextField;
public class DataEntry implements ActionListener{
Connection conn = null;
Statement stmt = null;
// Database credentials
//Create and set up the window.
JFrame mainframe=new JFrame("Database Operation");
JPanel mainpanel=new JPanel();
JButton insertbtn=new JButton("Insert");
JButton viewbtn=new JButton("View");
JLabel label1=new JLabel("ID: ");
JLabel label2=new JLabel("Age: ");
JLabel label3=new JLabel("");
JFrame insertframe=new JFrame("Insert into Database");
JPanel insertpanel=new JPanel();
JLabel idlabel=new JLabel(" id");
JTextField idtext=new JTextField(20);
JLabel agelabel=new JLabel(" age");
JTextField agetext=new JTextField(20);
JButton insertsubmit=new JButton("Submit");
JFrame viewframe=new JFrame("View Database Data");
JPanel viewpanel=new JPanel();
Vector datacol=new Vector();
Vector datarow=new Vector();
JTable datatable;
JScrollPane viewdata;
public void init()
{
mainwindow();
}
public void mainwindow()
{
mainpanel.setBackground(Color.GRAY);
mainpanel.setLayout(null);
insertbtn.setBounds(300, 300, 100, 30);
viewbtn.setBounds(800, 300, 100, 30);
mainpanel.add(insertbtn);
mainframe.add(mainpanel);
mainframe.setSize(1350, 700);
mainframe.setVisible(true);
insertbtn.addActionListener(this); }
public void insertwindow()
{
insertpanel.setBackground(Color.GRAY);
idlabel.setForeground(Color.WHITE);
agelabel.setForeground(Color.WHITE);
insertpanel.setLayout(null);
idlabel.setBounds(400, 150, 100, 20);
idtext.setBounds(550, 150, 150, 30);
agelabel.setBounds(400, 200, 100, 20);
agetext.setBounds(550, 200, 150, 30);
insertsubmit.setBounds(490, 300, 100, 30);
insertpanel.add(idlabel);
insertpanel.add(idtext);
insertpanel.add(agelabel);
insertpanel.add(agetext);
insertpanel.add(insertsubmit);
insertframe.add(insertpanel);
insertframe.setSize(1350, 700);
insertframe.setVisible(true);
insertsubmit.addActionListener(this);
insertframe.addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
mainframe.setVisible(true);
}
}
);
}
public void viewwindow()
{
datacol.removeAllElements();
datarow.removeAllElements();
OpenDatabase();
try
{
Statement st=conn.createStatement();
ResultSet rs=st.executeQuery("select id,age from employee");
ResultSetMetaData rms=rs.getMetaData();
int cols=rms.getColumnCount();
for(int i=1;i<=cols;i++)
{
datacol.addElement(rms.getColumnName(i));
}
while(rs.next())
{
Vector row=new Vector(cols);
for(int i=1;i<=cols;i++)
{
row.addElement(rs.getObject(i));
}
datarow.addElement(row);
}
datatable=new JTable(datarow,datacol);
viewdata=new JScrollPane(datatable);
}
catch(Exception e)
{
JOptionPane.showConfirmDialog(null, "Problem in Database connectivity or Data", "Result", JOptionPane.DEFAULT_OPTION,JOptionPane.WARNING_MESSAGE);
}
viewpanel.setBackground(Color.GRAY);
viewpanel.setLayout(null);
viewdata.setBounds(20, 50, 1250, 600);
viewpanel.add(viewdata);
viewframe.add(viewpanel);
viewframe.setSize(1350, 700);
viewframe.setVisible(true);
viewframe.addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
mainframe.setVisible(true);
}
});}
public void insertdata(String id, String age)
{
try
{
Statement st=conn.createStatement();
st.executeUpdate("insert into employee values("+id+",'"+age+")");
JOptionPane.showConfirmDialog(null, "Your Data Has been Inserted", "Result", JOptionPane.DEFAULT_OPTION,JOptionPane.PLAIN_MESSAGE);
}
catch(Exception e)
{
JOptionPane.showConfirmDialog(null, "Problem in Database connectivity or Data", "Result", JOptionPane.DEFAULT_OPTION,JOptionPane.WARNING_MESSAGE);
}
}
public void OpenDatabase()
{
try
{
Class.forName("com.mysql.jdbc.Driver");
conn=DriverManager.getConnection("jdbc:mysql://localhost/employee");
}
catch(Exception e)
{
System.out.println(e);
}
}
public void CloseDatabase()
{
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}public void actionPerformed(ActionEvent arg0) {
if(arg0.getSource()==insertbtn)
{
mainframe.setVisible(false);
insertwindow();
}
if(arg0.getSource()==viewbtn)
{
mainframe.setVisible(false);
viewwindow();
}if(arg0.getSource()==insertsubmit)
{
String id=idtext.getText();
String age=agetext.getText();
try
{
OpenDatabase();
insertdata(id,age);
CloseDatabase();
}
catch(Exception e)
{
System.out.println(e);
}
idtext.setText("");
agetext.setText("");}}
public static void main(String args[])
{
DataEntry dm=new DataEntry();
dm.init();
}
}
You have problem with
conn=DriverManager.getConnection("jdbc:mysql://localhost/employee");
DriverManager.getConnection() ' parameters setting should be like
DriverManager.getConnection("jdbc:mysql://hostname:port/dbname","username", "password");
If your mysql have default settings and you use root user it should be as
conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/employee","root", "your password");
Give user id and password in getConnection method
conn=DriverManager.getConnection("jdbc:mysql://localhost/employee","root","password");
"root" as user id of my sql(As in yor system)
and "password" as password of my sql (As in yor system)
Use user name & password of your mysql database in getConnection method
conn=DriverManager.getConnection("jdbc:mysql://localhost/employee");
as
conn=DriverManager.getConnection("jdbc:mysql://localhost/employee","root","password");
Related
This question already has answers here:
What is a NullPointerException, and how do I fix it?
(12 answers)
Closed 2 years ago.
While working on a GUI project i am stuck with an error called null pointer error.
I am unable to resolve this problem.
The line which shows the error is closed by double asterisk on both sides(**).(line 80)
I have connected this with a SQL database and error erupts while assigning Jtable its value and structure.
package connectsqlite;
import java.awt.BorderLayout;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JLabel;
import java.awt.Font;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JTable;
import java.sql.*;
import javax.swing.*;
import net.proteanit.sql.DbUtils;
public class afterLogin extends JFrame {
public JPanel contentPane;
private JTable table;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
afterLogin frame = new afterLogin();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
*/
Connection connect = null;
public afterLogin() {
connect = sqliteConnection.conn();
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 695, 422);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(null);
JButton btnBack = new JButton("Log out");
btnBack.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
Connecting window = new Connecting();
window.frame.setVisible(true);
}
});
btnBack.setBounds(10, 62, 114, 23);
contentPane.add(btnBack);
JButton btnNewButton = new JButton("Load Details");
btnNewButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
try{
String query = "SELECT * FROM Appointments";
PreparedStatement pst = connect.prepareStatement(query);
ResultSet rs = pst.executeQuery();
**table.setModel(DbUtils.resultSetToTableModel(rs));**
}
catch (Exception e1) {
e1.printStackTrace();
}
}
});
btnNewButton.setBounds(10, 28, 114, 23);
contentPane.add(btnNewButton);
JScrollPane scrollPane = new JScrollPane();
scrollPane.setBounds(162, 57, 435, 305);
contentPane.add(scrollPane);
JScrollPane scrollPane_1 = new JScrollPane();
scrollPane.setViewportView(scrollPane_1);
}
}
You haven't instantiated your table, it's only declared. Therefore, when you call setModel on it it's going to cause a NullPointerException.
any help would be greatly appreciated.
I've created 2 JFrames, one is a login window which verifies user credentials and I've linked it with my website's mySQL(This works and was hard since I'm very new to Java), and the other one is my main window which contains the main user interface where the user will work from.
I am trying to find a way that when user credentials are verified, the login window closes and opens the Main window. The more I dig into this, the more I think I've built this whole thing wrong, because both JFrames are built in main methods (I though this was how you did it, every tutorial begins with a main method).
to the actionPerform I've created on the JButton or textField_Password, but that does not work at all.Any idea how to open another class from actionPerform?
I would like to open the main window once user credentials are verified. Any ideas on how to proceed. This is all new to me and any help would be greaty appreciated.
Thanks in advance to anyone who helps me with this one, because I'm kind of stuck!
I was trying to add the following:
Main window = new Main();
window.frame.setVisible();
to my Jbutton actionPerform
here is the main code, any help would be greatly appreciated as I am a little loss
import javax.swing.JFrame;
import java.awt.SystemColor;
import javax.swing.JTextField;
import javax.swing.JButton;
import javax.swing.JLabel;
import java.awt.Font;
import java.awt.GridBagLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.SwingConstants;
//import com.mysql.jdbc.Connection;
//import com.mysql.jdbc.PreparedStatement;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import javax.swing.JSeparator;
import javax.swing.JPasswordField;
import javax.swing.JCheckBox;
import java.awt.Cursor;
import java.awt.Desktop;
import java.awt.EventQueue;
import java.sql.SQLException;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
public class Login {
private JFrame frame;
private JTextField txtUsername;
private JPasswordField txtPassword;
final String signUp = ("https://www.google.com");
Connection con = null;
PreparedStatement pst = null;
ResultSet rs = null;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
try {
Login window = new Login();
window.frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the application.
*/
public Login() {
initialize();
}
/**
* Initialize the contents of the frame.
*/
private void initialize() {
frame = new JFrame();
frame.getContentPane().setBackground(Color.BLACK);
frame.setBounds(100, 100, 547, 382);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().setLayout(null);
frame.setLocationRelativeTo(null);
// frame.setUndecorated(true);
txtUsername = new JTextField();
txtUsername.addMouseListener(new MouseAdapter() {
#Override
public void mouseClicked(MouseEvent e) {
txtUsername.setText(null);
}
});
JLabel labelResponse = new JLabel("");
labelResponse.setHorizontalAlignment(SwingConstants.CENTER);
labelResponse.setFont(new Font("Dialog", Font.BOLD, 12));
labelResponse.setForeground(Color.ORANGE);
labelResponse.setBounds(122, 280, 277, 30);
frame.getContentPane().add(labelResponse);
txtUsername.setBorder(null);
txtUsername.setHorizontalAlignment(SwingConstants.CENTER);
txtUsername.setFont(new Font("Meiryo", Font.BOLD, 18));
txtUsername.setForeground(new Color(0, 128, 0));
txtUsername.setOpaque(false);
txtUsername.setText("Username");
txtUsername.setBackground(SystemColor.inactiveCaption);
txtUsername.setBounds(82, 62, 353, 53);
frame.getContentPane().add(txtUsername);
txtUsername.setColumns(10);
/*
* JLabel labelClose = new JLabel("X");
*
labelClose.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
* labelClose.addMouseListener(new MouseAdapter() {
*
* #Override public void mouseClicked(MouseEvent e) {
System.exit(0); } });
* labelClose.setFont(new Font("Tahoma", Font.BOLD, 20));
* labelClose.setForeground(new Color(102, 205, 170));
labelClose.setBounds(493,
* 11, 22, 22); frame.getContentPane().add(labelClose);
*
* JLabel labelMin = new JLabel("-");
*
labelMin.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
* labelMin.addMouseListener(new MouseAdapter() {
*
* #Override public void mouseClicked(MouseEvent arg0) {
* frame.setState(Frame.ICONIFIED); } });
labelMin.setForeground(new Color(102,
* 205, 170)); labelMin.setFont(new Font("Tahoma", Font.BOLD,
20));
* labelMin.setBounds(470, 11, 22, 22);
frame.getContentPane().add(labelMin);
*/
JLabel lblGt = new JLabel("Log In");
lblGt.setForeground(new Color(0, 128, 0));
lblGt.setFont(new Font("Meiryo", Font.BOLD, 20));
lblGt.setBounds(10, 5, 88, 38);
frame.getContentPane().add(lblGt);
JSeparator separator = new JSeparator();
separator.setBounds(82, 113, 353, 2);
frame.getContentPane().add(separator);
JSeparator separator_1 = new JSeparator();
separator_1.setBounds(82, 190, 353, 2);
frame.getContentPane().add(separator_1);
JCheckBox chckbxShowPass = new JCheckBox("Show Pass");
chckbxShowPass.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
chckbxShowPass.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent evt) {
if (chckbxShowPass.isSelected()) {
txtPassword.setEchoChar((char) 0);
} else {
txtPassword.setEchoChar('*');
}
}
});
chckbxShowPass.setBorder(null);
chckbxShowPass.setOpaque(false);
chckbxShowPass.setForeground(new Color(0, 128, 0));
chckbxShowPass.setFont(new Font("Meiryo", Font.BOLD, 14));
chckbxShowPass.setBackground(new Color(0, 128, 0));
chckbxShowPass.setBounds(409, 281, 106, 23);
frame.getContentPane().add(chckbxShowPass);
JLabel labelRegister = new JLabel("Register");
labelRegister.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
labelRegister.setForeground(new Color(0, 128, 0));
labelRegister.setFont(new Font("Meiryo", Font.BOLD, 14));
labelRegister.setBounds(10, 285, 76, 16);
frame.getContentPane().add(labelRegister);
JButton buttonLogin = new JButton("Login");
buttonLogin.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
try {
Class.forName("com.mysql.jdbc.Driver");
Connection con = (Connection)
DriverManager.getConnection(
"jdbc:mysql://localhost:3306/test", "root", "password"); // not the actual
String query = "select EmailAddress,
Password from users where EmailAddress LIKE '%"
+
txtUsername.getText() + "%'";
PreparedStatement statement =
con.prepareStatement(query);
ResultSet result =
statement.executeQuery();
if (result.next()) {
String dbasePassword =
result.getString("Password").toString().trim();
String enteredPassword = new
String(txtPassword.getText().trim());
if
(dbasePassword.equals(enteredPassword))
labelResponse.setText("User recognized");
else
labelResponse.setText("Verify credentials");
} else {
labelResponse.setText("You
must be registered to use this software.");
}
statement.close();
con.close();
} catch (SQLException se) {
se.printStackTrace();
} catch (Exception evt) {
evt.printStackTrace();
labelResponse.setText("Exception
occurred while searching in the users table");
}
}
});
txtPassword = new JPasswordField();
txtPassword.addKeyListener(new KeyAdapter() {
#Override
public void keyPressed(KeyEvent evt) {
if (evt.getKeyCode() == KeyEvent.VK_ENTER)
try {
Class.forName("com.mysql.jdbc.Driver");
Connection con = (Connection)
DriverManager.getConnection(
"jdbc:mysql://localhost:3306/test", "root",
"password");
String query = "select
EmailAddress, Password from users where EmailAddress LIKE '%"
+
txtUsername.getText() + "%'";
PreparedStatement statement =
con.prepareStatement(query);
ResultSet result =
statement.executeQuery();
if (result.next()) {
String dbasePassword =
result.getString("Password").toString().trim();
String enteredPassword
= new String(txtPassword.getText().trim());
if
(dbasePassword.equals(enteredPassword))
labelResponse.setText("User recognized");
else
labelResponse.setText("Verify credentials");
} else {
labelResponse.setText("You must be registered to use this software.");
}
statement.close();
con.close();
} catch (SQLException se) {
se.printStackTrace();
} catch (Exception evte) {
evte.printStackTrace();
labelResponse.setText("Exception occurred while searching in the users
table");
}
}
});
txtPassword.addMouseListener(new MouseAdapter() {
#Override
public void mouseClicked(MouseEvent e) {
txtPassword.setText(null);
}
});
txtPassword.setText("Password");
txtPassword.setBorder(null);
txtPassword.setHorizontalAlignment(SwingConstants.CENTER);
txtPassword.setForeground(new Color(0, 128, 0));
txtPassword.setFont(new Font("Meiryo", Font.BOLD, 18));
txtPassword.setOpaque(false);
txtPassword.setBackground(SystemColor.inactiveCaption);
txtPassword.setBounds(82, 139, 353, 53);
frame.getContentPane().add(txtPassword);
buttonLogin.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
buttonLogin.setBorderPainted(false);
buttonLogin.setBackground(new Color(0, 128, 0));
buttonLogin.setFont(new Font("Tahoma", Font.PLAIN, 18));
buttonLogin.setBounds(82, 216, 353, 53);
frame.getContentPane().add(buttonLogin);
labelRegister.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent me) {
try {
Desktop.getDesktop().browse(new
URI("insertURL"));
} catch (Exception ex) {
// System.out.println(ex);
}
}
});
}
}
I found a solution and I will post it here. Hopefully it helps other new coders out there.
My main problem was that I was trying to link two application windows. Instead of selecting New/Other/Jframe, I used New/Other/Application Window which makes it tough to call the second window.
I'm trying to open this gui from an action listener in another class but for whatever reason it's not doing it, any and all help appreciated.
package gui;
import java.awt.Color;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JScrollPane;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.UIManager.LookAndFeelInfo;
import javax.swing.table.DefaultTableModel;
import database.DBConnection;
import javax.swing.JButton;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import javax.swing.JTextArea;
import javax.swing.JTable;
public class OrderExample {
static JFrame frame;
public static void main(String[] args){
try {
for (LookAndFeelInfo info : UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (Exception e) {
// If Nimbus is not available, you can set the GUI to another look and feel.
}
JFrame frame = new JFrame();
JTable table= new JTable();
table.setBounds(428, 445, 396, -328);
Object[] columns = {"Product Id", "Product Name", "Description", "Price"};
DefaultTableModel model = new DefaultTableModel();
model.setColumnIdentifiers(columns);
table.setModel(model);
table.setBackground(Color.white);
table.setForeground(Color.black);
Font font = new Font("", 1, 22);
table.setRowHeight(30);
JTextField prodId = new JTextField();
JTextField prodName = new JTextField();
JTextField prodPrice = new JTextField();
JButton btnAdd = new JButton("Add");
JButton btnDelete = new JButton("Delete");
JButton btnExit = new JButton("Exit");
prodId.setBounds(20, 56, 230, 38);
prodName.setBounds(20, 129, 230, 38);
prodPrice.setBounds(21, 201, 229, 39);
btnAdd.setBounds(20, 451, 100, 38);
btnDelete.setBounds(150, 451, 100, 38);
btnExit.setBounds(20, 511, 100, 39);
JScrollPane pane = new JScrollPane(table);
pane.setBounds(281, 32, 440, 518);
frame.getContentPane().setLayout(null);
frame.getContentPane().add(pane);
frame.getContentPane().add(prodId);
frame.getContentPane().add(prodName);
frame.getContentPane().add(prodPrice);
frame.getContentPane().add(btnAdd);
frame.getContentPane().add(btnDelete);
frame.getContentPane().add(btnExit);
JLabel lblAddId = new JLabel("Product ID");
lblAddId.setBounds(20, 32, 79, 14);
frame.getContentPane().add(lblAddId);
JLabel lblProduct = new JLabel("Product Name");
lblProduct.setBounds(20, 105, 100, 14);
frame.getContentPane().add(lblProduct);
JLabel lblProductPrice = new JLabel("Product Price");
lblProductPrice.setBounds(20, 178, 90, 14);
frame.getContentPane().add(lblProductPrice);
JButton btnListProducts = new JButton("List Products");
btnListProducts.setBounds(150, 511, 100, 39);
frame.getContentPane().add(btnListProducts);
JTextArea description = new JTextArea();
description.setBounds(20, 276, 230, 164);
frame.getContentPane().add(description);
JLabel lblDescription = new JLabel("Description");
lblDescription.setBounds(20, 251, 116, 14);
frame.getContentPane().add(lblDescription);
Object[] row = new Object[4];
btnAdd.addActionListener(new ActionListener(){
#Override
public void actionPerformed(ActionEvent e) {
row[0] = prodId.getText();
row[1] = prodName.getText();
row[2] = description.getText();
row[3] = prodPrice.getText();
model.addRow(row);
try{
Connection connection = DBConnection.getConnection();
PreparedStatement ps = connection.prepareStatement("insert into stock(sname, description, quantity , price) values(?,?,20,?);");
ps.setString(1, prodName.getText());
ps.setString(2, description.getText());
ps.setDouble(3, Double.parseDouble( prodPrice.getText()));
ps.executeUpdate();
}
catch(SQLException sqle){
sqle.printStackTrace();
}
}
});
btnDelete.addActionListener(new ActionListener(){
#Override
public void actionPerformed(ActionEvent e) {
int i = table.getSelectedRow();
if(i >= 0){
model.removeRow(i);
}
else{
System.out.print("Delete ");
}
}
});
table.addMouseListener(new MouseAdapter(){
#Override
public void mouseClicked(MouseEvent e) {
int i = table.getSelectedRow();
prodId.setText(model.getValueAt(i, 0). toString());
prodName.setText(model.getValueAt(i, 1).toString());
prodPrice.setText(model.getValueAt(i, 3).toString());
description.setText(model.getValueAt(i, 2).toString());
}
});
btnListProducts.addActionListener(new ActionListener(){
#Override
public void actionPerformed(ActionEvent e){
int i = table.getSelectedRow();
try{
Connection connection = DBConnection.getConnection();
Statement statement = connection.createStatement();
ResultSet rs;
if(prodId.getText().equalsIgnoreCase(""))
rs = statement.executeQuery("select * from stock;");
else
rs = statement.executeQuery("select * from stock where stockID = " + prodId.getText() + ";");
while(rs.next()){
row[0] = rs.getInt("stockID");
row[1] = rs.getString("sname");
row[2] = rs.getString("description");
row[3] = rs.getDouble("price");
model.addRow(row);
}
} catch (SQLException e1) {
e1.printStackTrace();
}
}
});
btnExit.addActionListener(new ActionListener(){
#Override
public void actionPerformed(ActionEvent e){
frame.dispose();
}
});
frame.setSize(771, 600);
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}
This is the actionlistener code
btnStock.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
OrderExample window = new OrderExample();
}
});
I've tried to set window to visible but it just gives me an error.
The class OrderExamplehas all of its functionality in its (static) main method which is never been called by your Actionlistener implementation.
You could simply add the call to OrderExample.main to your Actionlistener implementation, but you should better first move the content of main to a non static method (e.g.: init) and call that.
Evening all,
So I've been working on creating a local database using SQLite. (As a plugin that is part of Firefox). It uses three classes:
databaseConnection
Login
Display
and two tables (which come under the database MyFilms) called:
Users
MyFilms
databaseConnection is used to simply just connect to my SQLite database MyFilms, which it does fine.
The second class, Login, access my Users table from my database so it can access the logins and proceed to my GUI called Display.
Display will load the following GUI, which consists of a button, which when clicked is supposed to load the data from my database table MyFilms into a JTable:
However, when I click the button, nothing loads... it even looks like the JTable is not there, but when I check my code it defiantly is!
The code where I think the problem might lie is:
JButton btnLoadData = new JButton("Load Data");
btnLoadData.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
try{
String query ="Select * from MyFilms";
PreparedStatement pst = connection.prepareStatement(query);
ResultSet rs = pst.executeQuery();
table.setModel(DbUtils.resultSetToTableModel(rs));
}
catch (Exception anException){
anException.printStackTrace();
}
}
});
Any idea why the database is not showing here? Please find the code to each class below:
databaseConnection:
import java.sql.*;
import javax.swing.*;
public class databaseConnection {
Connection conn = null;
public static Connection dbConnector(){
try{
Class.forName("org.sqlite.JDBC");
Connection conn = DriverManager.getConnection("jdbc:sqlite:C:\\Users\\Joe\\workspace\\MyFilms.sqlite");
JOptionPane.showMessageDialog(null, "Connection Successful!");
return conn;
}
catch(Exception anException)
{
JOptionPane.showMessageDialog(null, anException);
return null;
}
}
}
Login:
import java.awt.EventQueue;
import javax.swing.JFrame;
import java.sql.*;
import javax.swing.*;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
public class Login {
private JFrame frmTest;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
Login window = new Login();
window.frmTest.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
Connection connection = null;
private JTextField textFieldUN;
private JPasswordField passwordField;
/**
* Create the application.
*/
public Login() {
initialize();
connection = databaseConnection.dbConnector();
}
/**
* Initialise the contents of the frame.
*/
private void initialize() {
frmTest = new JFrame();
frmTest.setTitle("Database Login");
frmTest.setBounds(100, 100, 345, 184);
frmTest.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frmTest.getContentPane().setLayout(null);
JLabel lblNewLabel = new JLabel("Username:");
lblNewLabel.setBounds(34, 37, 64, 14);
frmTest.getContentPane().add(lblNewLabel);
JLabel lblNewLabel_1 = new JLabel("Password:");
lblNewLabel_1.setBounds(34, 66, 64, 14);
frmTest.getContentPane().add(lblNewLabel_1);
textFieldUN = new JTextField();
textFieldUN.setBounds(126, 34, 151, 20);
frmTest.getContentPane().add(textFieldUN);
textFieldUN.setColumns(10);
JButton btnLogin = new JButton("Login");
frmTest.getRootPane().setDefaultButton(btnLogin);
btnLogin.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
try{
String query = "Select * from Users where username=? and password=?";
PreparedStatement pst = connection.prepareStatement(query);
pst.setString(1, textFieldUN.getText());
pst.setString(2, passwordField.getText());
ResultSet rs = pst.executeQuery();
int count = 0;
while(rs.next()){
count = count +1;
}
if (count == 1){
frmTest.dispose();
Display GUI = new Display();
GUI.setVisible(true);
}
else if (count > 1){
JOptionPane.showMessageDialog(null, "Duplicate Username and Password");
}
else{
JOptionPane.showMessageDialog(null, "Username or Password is not correct - Please try again..");
}
rs.close();
pst.close();
}
catch (Exception anException){
JOptionPane.showMessageDialog(null, anException);
}
}
});
btnLogin.setBounds(126, 111, 89, 23);
frmTest.getContentPane().add(btnLogin);
passwordField = new JPasswordField();
passwordField.setBounds(126, 64, 151, 17);
frmTest.getContentPane().add(passwordField);
}
}
Display:
import java.awt.BorderLayout;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import net.proteanit.sql.DbUtils;
import javax.swing.JButton;
import javax.swing.JTable;
import javax.swing.JScrollPane;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.sql.*;
public class Display extends JFrame {
private JPanel contentPane;
private JTable table;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
Display frame = new Display();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
Connection connection = null;
/**
* Create the frame.
*/
public Display() {
connection = databaseConnection.dbConnector();
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 711, 443);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(null);
JButton btnLoadData = new JButton("Load Data");
btnLoadData.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
try{
String query ="Select * from MyFilms";
PreparedStatement pst = connection.prepareStatement(query);
ResultSet rs = pst.executeQuery();
table.setModel(DbUtils.resultSetToTableModel(rs));
}
catch (Exception anException){
anException.printStackTrace();
}
}
});
btnLoadData.setBounds(596, 11, 89, 23);
contentPane.add(btnLoadData);
JScrollPane scrollPane = new JScrollPane();
scrollPane.setBounds(684, 45, -675, 349);
contentPane.add(scrollPane);
table = new JTable();
scrollPane.setViewportView(table);
}
}
Any help would be greatly appreciated! Cheers..
However, when I run it in Eclipse I receive no errors at all. It runs fine, just does not display the database in the JTable.
Could you please replace your Display.java with the following:
Display.java
import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.border.EmptyBorder;
import net.proteanit.sql.DbUtils;
public class Display extends JFrame {
private static final long serialVersionUID = 1L;
private JPanel contentPane;
private JTable table;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
Display frame = new Display();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
Connection connection = null;
/**
* Create the frame.
*/
public Display() {
connection = databaseConnection.dbConnector();
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 711, 443);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(new BorderLayout());
JButton btnLoadData = new JButton("Load Data");
btnLoadData.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
try {
String query = "Select * from MyFilms";
PreparedStatement pst = connection.prepareStatement(query);
ResultSet rs = pst.executeQuery();
table.setModel(DbUtils.resultSetToTableModel(rs));
} catch (Exception anException) {
anException.printStackTrace();
}
}
});
// btnLoadData.setBounds(596, 11, 89, 23);
JPanel buttonPanel = new JPanel();
buttonPanel.setLayout(new BorderLayout());
buttonPanel.add(btnLoadData, BorderLayout.EAST);
contentPane.add(buttonPanel, BorderLayout.NORTH);
JScrollPane scrollPane = new JScrollPane();
// scrollPane.setBounds(684, 45, -675, 349);
table = new JTable();
scrollPane.setViewportView(table);
contentPane.add(scrollPane, BorderLayout.CENTER);
}
}
and see the results?
Few changes have been made to your code. They are:
1) You first added scrollPane to the contentPane then you added table to scrollPane. I changed the order.
2) You used absolute layout. I changed that with BorderLayout.
The result displayed on my system is:
Hope this helps!
I created a main window where the user will click if he's a system admin, an employee or a member a finance, one of my problem is that they are not centered in the screen, how would I do that? Second, I want it to work like, when I click the Finance Button, the Mainwindow Will close and it will bring me to my log in screen, how would I do that?? Here's my MainWindow Code
import java.awt.BorderLayout;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import java.awt.CardLayout;
import javax.swing.JEditorPane;
import javax.swing.SpringLayout;
import javax.swing.JButton;
import javax.swing.JTextField;
import javax.swing.JLabel;
import javax.swing.JFormattedTextField;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
public class MainWindow extends JFrame {
private JPanel contentPane;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
MainWindow frame = new MainWindow();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
*/
public MainWindow() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 333, 191);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(new BorderLayout(0, 0));
JButton btnNewButton = new JButton("Employee");
contentPane.add(btnNewButton, BorderLayout.WEST);
JButton btnNewButton_1 = new JButton("Finance");
btnNewButton_1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
Login login = new Login();
}
});
contentPane.add(btnNewButton_1, BorderLayout.CENTER);
JButton btnNewButton_2 = new JButton("System Admin");
contentPane.add(btnNewButton_2, BorderLayout.EAST);
JLabel lblNewLabel = new JLabel("Welcome");
contentPane.add(lblNewLabel, BorderLayout.NORTH);
}
}
here is my code for a login form
import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JLabel;
import javax.swing.JTextField;
import javax.swing.JPasswordField;
import javax.swing.JButton;
import javax.swing.JPanel;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
public class Login extends JFrame {
private JLabel label1, label2;
private JButton submit;
private JTextField textfield1;
private JPasswordField passfield;
private JPanel panel;
public Login() {
setSize(300, 100);
setVisible(true);
setDefaultCloseOperation(EXIT_ON_CLOSE);
label1 = new JLabel("User ID:");
textfield1 = new JTextField(15);
label2 = new JLabel("Password:");
passfield = new JPasswordField(15);
submit = new JButton("Submit");
panel = new JPanel(new GridLayout(3, 1));
panel.add(label1);
panel.add(textfield1);
panel.add(label2);
panel.add(passfield);
panel.add(submit);
add(panel, BorderLayout.CENTER);
ButtonHandler handler = new ButtonHandler();
submit.addActionListener(handler);
}// end login constructor
private class ButtonHandler implements ActionListener {
public void actionPerformed(ActionEvent event) {
String user = textfield1.getText();
char[] passChars = passfield.getPassword();
Connection conn = Jdbc.dbConn();
PreparedStatement ps = null;
ResultSet rs = null;
String pass = new String(passChars);
if (passChars != null) {
String sql = "SELECT employee_ID, employee_password FROM user WHERE employee_ID = ? AND employee_password = ?";
try {
ps = conn.prepareStatement(sql);
ps.setString(1, user);
ps.setString(2, pass);
rs = ps.executeQuery();
if (rs.next()) {
JOptionPane.showMessageDialog(null,"Welcome! "+user);
} else {
JOptionPane.showMessageDialog(null, "Wrong Input");
}
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
rs.close();
ps.close();
conn.close();
} catch (Exception ee) {
ee.printStackTrace();
}
}
}// end actionPerformed
}// End ButtonHandler
}// End of class
}
Some suggestions:
Do not use setBounds() for MainWindow (JFrame). Use some Layout and at end use pack(). If you want to set size manually then you can also use setSize().
To close current window and open Login frame add setVisible(false) or dispose() and create Login object and make it visible.
For making frame to be at center try setLocationRelativeTo(null);.
Do not use variable names like label1, textFiled2, btnNewButton, etc... Use proper names for proper variable that reflects it usage.
Example for point 2:
btnNewButton_1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
setVisible(false);
Login login = new Login();
}
});
You need to carefully choose a layout manager to suit your needs. You are currently using BorderLayout which doesn't seem to do what you want.
Try adding your three buttons to a JPanel and then setting that panel as your frame's content pane. JPanel uses FlowLayout by default which should do the trick.