Develop Reference

SQLite Database Table not connecting

I am trying to create a program that will generate student info within a table. I have created a database within SQLite studio and a table named data. I also have successfully connected the database to my program, however, when the program is ran, there is an sql error saying the table is missing. Please advise.
import java.sql.*;
import javax.swing.*;
public class connection {
Connection conn = null;
public static Connection dbConnector() {
try {
Class.forName("org.sqlite.JDBC");
Connection conn = DriverManager.getConnection("jdbc:sqlite:\\Macintosh HD⁩\\Users\\ethantang⁩\\Desktop⁩\\eclipse-workspace~⁩\\FBLA project⁩\\students.sqlite");
JOptionPane.showMessageDialog(null, "Connected");
return conn;
}
catch(Exception e) {
JOptionPane.showMessageDialog(null, e);
return null;
}
}
}
import java.awt.BorderLayout;
import java.sql.*;
import javax.swing.*;
import java.awt.EventQueue;
import net.proteanit.sql.DbUtils;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import net.proteanit.sql.DbUtils;
import javax.swing.JTable;
import javax.swing.JScrollPane;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.awt.event.ActionEvent;
public class database 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 {
database frame = new database();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
Connection connect = null;
/**
* Create the frame.
*/
public database() {
connect = connection.dbConnector();
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 450, 300);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(null);
JScrollPane scrollPane = new JScrollPane();
scrollPane.setBounds(6, 45, 438, 227);
contentPane.add(scrollPane);
table = new JTable();
scrollPane.setViewportView(table);
JButton btnNewButton = new JButton("Load Database");
btnNewButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
try {
String query = "select * from data";
PreparedStatement pst = connect.prepareStatement(query);
ResultSet rs = pst.executeQuery();
table.setModel(DbUtils.resultSetToTableModel(rs));
}
catch (Exception a){
a.printStackTrace();
}
}
});
btnNewButton.setBounds(167, 6, 117, 29);
contentPane.add(btnNewButton);
}
}

Trouble inserting data into SQLite database. Can't get a connection to the database. Why isn't it working?

I created a program with a few lines of code after getting some advice her on Stackoverflow. My problem is that I can't connect to the database. I get an error called: [SQLITE_ERROR] SQL error or missing database (no such table: PasswordTable).
I created the database via SQLite and also get a successfull connection but cannot insert data.
The database in SQLiteManager is called MyDB.sqlite and the table is called PasswordTable
...I am thankful for any help I can get :)
Also: Did I do the implementation of the inner class right? Is this appropriate?
Code is as follows:
import javax.swing.*;
public class Main {
public static void main (String [] args) {
JFrame frame = new JFrame ();
frame.setSize(500, 500);
frame.setResizable(false);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLocation(700, 300);
frame.add(new FrameFunctionality ());
frame.setVisible(true);
}
}
import javax.swing.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
public class FrameFunctionality extends JPanel {
JLabel label1;
JTextField tf1;
JButton but1;
Database db1;
public FrameFunctionality() {
setLayout(null);
//----Add a label to the frame
label1 = new JLabel("Passwort eingeben:");
label1.setBounds(10, 20, 150, 40);
add (label1);
//-------Add a tf to the frame
tf1 = new JTextField ();
tf1.setBounds(10, 50, 150, 40);
add (tf1);
//---Add a button to the frame
but1 = new JButton ("Save");
but1.setBounds(10, 100, 100, 50);
but1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
db1 = new Database ();
db1.insertData();
}
});
add (but1);
}
public class Database { //Inner Class
Connection con = null;
DriverManager man1 = null;
PreparedStatement pst = null;
public Database () {
//------Connect to the database
try {
Class.forName("org.sqlite.JDBC");
con = DriverManager.getConnection("jdbc:sqlite:MyDB.sqlite");
System.out.println("Connection: Ok!");
} catch (Exception e) {
System.out.println("Error1: " + e.getMessage());
}
}
//Insert data into the database
public void insertData () {
try {
String query = "INSERT INTO PasswordTable (Passwort) VALUES
(?)";
pst = con.prepareStatement(query);
pst.setString(1, tf1.getText());
pst.execute();
}catch (Exception e) {
System.out.println("Error2: " + e.getMessage());
}
}
}
}

Separate GUI class and main class

I have 2 class .1 for GUI.1 from others.
LoginUser.java
package login;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import database.DatabaseConnection;
public class LoginUser{
public int doLogin(String username, String password) throws Exception
{
int level =0;
DatabaseConnection databaseConnection = new DatabaseConnection();
Connection con = databaseConnection.getConnection();
String sql ="select level from staff where username=? and password=?";
PreparedStatement ps =con.prepareStatement(sql);
//no 1 and two refer to ? at String sql =...
//Tukar String pada int
ps.setString(1, username);
//int iPassword = Integer.parseInt(password);
ps.setString(2, password);
ResultSet rs = ps.executeQuery();
if(rs.next())
{
level = rs.getInt(1);
}
//must close all connection
rs.close();ps.close();con.close();
return level;
}
public static void main(String[] args) {
//test sama ada login berjaya atau tak?
LoginUser lgn = new LoginUser();
try {
int level =lgn.doLogin("1008", "test123");
System.out.println("Access Level : "+level);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
Another one is for GUI class
LoginInterface.java
package login;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JLabel;
import javax.swing.JTextField;
import javax.swing.JButton;
import java.awt.Font;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JPasswordField;
import java.awt.Color;
import login.LoginUser;
public class LoginInterface {
private JFrame frame;
private JTextField txtStaffID;
private JPasswordField txtPassword;
/**
* Launch the application.
*/
public static void login() {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
LoginInterface window = new LoginInterface();
window.frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the application.
*/
public LoginInterface() {
initialize();
}
/**
* Initialize the contents of the frame.
*/
private void initialize() {
frame = new JFrame();
frame.setBounds(100, 100, 678, 421);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().setLayout(null);
JLabel lblStaffId = new JLabel("Username :");
lblStaffId.setForeground(Color.BLACK);
lblStaffId.setFont(new Font("Times New Roman", Font.PLAIN, 16));
lblStaffId.setBounds(108, 158, 89, 23);
frame.getContentPane().add(lblStaffId);
txtStaffID = new JTextField();
txtStaffID.setBounds(207, 160, 200, 23);
frame.getContentPane().add(txtStaffID);
txtStaffID.setColumns(10);
JLabel lblPassword = new JLabel("Password :");
lblPassword.setForeground(Color.BLACK);
lblPassword.setFont(new Font("Times New Roman", Font.PLAIN, 16));
lblPassword.setBounds(108, 192, 101, 49);
frame.getContentPane().add(lblPassword);
JButton btnLogIn = new JButton("LOGIN");
btnLogIn.setBackground(new Color(0, 206, 209));
btnLogIn.setForeground(new Color(0, 0, 0));
btnLogIn.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
LoginUser lgn = new LoginUser();
try {
String username =txtStaffID.getText();
#SuppressWarnings("deprecation")
String password = txtPassword.getText();
int level =lgn.doLogin(username, password);
if(level == 1)
{
JOptionPane.showMessageDialog(null, "You successfully login");
}
else
{
JOptionPane.showMessageDialog(null, "Your password or username incorrect");
}
System.out.println("Access Level : "+level);
} catch (Exception e1) {
JOptionPane.showMessageDialog(null, "Please insert your username and password");
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
});
btnLogIn.setFont(new Font("Times New Roman", Font.PLAIN, 16));
btnLogIn.setBounds(283, 272, 113, 34);
frame.getContentPane().add(btnLogIn);
txtPassword = new JPasswordField();
txtPassword.setBounds(207, 208, 200, 20);
frame.getContentPane().add(txtPassword);
}
}
I use PHPmyadmin and XAMPP as for database.Please help me :(
I cant run LoginInterface.I dont know why.Is something wrong on my eclipse luna?
Its only display for running LoginUser.java

You never called LoginInterface.login(); Just add it to your main method.

Adding values to JTable as dynamicly

I have a textbox which sent something to database and jtable list the values from database. But when i add something to database. Jtable dont show it in same time. when i close the program and debug again, it shows that time. I want Jtabel to show textbox value when i click the save button. How can i create a dynamic jtable?
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
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.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;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableColumn;
public class Topic extends JFrame {
private static final long serialVersionUID = 1L;
JFrame frmTopic;
JPanel pnl, pnl_generaltopic;
static JTextField txt_topic;
JLabel lbl_topicNme, lbl_topicpage;
JButton btn_close, btn_update, btn_save;
public static Connection con = null;
public static ResultSet rs = null;
public static Statement st = null;
static Vector<Vector<String>> data = new Vector<Vector<String>>();
private JScrollPane scrollPane;
private static JTable table;
public Topic() {
pnl_generaltopic = new JPanel();
pnl_generaltopic.setBackground(Color.lightGray);
pnl_generaltopic.setLayout(null);
frmTopic = new JFrame("Topic");
frmTopic.addWindowListener(new WindowAdapter() {
#Override
public void windowOpened(WindowEvent arg0) {
con = Dbconnect.conect();
}
});
frmTopic.setTitle("E-TEST");
frmTopic.setBounds(100, 100, 500, 500);
frmTopic.setVisible(true);
frmTopic.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frmTopic.getContentPane().setLayout(new BorderLayout(0, 0));
frmTopic.getContentPane().add(pnl_generaltopic);
topicPanel();
topicTable();
}
public void topicPanel() {
JPanel panel_addingNewTopic = new JPanel();
panel_addingNewTopic.setBounds(10, 0, 464, 203);
pnl_generaltopic.add(panel_addingNewTopic);
panel_addingNewTopic.setLayout(null);
btn_save = new JButton("Save");
btn_save.setBounds(65, 166, 67, 23);
panel_addingNewTopic.add(btn_save);
btn_update = new JButton("Update");
btn_update.setBounds(142, 162, 90, 30);
panel_addingNewTopic.add(btn_update);
btn_close = new JButton("Close");
btn_close.setBounds(240, 162, 90, 30);
panel_addingNewTopic.add(btn_close);
txt_topic = new JTextField();
txt_topic.setBounds(65, 59, 270, 71);
panel_addingNewTopic.add(txt_topic);
lbl_topicNme = new JLabel("Topic Name");
lbl_topicNme.setBounds(10, 65, 150, 59);
panel_addingNewTopic.add(lbl_topicNme);
lbl_topicpage = new JLabel("Topic Page");
lbl_topicpage.setBounds(10, 11, 300, 20);
panel_addingNewTopic.add(lbl_topicpage);
lbl_topicpage.setFont(new Font("arial", Font.BOLD, 15));
btn_close.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
frmTopic.dispose();
}
}
);
btn_save.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
try {
st = con.createStatement();
String sorgu = "insert into topic " + "(topicname)"
+ "VALUES ('" + txt_topic.getText() + "')";
st.executeUpdate(sorgu);
JOptionPane.showMessageDialog(Topic.this, "Topic was added");
} catch (Exception s) {
System.out.print(s.getMessage());
}
}
}
);
}
public void topicTable() {
scrollPane = new JScrollPane();
scrollPane.setBounds(10, 226, 464, 190);
pnl_generaltopic.add(scrollPane);
Vector<String> headers = new Vector<String>();
headers.add("Topic Name");
getData();
//this is the model which contain actual body of JTable
DefaultTableModel model = new DefaultTableModel(data, headers);
table = new JTable(model);
scrollPane.setColumnHeaderView(table);
table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
//table=new JTable(model);
//table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
header_size();
//JScrollPane scroll = new JScrollPane(table);
scrollPane.setHorizontalScrollBarPolicy(
JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
scrollPane.setVerticalScrollBarPolicy(
JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);
pack();
setResizable(false);
setVisible(true);
}
/**
* Setting the particular Column Size in JTable
*/
public static void header_size() {
TableColumn column = table.getColumnModel().getColumn(0);
column.setPreferredWidth(100);
column = table.getColumnModel().getColumn(0);
column.setPreferredWidth(350);
}
/**
* Fetching Data From MySql Database
* and storing in a Vector of a Vector
* to Display in JTable
*/
private static void getData() {
// Enter Your MySQL Database Table name in below Select Query.
String str = "select * from topics";
Connection con;
ResultSet rs;
Statement st;
try {
con = DriverManager.getConnection("jdbc:mysql://" + "localhost:3306/database", "root", "1234");
st = con.createStatement();
rs = st.executeQuery(str);
while (rs.next()) {
Vector<String> d = new Vector<String>();
d.add(rs.getString("topicname"));
d.add("\n\n\n\n\n\n\n");
data.add(d);
}
} catch (SQLException e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
Topic topic = new Topic();
topic.setVisible(false);
}
}

You can use the addRow(...) method of the DefaultTableModel to dynamically add a row of data in the model.
So if the update to your database is successful, then you would invoke the addRow() method.
Also, you should use a PreparedStatement when using SQL. It will make creating the SQL easier since you don't need to worry about the delimiters. Simple example to give you an idea:
String sql = "INSERT INTO Page (Name, Title) VALUES (?, ?)";
PreparedStatement stmt = connection.prepareStatement(sql);
stmt.setString( 1, "Name1" );
stmt.setString( 2, textField.getText() );
stmt.executeUpdate();

java.lang.NullPointerException error populating JTable from mysql

Im trying to populate JTable with MySql data. Thing is when i run Login class, i receive message "java.SQLException: No value specified for parameter 2" and when i run JTable class I keep receiving java.lang.NullPointerException error. I have three classes : 1-Connection to DB:
import java.sql.Connection;
import java.sql.DriverManager;
import javax.swing.JOptionPane;
public class javaconnect {
Connection conn = null;
public static Connection ConnecrDB() {
try {
Class.forName("com.mysql.jdbc.Driver");
Connection con = DriverManager.getConnection(
"jdbc:mysql://localhost:3306/mydb",
"root", "root");
JOptionPane.showMessageDialog(null, "Connected");
return con;
} catch (Exception e) {
System.out.println("ERROR: " + e.getMessage());
}
return null;
}
}
The second class is login frame:
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.*;
import javax.swing.JOptionPane;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
public class JFrameLogIn extends JFrame {
Connection conn =null;
ResultSet rs = null;
PreparedStatement pst = null;
private JPanel contentPane;
private JPasswordField txt_Password;
private JTextField txt_Username;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
JFrameLogIn frame = new JFrameLogIn();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
*/
public JFrameLogIn() {
conn=javaconnect.ConnecrDB();
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 375, 214);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(null);
JLabel lblUsername = new JLabel("Username:");
lblUsername.setFont(new Font("Tahoma", Font.BOLD, 13));
lblUsername.setBounds(126, 45, 80, 14);
contentPane.add(lblUsername);
JLabel lblPassword = new JLabel("Password:");
lblPassword.setFont(new Font("Tahoma", Font.BOLD, 13));
lblPassword.setBounds(126, 82, 69, 14);
contentPane.add(lblPassword);
txt_Password = new JPasswordField();
txt_Password.setBounds(218, 82, 109, 20);
contentPane.add(txt_Password);
txt_Username = new JTextField();
txt_Username.setBounds(216, 43, 111, 20);
contentPane.add(txt_Username);
txt_Username.setColumns(10);
JButton cmd_Login = new JButton("Login");
cmd_Login.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
String sql = "Select * from clients where username=? and password=?";
try{
pst = conn.prepareStatement(sql);
pst.setString(1, txt_Username.getText());
pst.setString(1, txt_Password.getText());
rs = pst.executeQuery();
if(rs.next()){
JOptionPane.showMessageDialog(null, "Username and Password are correct");
}
else {
JOptionPane.showMessageDialog(null, "Username and Password are not correct");
}
}
catch(Exception e){
JOptionPane.showMessageDialog(null, e);
}
}
});
cmd_Login.setBounds(218, 125, 80, 23);
contentPane.add(cmd_Login);
}
}
and the last one is JTable
import java.awt.EventQueue;
import javax.swing.*;
import javax.swing.border.EmptyBorder;
import java.sql.*;
import net.proteanit.sql.DbUtils;
public class JTable1 extends JFrame {
Connection conn = null;
ResultSet rs = null;
PreparedStatement pst = null;
private JPanel contentPane;
private JTable table_Admins;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
JTable1 frame = new JTable1();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
*/
public JTable1() {
conn = javaconnect.ConnecrDB();
UpdateTable ();
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 450, 300);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(null);
table_Admins = new JTable();
table_Admins.setBounds(30, 28, 378, 54);
contentPane.add(table_Admins);
}
private void UpdateTable () {
try {
String sql = "SELECT *FROM menu";
pst = conn.prepareStatement(sql);
rs = pst.executeQuery();
table_Admins.setModel(DbUtils.resultSetToTableModel(rs));
}
catch (Exception e){
JOptionPane.showMessageDialog(null, e);
}
}
}
I am trying to figure out what is the problem but cannot find the solution. Connection works. I would really appreciate your help in fixing this error.

The second parameter in your PreparedStatment is not set. You should replace
pst.setString(1, txt_Password.getText());
with
pst.setString(2, txt_Password.getText());
Edit: Note that JPassword.getText() is deprecated meaning that you should no longer use it. getPassword() is provided in its place:
pst.setString(2, new String(txt_Password.getPassword()));

you can add a check to the code
rs = pst.executeQuery();
if (rs!=null){
if(rs.next()){
JOptionPane.showMessageDialog(null, "Username and Password are correct");
}
else {
JOptionPane.showMessageDialog(null, "Username and Password are not correct");
}
}
And Also in your JTable1 class
if (rs!=null)
table_Admins.setModel(DbUtils.resultSetToTableModel(rs));

private void UpdateTable () {
conn = javaconnect.ConnecrDB();// connection and query should be in same place
try {
String sql = "SELECT *FROM menu";
pst = conn.prepareStatement(sql);
rs = pst.executeQuery();
table_Admins.setModel(DbUtils.resultSetToTableModel(rs));
}
catch (Exception e){
JOptionPane.showMessageDialog(null, e);
}