Java MySQL JList – INSERT SELECT UPDATE DELETE Tutorial.
This is an Java MySQL JList example .Its a simple CRUD app.We shall save items to MySQL,retrieve,update and delete.We shall be using JTextfields,JButtons and JList.We used netbeans in this tutorial.
What we do :
- Connect to MySQL using JDBC.
- User types data into JTextField and clicks save button.
- We then save this data into MySQL.
- We retrieve after saving and bind our data to JList.
- As user enters data he can see the changes he’s made.
- User can select an item from JList.
- It gets set to the corresponding jtextfield.
- He can change and click update to update.
- Or he can delete and it gets deleted from MySQL database.
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SECTION 1 : Our Database Class
Database CRUD class
Main Responsibility : Perform all CRUD operations.
- INSERTS/SAVES data to MySQL database.
- SELECTS/RETRIEVES data to MySQL.
- UPDATES/EDITS data.
- DELETES data.
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package jlist.database; import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; import javax.swing.DefaultListModel; public class DBClass { String conString = "jdbc:mysql://localhost:3306/playersdb"; String username = "root"; String password = ""; //INSERT INTO DB public Boolean add(String name) { //SQL STMT String sql = "INSERT INTO playerstb(Name) VALUES('" + name + "')"; try { //GET COONECTION Connection con = DriverManager.getConnection(conString, username, password); // PREPARED STMT Statement s = con.prepareStatement(sql); //EXECUTE s.execute(sql); return true; } catch (Exception ex) { ex.printStackTrace(); return false; } } //RETRIEVE DATA public DefaultListModel retrieve() { DefaultListModel dm = new DefaultListModel(); //SQL STMT String sql = "SELECT Name FROM playerstb"; try { Connection con = DriverManager.getConnection(conString, username, password); //PREPARED STMT Statement s = con.prepareStatement(sql); ResultSet rs = s.executeQuery(sql); //LOOP THRU GETTING ALL VALUES while (rs.next()) { //GET VALUES String name = rs.getString(1); //ADD TO DM dm.addElement(name); } return dm; } catch (Exception ex) { ex.printStackTrace(); } return null; } //UPDATE DATA public Boolean update(String id, String value) { String sql = "UPDATE playerstb SET Name ='" + value + "' WHERE Name='" + id + "'"; try { Connection con=DriverManager.getConnection(conString, username, password); //STATEMENT Statement s=con.prepareStatement(sql); //EXECUTE s.execute(sql); return true; } catch (SQLException ex) { ex.printStackTrace(); return false; } } //DELETE DATA public Boolean delete(String id) { //SQL STMT String sql="DELETE FROM playerstb WHERE Name ='"+id+"'"; try { //CONNECTION Connection con=DriverManager.getConnection(conString, username, password); //sTAETEMT Statement s=con.prepareStatement(sql); //EXECUTE s.execute(sql); return true; }catch (SQLException ex) { ex.printStackTrace(); return false; } } } |
SECTION 2 : Our GUI Class
GUI and Main class
Main Responsibility : STARTS OUR APPLICATION
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- Is our main class.
- Derives from JFrame.
- Handles all GUI interactions such as input of data.
- Instantiates Database class and invokes its database manipulation methods.
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package jlist.database; import javax.swing.DefaultListModel; import javax.swing.JOptionPane; public class GUI_Jlist extends javax.swing.JFrame { String id=""; public GUI_Jlist() { initComponents(); } private void retrieve() { DefaultListModel dm=new DBClass().retrieve(); jList1.setModel(dm); } @SuppressWarnings("unchecked") // <editor-fold defaultstate="collapsed" desc="Generated Code"> private void initComponents() { jLabel2 = new javax.swing.JLabel(); jPanel1 = new javax.swing.JPanel(); jScrollPane1 = new javax.swing.JScrollPane(); jList1 = new javax.swing.JList(); jLabel1 = new javax.swing.JLabel(); nameTxt = new javax.swing.JTextField(); addBtn = new javax.swing.JButton(); updateBtn = new javax.swing.JButton(); retrieveBtn = new javax.swing.JButton(); deleteBtn = new javax.swing.JButton(); clearBtn = new javax.swing.JButton(); setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); jLabel2.setText("ProgrammingWizards Channel"); jPanel1.setBackground(new java.awt.Color(45, 155, 193)); jList1.addMouseListener(new java.awt.event.MouseAdapter() { public void mouseClicked(java.awt.event.MouseEvent evt) { jList1MouseClicked(evt); } }); jScrollPane1.setViewportView(jList1); javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1); jPanel1.setLayout(jPanel1Layout); jPanel1Layout.setHorizontalGroup( jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(jPanel1Layout.createSequentialGroup() .addContainerGap() .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 303, javax.swing.GroupLayout.PREFERRED_SIZE) .addContainerGap(18, Short.MAX_VALUE)) ); jPanel1Layout.setVerticalGroup( jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(jPanel1Layout.createSequentialGroup() .addContainerGap() .addComponent(jScrollPane1) .addContainerGap()) ); jLabel1.setText("Name"); addBtn.setText("Add"); addBtn.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { addBtnActionPerformed(evt); } }); updateBtn.setText("Update"); updateBtn.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { updateBtnActionPerformed(evt); } }); retrieveBtn.setText("Retrieve"); retrieveBtn.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { retrieveBtnActionPerformed(evt); } }); deleteBtn.setText("Delete"); deleteBtn.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { deleteBtnActionPerformed(evt); } }); clearBtn.setText("Clear"); clearBtn.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { clearBtnActionPerformed(evt); } }); javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane()); getContentPane().setLayout(layout); layout.setHorizontalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addContainerGap(475, Short.MAX_VALUE) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup() .addComponent(retrieveBtn) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) .addComponent(deleteBtn) .addGap(35, 35, 35)) .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup() .addComponent(clearBtn) .addGap(78, 78, 78)) .addGroup(layout.createSequentialGroup() .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addComponent(addBtn) .addGroup(layout.createSequentialGroup() .addGap(13, 13, 13) .addComponent(jLabel1))) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addGap(29, 29, 29) .addComponent(updateBtn)) .addGroup(layout.createSequentialGroup() .addGap(3, 3, 3) .addComponent(nameTxt, javax.swing.GroupLayout.PREFERRED_SIZE, 118, javax.swing.GroupLayout.PREFERRED_SIZE))) .addContainerGap()))) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addGap(102, 102, 102) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addGap(147, 147, 147) .addComponent(jLabel2)) .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)) .addContainerGap(224, Short.MAX_VALUE))) ); layout.setVerticalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addGap(86, 86, 86) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) .addComponent(jLabel1) .addComponent(nameTxt, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)) .addGap(131, 131, 131) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) .addComponent(addBtn) .addComponent(updateBtn)) .addGap(46, 46, 46) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) .addComponent(retrieveBtn) .addComponent(deleteBtn)) .addGap(43, 43, 43) .addComponent(clearBtn) .addContainerGap(125, Short.MAX_VALUE)) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addGap(25, 25, 25) .addComponent(jLabel2) .addGap(8, 8, 8) .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE) .addGap(25, 25, 25))) ); pack(); }// </editor-fold> private void jList1MouseClicked(java.awt.event.MouseEvent evt) { id=jList1.getSelectedValue().toString(); nameTxt.setText(id); } //ADD private void addBtnActionPerformed(java.awt.event.ActionEvent evt) { if(new DBClass().add(nameTxt.getText())) { JOptionPane.showMessageDialog(null, "Successfully Inserted"); nameTxt.setText(""); retrieve(); }else { JOptionPane.showMessageDialog(null, "Not Inserted"); } } //UPDATE private void updateBtnActionPerformed(java.awt.event.ActionEvent evt) { if(new DBClass().update(id,nameTxt.getText())) { JOptionPane.showMessageDialog(null, "Successfully Updated"); nameTxt.setText(""); retrieve(); }else { JOptionPane.showMessageDialog(null, "Not Updated"); } } //RETRIEVE private void retrieveBtnActionPerformed(java.awt.event.ActionEvent evt) { retrieve(); } //DELETE private void deleteBtnActionPerformed(java.awt.event.ActionEvent evt) { if(new DBClass().delete(id)) { JOptionPane.showMessageDialog(null, "Successfully Deleted"); nameTxt.setText(""); retrieve(); }else { JOptionPane.showMessageDialog(null, "Not Deleted"); } } //CLEAR private void clearBtnActionPerformed(java.awt.event.ActionEvent evt) { jList1.setModel(new DefaultListModel()); } / * @param args the command line arguments */ public static void main(String args[]) { java.awt.EventQueue.invokeLater(new Runnable() { public void run() { new GUI_Jlist().setVisible(true); } }); } // Variables declaration - do not modify private javax.swing.JButton addBtn; private javax.swing.JButton clearBtn; private javax.swing.JButton deleteBtn; private javax.swing.JLabel jLabel1; private javax.swing.JLabel jLabel2; private javax.swing.JList jList1; private javax.swing.JPanel jPanel1; private javax.swing.JScrollPane jScrollPane1; private javax.swing.JTextField nameTxt; private javax.swing.JButton retrieveBtn; private javax.swing.JButton updateBtn; // End of variables declaration } |
LAST SECTION
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- To see the XML we were parsing and the website itself please have look at the tutorial at our youtbe channel : ProgramminWizards.
- You’ll also find the demo for this example and step by step explanations.
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