Java MySQL JList - INSERT SELECT UPDATE DELETE

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.

===

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.

 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

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.

 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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You’ll also find the demo for this example and step by step explanations.

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Java

Java MySQL JList – INSERT SELECT UPDATE DELETE

What we do :

SECTION 1 : Our Database Class

Database CRUD class

SECTION 2 : Our GUI Class

GUI and Main class

LAST SECTION

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What we do :

SECTION 1 : Our Database Class

Database CRUD class

SECTION 2 : Our GUI Class

GUI and Main class

LAST SECTION

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