Nội dung kiến thức:
- Kết nối CSDL -> Java Swing
- CRUD

CSDL: gồm 2 bảng

Mini Project: Xây dựng 1 dự án quản lý sản phẩm gồm có 2 bảng: product & category
1. View CSDL:
2. Chức năng phát triển:
	- UI -> Hiển thị danh sách sản phẩm, thêm, sửa, xoá, tìm kiếm -> product

====================================================================================
Các bước phát triển dự án
B1. Tạo dự án
B2. Tải thư viên jdbc mysql driver maven -> https://mvnrepository.com/artifact/mysql/mysql-connector-java/8.0.26
B3. Add vào dự án -> tai libs, maven (java netbean, java web), ant, gradle (android), composer (laravel), cocospod (ios)
B4. Phân tích dự án:
- Mapping tables -> class objects (models)
- Thiet lap cau hinh ket noi database
- Xay dung CRUD cho chuong trinh -> Lay danh sach, them, sua, xoa du lieu.
	- ProductModify: Danh sach san pham, them, sua, xoa
	- CategoryModify: Danh sach danh muc san pham (them, sua, xoa -> Bai tap)

	- App: ProductFrame -> Quan ly san

#ProductModify.java

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package java2.lesson07;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 *
 * @author Diep.Tran
 */
public class ProductModify {
    public static List<Product> getProductList(String s) {
        List<Product> dataList = new ArrayList<>();
        
        Connection conn = null;
        PreparedStatement statement = null;
        try {
            //Mo ket noi toi database
            conn = DriverManager.getConnection(Config.DB_URL, Config.USERNAME, Config.PASSWORD);
        
            //Truy van du lieu
            String sql = "select product.*, category.id as category_id, category.name as category_name from product "
                    + "left join category on category.id = product.category_id";
            if(s != null && !s.isEmpty()) {
                sql += " where product.title like ?";
            }
            statement = conn.prepareStatement(sql);
            if(s != null && !s.isEmpty()) {
                statement.setString(1, s);
            }
            
            ResultSet resultSet = statement.executeQuery();
            
            while(resultSet.next()) {
                Product p = new Product(
                        resultSet.getInt("id"), 
                        resultSet.getString("title"), 
                        resultSet.getString("thumbnail"), 
                        resultSet.getString("content"), 
                        resultSet.getString("created_at"), 
                        resultSet.getString("updated_at"), 
                        resultSet.getFloat("price"));
                Category c = new Category(
                        resultSet.getInt("category_id"),
                        resultSet.getString("category_name")
                );
                p.setCategory(c);
                
                dataList.add(p);
            }
        } catch (SQLException ex) {
            Logger.getLogger(ProductModify.class.getName()).log(Level.SEVERE, null, ex);
        } finally {
            if(statement != null) {
                try {
                    statement.close();
                } catch (SQLException ex) {
                    Logger.getLogger(ProductModify.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
            if(conn != null) {
                try {
                    conn.close();
                } catch (SQLException ex) {
                    Logger.getLogger(ProductModify.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
        }
        
        return dataList;
    }
    
    public static void save(Product p) {
        if(p.getId() > 0) {
            update(p);
        } else {
            insert(p);
        }
    }
    
    public static void insert(Product p) {
        Connection conn = null;
        PreparedStatement statement = null;
        try {
            //Mo ket noi toi database
            conn = DriverManager.getConnection(Config.DB_URL, Config.USERNAME, Config.PASSWORD);
        
            //Truy van du lieu
            String sql = "insert into product(title, thumbnail, content, price, category_id, created_at, updated_at) "
                    + "values (?, ?, ?, ?, ?, ?, ?)";
            statement = conn.prepareStatement(sql);
            
            Date date = new Date();  
            DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");  
            String strDate = dateFormat.format(date);  
            
            statement.setString(1, p.getTitle());
            statement.setString(2, p.getThumbnail());
            statement.setString(3, p.getContent());
            statement.setFloat(4, p.getPrice());
            statement.setInt(5, p.getCategory().getId());
            statement.setString(6, strDate);
            statement.setString(7, strDate);
            
            statement.execute();
        } catch (SQLException ex) {
            Logger.getLogger(ProductModify.class.getName()).log(Level.SEVERE, null, ex);
        } finally {
            if(statement != null) {
                try {
                    statement.close();
                } catch (SQLException ex) {
                    Logger.getLogger(ProductModify.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
            if(conn != null) {
                try {
                    conn.close();
                } catch (SQLException ex) {
                    Logger.getLogger(ProductModify.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
        }
    }
    
    public static void update(Product p) {
        Connection conn = null;
        PreparedStatement statement = null;
        try {
            //Mo ket noi toi database
            conn = DriverManager.getConnection(Config.DB_URL, Config.USERNAME, Config.PASSWORD);
        
            //Truy van du lieu
            String sql = "update product set title = ?, thumbnail = ?, content = ?, price = ?, category_id = ?, updated_at = ? where id = ?";
            statement = conn.prepareStatement(sql);
            
            Date date = new Date();  
            DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");  
            String strDate = dateFormat.format(date);  
            
            statement.setString(1, p.getTitle());
            statement.setString(2, p.getThumbnail());
            statement.setString(3, p.getContent());
            statement.setFloat(4, p.getPrice());
            statement.setInt(5, p.getCategory().getId());
            statement.setString(6, strDate);
            statement.setInt(7, p.getId());
            
            statement.execute();
        } catch (SQLException ex) {
            Logger.getLogger(ProductModify.class.getName()).log(Level.SEVERE, null, ex);
        } finally {
            if(statement != null) {
                try {
                    statement.close();
                } catch (SQLException ex) {
                    Logger.getLogger(ProductModify.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
            if(conn != null) {
                try {
                    conn.close();
                } catch (SQLException ex) {
                    Logger.getLogger(ProductModify.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
        }
    }
    
    public static void delete(int id) {
        Connection conn = null;
        PreparedStatement statement = null;
        try {
            //Mo ket noi toi database
            conn = DriverManager.getConnection(Config.DB_URL, Config.USERNAME, Config.PASSWORD);
        
            //Truy van du lieu
            String sql = "delete from product where id = ?";
            statement = conn.prepareStatement(sql);
            
            statement.setInt(1, id);
            
            statement.execute();
        } catch (SQLException ex) {
            Logger.getLogger(ProductModify.class.getName()).log(Level.SEVERE, null, ex);
        } finally {
            if(statement != null) {
                try {
                    statement.close();
                } catch (SQLException ex) {
                    Logger.getLogger(ProductModify.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
            if(conn != null) {
                try {
                    conn.close();
                } catch (SQLException ex) {
                    Logger.getLogger(ProductModify.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
        }
    }
}

#ProductFrame.java

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package java2.lesson07;

import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.util.List;
import javax.swing.JOptionPane;
import javax.swing.table.DefaultTableModel;

/**
 *
 * @author Diep.Tran
 */
public class ProductFrame extends javax.swing.JFrame {
    DefaultTableModel tableModel;
    
    List<Product> productList;
    List<Category> categoryList;
    int currentPos = -1;
    
    /**
     * Creates new form ProductFrame
     */
    public ProductFrame() {
        initComponents();
        
        tableModel = (DefaultTableModel) productTable.getModel();
        
        productList = ProductModify.getProductList(null);
        categoryList = CategoryModify.getCategoryList();
        
        showData();
        
        for (Category category : categoryList) {
            categoryCb.addItem(category);
        }
        
        productTable.addMouseListener(new MouseListener() {
            @Override
            public void mouseClicked(MouseEvent e) {
                currentPos = productTable.getSelectedRow();
                
                titleTxt.setText(productList.get(currentPos).getTitle());
                priceTxt.setText(productList.get(currentPos).getPrice() + "");
                desTxt.setText(productList.get(currentPos).getContent());
                thumbnailTxt.setText(productList.get(currentPos).getThumbnail());
                
                for (Category category : categoryList) {
                    if(category.getId() == productList.get(currentPos).getId()) {
                        categoryCb.setSelectedItem(category);
                        break;
                    }
                }
            }

            @Override
            public void mousePressed(MouseEvent e) {
            }

            @Override
            public void mouseReleased(MouseEvent e) {
            }

            @Override
            public void mouseEntered(MouseEvent e) {
            }

            @Override
            public void mouseExited(MouseEvent e) {
            }
        });
    }
    
    private void showData() {
        tableModel.setRowCount(0);
        
        for (Product product : productList) {
            tableModel.addRow(new Object[] {
                tableModel.getRowCount() + 1,
                product.getTitle(),
                product.getPrice(),
                product.getCategory().getName()
            });
        }
    }
    
    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">//GEN-BEGIN:initComponents
    private void initComponents() {

        jPanel1 = new javax.swing.JPanel();
        jLabel1 = new javax.swing.JLabel();
        titleTxt = new javax.swing.JTextField();
        jLabel2 = new javax.swing.JLabel();
        priceTxt = new javax.swing.JTextField();
        jLabel3 = new javax.swing.JLabel();
        thumbnailTxt = new javax.swing.JTextField();
        jLabel4 = new javax.swing.JLabel();
        categoryCb = new javax.swing.JComboBox<>();
        jLabel5 = new javax.swing.JLabel();
        jScrollPane1 = new javax.swing.JScrollPane();
        desTxt = new javax.swing.JTextArea();
        saveBtn = new javax.swing.JButton();
        delBtn = new javax.swing.JButton();
        searchBtn = new javax.swing.JButton();
        jScrollPane2 = new javax.swing.JScrollPane();
        productTable = new javax.swing.JTable();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        jPanel1.setBorder(javax.swing.BorderFactory.createTitledBorder("NHAP THONG TIN SAN PHAM"));

        jLabel1.setText("Ten SP:");

        jLabel2.setText("Gia:");

        jLabel3.setText("Hinh Anh:");

        jLabel4.setText("Danh Muc SP:");

        jLabel5.setText("Mo Ta:");

        desTxt.setColumns(20);
        desTxt.setRows(5);
        jScrollPane1.setViewportView(desTxt);

        saveBtn.setText("Luu");
        saveBtn.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                saveBtnActionPerformed(evt);
            }
        });

        delBtn.setText("Xoa");
        delBtn.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                delBtnActionPerformed(evt);
            }
        });

        searchBtn.setText("Tim Kiem");
        searchBtn.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                searchBtnActionPerformed(evt);
            }
        });

        javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
        jPanel1.setLayout(jPanel1Layout);
        jPanel1Layout.setHorizontalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel1Layout.createSequentialGroup()
                .addGap(19, 19, 19)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(jPanel1Layout.createSequentialGroup()
                        .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addComponent(jLabel3)
                            .addComponent(jLabel4)
                            .addComponent(jLabel5))
                        .addGap(18, 18, 18)
                        .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()
                                .addComponent(thumbnailTxt, javax.swing.GroupLayout.PREFERRED_SIZE, 296, javax.swing.GroupLayout.PREFERRED_SIZE)
                                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
                            .addGroup(jPanel1Layout.createSequentialGroup()
                                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                                    .addComponent(categoryCb, 0, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                                    .addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 296, Short.MAX_VALUE))
                                .addGap(0, 0, Short.MAX_VALUE))))
                    .addGroup(jPanel1Layout.createSequentialGroup()
                        .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
                            .addGroup(jPanel1Layout.createSequentialGroup()
                                .addComponent(jLabel2)
                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                                .addComponent(priceTxt, javax.swing.GroupLayout.PREFERRED_SIZE, 296, javax.swing.GroupLayout.PREFERRED_SIZE))
                            .addGroup(jPanel1Layout.createSequentialGroup()
                                .addComponent(jLabel1)
                                .addGap(56, 56, 56)
                                .addComponent(titleTxt, javax.swing.GroupLayout.PREFERRED_SIZE, 296, javax.swing.GroupLayout.PREFERRED_SIZE)))
                        .addGap(31, 31, 31)
                        .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                            .addComponent(searchBtn, javax.swing.GroupLayout.DEFAULT_SIZE, 100, Short.MAX_VALUE)
                            .addComponent(delBtn, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                            .addComponent(saveBtn, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
                        .addContainerGap(22, Short.MAX_VALUE))))
        );
        jPanel1Layout.setVerticalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel1Layout.createSequentialGroup()
                .addGap(18, 18, 18)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel1)
                    .addComponent(titleTxt, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(saveBtn))
                .addGap(18, 18, 18)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel2)
                    .addComponent(priceTxt, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(delBtn))
                .addGap(18, 18, 18)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel3)
                    .addComponent(thumbnailTxt, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(searchBtn))
                .addGap(18, 18, 18)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel4)
                    .addComponent(categoryCb, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(jPanel1Layout.createSequentialGroup()
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                        .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 79, javax.swing.GroupLayout.PREFERRED_SIZE))
                    .addGroup(jPanel1Layout.createSequentialGroup()
                        .addGap(37, 37, 37)
                        .addComponent(jLabel5)))
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );

        productTable.setModel(new javax.swing.table.DefaultTableModel(
            new Object [][] {

            },
            new String [] {
                "STT", "Ten SP", "Gia", "Danh Muc SP"
            }
        ) {
            boolean[] canEdit = new boolean [] {
                false, false, false, false
            };

            public boolean isCellEditable(int rowIndex, int columnIndex) {
                return canEdit [columnIndex];
            }
        });
        jScrollPane2.setViewportView(productTable);
        if (productTable.getColumnModel().getColumnCount() > 0) {
            productTable.getColumnModel().getColumn(0).setResizable(false);
            productTable.getColumnModel().getColumn(1).setResizable(false);
            productTable.getColumnModel().getColumn(2).setResizable(false);
            productTable.getColumnModel().getColumn(3).setResizable(false);
        }

        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()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                    .addComponent(jScrollPane2))
                .addContainerGap())
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(18, 18, 18)
                .addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, 169, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );

        pack();
    }// </editor-fold>//GEN-END:initComponents

    private void saveBtnActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_saveBtnActionPerformed
        // TODO add your handling code here:
        String title = titleTxt.getText();
        String thumbnail = thumbnailTxt.getText();
        float price = Float.parseFloat(priceTxt.getText());
        String content = desTxt.getText();
        Category category = (Category) categoryCb.getSelectedItem();
        
        Product p;
        if(currentPos >= 0) {
            p = productList.get(currentPos);
            currentPos = -1;
            
            p.setTitle(title);
            p.setThumbnail(thumbnail);
            p.setContent(content);
            p.setPrice(price);
            p.setCategory(category);
        } else {
            p = new Product(title, thumbnail, content, price, category);
        }
        
        ProductModify.save(p);
        
        productList = ProductModify.getProductList(null);
        showData();
        
        titleTxt.setText("");
        thumbnailTxt.setText("");
        desTxt.setText("");
        priceTxt.setText("");
    }//GEN-LAST:event_saveBtnActionPerformed

    private void delBtnActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_delBtnActionPerformed
        // TODO add your handling code here:
        if(currentPos == -1) {
            JOptionPane.showMessageDialog(rootPane, "Ban chua chon san pham can xoa, vui long kiem tra lai.");
            return;
        }
        int option = JOptionPane.showConfirmDialog(rootPane, "Ban chac chan muon xoa san pham nay khong?");
        
        if(option == 0) {
            ProductModify.delete(productList.get(currentPos).getId());
            productList.remove(currentPos);
            currentPos = -1;
            
            showData();
        }
        
        titleTxt.setText("");
        thumbnailTxt.setText("");
        desTxt.setText("");
        priceTxt.setText("");
    }//GEN-LAST:event_delBtnActionPerformed

    private void searchBtnActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_searchBtnActionPerformed
        // TODO add your handling code here:
        String titleSearch = JOptionPane.showInputDialog("Nhap ten san pham can tim kiem");
        if(titleSearch == null || titleSearch.isEmpty()) {
            productList = ProductModify.getProductList(null);
        } else {
            productList = ProductModify.getProductList("%" + titleSearch + "%");
        }
        
        showData();
    }//GEN-LAST:event_searchBtnActionPerformed

    /**
     * @param args the command line arguments
     */
    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(ProductFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(ProductFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(ProductFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(ProductFrame.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 ProductFrame().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify//GEN-BEGIN:variables
    private javax.swing.JComboBox<Category> categoryCb;
    private javax.swing.JButton delBtn;
    private javax.swing.JTextArea desTxt;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JLabel jLabel3;
    private javax.swing.JLabel jLabel4;
    private javax.swing.JLabel jLabel5;
    private javax.swing.JPanel jPanel1;
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JScrollPane jScrollPane2;
    private javax.swing.JTextField priceTxt;
    private javax.swing.JTable productTable;
    private javax.swing.JButton saveBtn;
    private javax.swing.JButton searchBtn;
    private javax.swing.JTextField thumbnailTxt;
    private javax.swing.JTextField titleTxt;
    // End of variables declaration//GEN-END:variables
}

#Product.java

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package java2.lesson07;

/**
 *
 * @author Diep.Tran
 */
public class Product {
    int id;
    String title, thumbnail, content, createdAt, updatedAt;
    float price;
    Category category;

    public Product() {
    }

    public Product(String title, String thumbnail, String content, float price, Category category) {
        this.title = title;
        this.thumbnail = thumbnail;
        this.content = content;
        this.price = price;
        this.category = category;
    }
    
    public Product(int id, String title, String thumbnail, String content, String createdAt, String updatedAt, float price) {
        this.id = id;
        this.title = title;
        this.thumbnail = thumbnail;
        this.content = content;
        this.createdAt = createdAt;
        this.updatedAt = updatedAt;
        this.price = price;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public String getThumbnail() {
        return thumbnail;
    }

    public void setThumbnail(String thumbnail) {
        this.thumbnail = thumbnail;
    }

    public String getContent() {
        return content;
    }

    public void setContent(String content) {
        this.content = content;
    }

    public String getCreatedAt() {
        return createdAt;
    }

    public void setCreatedAt(String createdAt) {
        this.createdAt = createdAt;
    }

    public String getUpdatedAt() {
        return updatedAt;
    }

    public void setUpdatedAt(String updatedAt) {
        this.updatedAt = updatedAt;
    }

    public float getPrice() {
        return price;
    }

    public void setPrice(float price) {
        this.price = price;
    }

    public Category getCategory() {
        return category;
    }

    public void setCategory(Category category) {
        this.category = category;
    }
}

#Config.java

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package java2.lesson07;

/**
 *
 * @author Diep.Tran
 */
public interface Config {
    String DB_URL = "jdbc:mysql://localhost:3306/C2010G";
    String USERNAME = "root";
    String PASSWORD = "";
}

#CategoryModify.java

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package java2.lesson07;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 *
 * @author Diep.Tran
 */
public class CategoryModify {
    public static List<Category> getCategoryList() {
        List<Category> dataList = new ArrayList<>();
        
        Connection conn = null;
        PreparedStatement statement = null;
        try {
            //Mo ket noi toi database
            conn = DriverManager.getConnection(Config.DB_URL, Config.USERNAME, Config.PASSWORD);
        
            //Truy van du lieu
            String sql = "select * from category";
            statement = conn.prepareStatement(sql);
            
            ResultSet resultSet = statement.executeQuery();
            
            while(resultSet.next()) {
                Category c = new Category(
                        resultSet.getInt("id"),
                        resultSet.getString("name")
                );
                
                dataList.add(c);
            }
        } catch (SQLException ex) {
            Logger.getLogger(ProductModify.class.getName()).log(Level.SEVERE, null, ex);
        } finally {
            if(statement != null) {
                try {
                    statement.close();
                } catch (SQLException ex) {
                    Logger.getLogger(ProductModify.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
            if(conn != null) {
                try {
                    conn.close();
                } catch (SQLException ex) {
                    Logger.getLogger(ProductModify.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
        }
        
        return dataList;
    }
}

#Category.java

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package java2.lesson07;

/**
 *
 * @author Diep.Tran
 */
public class Category {
    int id;
    String name;

    public Category() {
    }

    public Category(int id, String name) {
        this.id = id;
        this.name = name;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    @Override
    public String toString() {
        return name;
    }
}