Model

package binh.dev.data.model;

public class Category {

	private int id;
	private String name;
	private String thumbnail;

	// insert vào
	public Category(String name, String thumbnail) {
		super();
		this.name = name;
		this.thumbnail = thumbnail;
	}

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

	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;
	}

	public String getThumbnail() {
		return thumbnail;
	}

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

DAO Interface

package binh.dev.data.dao;

import java.util.List;

import binh.dev.data.model.Category;

public interface CategoryDao {
	public boolean insert(Category category);
	public boolean update(Category category);
	public boolean delete(int id);
	public Category find(int id);
	public List<Category> findAll();
	public List<Category> hotCategory();
}

DAO Implement

package binh.dev.data.impl;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import binh.dev.data.dao.CategoryDao;
import binh.dev.data.driver.MySQLDriver;
import binh.dev.data.model.Category;

public class CategoryImpl implements CategoryDao {

    Connection con = MySQLDriver.getInstance().getConnection();

    @Override
    public boolean insert(Category category) {
        // TODO Auto-generated method stub
        String sql = "INSERT INTO CATEGORIES VALUES(NULL, ?, ?)";
        try {
            PreparedStatement stmt = con.prepareStatement(sql);
            stmt.setString(1, category.getName());
            stmt.setString(2, category.getThumbnail());

            stmt.execute();
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return false;
    }

    @Override
    public boolean update(Category category) {
        // TODO Auto-generated method stub
        String sql = "UPDATE CATEGORIES SET name = ?, thumbnail = ? WHERE id = ?";
        try {
            PreparedStatement stmt = con.prepareStatement(sql);
            stmt.setString(1, category.getName());
            stmt.setString(2, category.getThumbnail());
            stmt.setInt(3, category.getId());
            return stmt.execute();
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return false;
    }

    @Override
    public boolean delete(int id) {
        // TODO Auto-generated method stub
        String sql = "DELETE FROM CATEGORIES WHERE ID = ?";
        try {
            PreparedStatement stmt = con.prepareStatement(sql);
            stmt.setInt(1, id);

            return stmt.execute();
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return false;
    }

    @Override
    public Category find(int id) {
        // TODO Auto-generated method stub
        String sql = "SELECT * FROM CATEGORIES WHERE ID = ?";
        try {
            PreparedStatement stmt = con.prepareStatement(sql);
            stmt.setInt(1, id);

            ResultSet rs = stmt.executeQuery();
            while (rs.next()) {
                String name = rs.getString("name");
                String thumbnail = rs.getString("thumbnail");

                return new Category(id, name, thumbnail);
            }
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return null;
    }

    @Override
    public List<Category> findAll() {
        // TODO Auto-generated method stub
        List<Category> cateList = new ArrayList<>();
        String sql = "SELECT * FROM CATEGORIES";
        try {
            PreparedStatement stmt = con.prepareStatement(sql);

            ResultSet rs = stmt.executeQuery();
            while (rs.next()) {
                int id = rs.getInt("id");
                String name = rs.getString("name");
                String thumbnail = rs.getString("thumbnail");

                cateList.add(new Category(id, name, thumbnail));
            }
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return cateList;
    }

}