Capa datos (II)

package com.trifulcas.datos;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.ArrayList;
import java.util.List;

public class ActorDAO {

	private Connection con;
	private int max_records=1000;
	public ActorDAO() {
		try {
			Class.forName("com.mysql.cj.jdbc.Driver");
			con = DriverManager.getConnection("jdbc:mysql://localhost:3306/sakila", "root", "");

		} catch (Exception ex) {
			System.out.println(ex);
		}
	}

	public Actor getActor(int id) {
		Actor res = null;
		try {
			String sql = "select * from actor where actor_id=?" ;
			PreparedStatement stmt = con.prepareStatement(sql);

			stmt.setInt(1, id);

			ResultSet rs = stmt.executeQuery();
			if (rs.next()) {
				res = new Actor(rs.getInt("actor_id"), rs.getString("first_name"),rs.getString("last_name"),rs.getDate("last_update"));
			}

		} catch (Exception ex) {
			System.out.println(ex);
		}
		return res;
	}
	
	public List<Actor> getActors(int limite){
		List<Actor> res=new ArrayList<Actor>();
		try {
			String sql = "select * from actor limit ?" ;
			PreparedStatement stmt = con.prepareStatement(sql);
			stmt.setInt(1, limite);
			ResultSet rs = stmt.executeQuery();
			while (rs.next()) {
				Actor temp = new Actor(rs.getInt("actor_id"), rs.getString("first_name"),rs.getString("last_name"),rs.getDate("last_update"));
				res.add(temp);
			}

		} catch (Exception ex) {
			System.out.println(ex);
		}
		return res;
	}
	public List<Actor> getActors(){
		return getActors(max_records);
	}

/**
	 * Devuelve un arraylist de actores cuyo apellido contenga la cadena que le pasamos
	 * @param cad cadena a buscar
	 * @return ArrayList de actores
	 */
	public List<Actor> getActors(String cad) {
		List<Actor> res = new ArrayList<Actor>();
		try {
			String sql = "select * from actor where last_name like ?";
			PreparedStatement stmt = con.prepareStatement(sql);
			stmt.setString(1, '%'+cad+'%');
			ResultSet rs = stmt.executeQuery();
			while (rs.next()) {
				Actor temp = new Actor(rs.getInt("actor_id"), rs.getString("first_name"), rs.getString("last_name"),
						rs.getDate("last_update"));
				res.add(temp);
			}

		} catch (Exception ex) {
			System.out.println(ex);
		}
		return res;
	}


	public boolean addActor(Actor actor) {
		try {
			String sql = "insert into actor (first_name, last_name) values (?,?)" ;
			PreparedStatement stmt = con.prepareStatement(sql);
			stmt.setString(1, actor.getFirst_name());
			stmt.setString(2, actor.getLast_name());
			int res=stmt.executeUpdate();
			return res==1;
		} catch (Exception ex) {
			System.out.println(ex);
		}
		return false;
	}
	
	public boolean updateActor(Actor actor) {
		try {
			String sql = "update actor set first_name=?, last_name=? where actor_id=?" ;
			PreparedStatement stmt = con.prepareStatement(sql);
			stmt.setString(1, actor.getFirst_name());
			stmt.setString(2, actor.getLast_name());
			stmt.setInt(3, actor.getActor_id());
			int res=stmt.executeUpdate();
			return res==1;
		} catch (Exception ex) {
			System.out.println(ex);
		}
		return false;
	}
	
	public boolean deleteActor(Actor actor) {
		try {
			return deleteActor(actor.getActor_id());
		} catch (Exception ex) {
			System.out.println(ex);
		}
		return false;
	}
	
	public boolean deleteActor(int actor_id) {
		try {
			String sql = "delete from actor where actor_id=?" ;
			PreparedStatement stmt = con.prepareStatement(sql);
			stmt.setInt(1, actor_id);
			int res=stmt.executeUpdate();
			return res==1;
		} catch (Exception ex) {
			System.out.println(ex);
		}
		return false;
	}

}

package com.trifulcas.datos;

import java.util.List;

public class AccesoDAO {

	public static void main(String[] args) {
		
		// He abstraído la base de datos
		// Sólo tengo que crear una instancia de mi capa de Datos
		ActorDAO bd=new ActorDAO();
		
		// Trabajo exclusivamente con POJO no con registros de la base de datos
		// Que hasta desconozco o no me interesa como están implementados
		Actor penelope=bd.getActor(1);
		
		System.out.println(penelope.getFirst_name());

		// Obtengo todos los actores en una lista y recorro la lista
		List<Actor> actores=bd.getActors(20);
		for(Actor actor:actores) {
			System.out.println(actor);
		}
		
		// Para añadir creo un actor nuevo y después llamo a la capa DAO para añadirlo
		Actor nuevo=new Actor(1,"wilfredo","etxevarria",null);
		if(bd.addActor(nuevo)) {
			System.out.println("Actor "+nuevo+" añadido");
		}
		
		// Modifico un actor
		penelope.setLast_name("Campofrío");
		bd.updateActor(penelope);
		
		// Elimino el actor concreto o por id
		Actor w=bd.getActor(320);
		bd.deleteActor(w);
		bd.deleteActor(321);
	}

}