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iluwatar#107 Dao example JavaDoc
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‎dao/src/main/java/com/iluwatar/dao/App.java‎

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package com.iluwatar.dao;
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import java.util.ArrayList;
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import java.util.List;
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/**
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*
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* With the DAO pattern, we can use various method calls to retrieve/add/delete/update data without directly
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* interacting with the data. The below example demonstrates basic operations(CRUD): select, add, update, and delete.
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*/
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public class App {
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public static void main(String[] args) {
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CustomerDaoImpl customerDao = new CustomerDaoImpl(generateSampleCustomers());
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System.out.println("customerDao.getAllCustomers(): " + customerDao.getAllCustomers());
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System.out.println("customerDao.getCusterById(2): " + customerDao.getCusterById(2));
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Customer customer = new Customer(4, "Dan", "Danson");
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customerDao.addCustomer(customer);
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System.out.println("customerDao.getAllCustomers(): " + customerDao.getAllCustomers());
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customer.setFirstName("Daniel");
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customer.setLastName("Danielson");
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customerDao.updateCustomer(customer);
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System.out.println("customerDao.getAllCustomers(): " + customerDao.getAllCustomers());
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customerDao.deleteCustomer(customer);
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System.out.println("customerDao.getAllCustomers(): " + customerDao.getAllCustomers());
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}
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public static List<Customer> generateSampleCustomers() {
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Customer customer1 = new Customer(1, "Adam", "Adamson");
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Customer customer2 = new Customer(2, "Bob", "Bobson");
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Customer customer3 = new Customer(3, "Carl", "Carlson");
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List<Customer> customers = new ArrayList<Customer>();
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customers.add(customer1);
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customers.add(customer2);
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customers.add(customer3);
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return customers;
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}
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}
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package com.iluwatar.dao;
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import java.util.ArrayList;
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import java.util.List;
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/**
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*
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* With the DAO pattern, we can use various method calls to retrieve/add/delete/update data without directly
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* interacting with the data. The below example demonstrates basic operations(CRUD): select, add, update, and delete.
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*
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*/
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public class App {
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/**
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* Program entry point
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* @param args command line args
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*/
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public static void main(String[] args) {
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CustomerDaoImpl customerDao = new CustomerDaoImpl(generateSampleCustomers());
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System.out.println("customerDao.getAllCustomers(): " + customerDao.getAllCustomers());
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System.out.println("customerDao.getCusterById(2): " + customerDao.getCusterById(2));
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Customer customer = new Customer(4, "Dan", "Danson");
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customerDao.addCustomer(customer);
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System.out.println("customerDao.getAllCustomers(): " + customerDao.getAllCustomers());
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customer.setFirstName("Daniel");
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customer.setLastName("Danielson");
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customerDao.updateCustomer(customer);
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System.out.println("customerDao.getAllCustomers(): " + customerDao.getAllCustomers());
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customerDao.deleteCustomer(customer);
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System.out.println("customerDao.getAllCustomers(): " + customerDao.getAllCustomers());
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}
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/**
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* Generate customers
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* @return list of customers
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*/
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public static List<Customer> generateSampleCustomers() {
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Customer customer1 = new Customer(1, "Adam", "Adamson");
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Customer customer2 = new Customer(2, "Bob", "Bobson");
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Customer customer3 = new Customer(3, "Carl", "Carlson");
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List<Customer> customers = new ArrayList<Customer>();
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customers.add(customer1);
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customers.add(customer2);
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customers.add(customer3);
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return customers;
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}
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}

‎dao/src/main/java/com/iluwatar/dao/Customer.java‎

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package com.iluwatar.dao;
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/**
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*
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* Customer
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*
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*/
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public class Customer {
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private int id;
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private String firstName;
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private String lastName;

‎dao/src/main/java/com/iluwatar/dao/CustomerDao.java‎

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import java.util.List;
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/**
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*
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* CustomerDao
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*
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*/
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public interface CustomerDao {
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public List<Customer> getAllCustomers();
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public Customer getCusterById(int id);
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public void addCustomer(Customer customer);

‎dao/src/main/java/com/iluwatar/dao/CustomerDaoImpl.java‎

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import java.util.List;
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/**
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*
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* The data access object (DAO) is an object that provides an abstract interface to some type of database or other persistence mechanism.
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* By mapping application calls to the persistence layer, DAO provide some specific data operations without exposing details of the database.
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* This isolation supports the Single responsibility principle. It separates what data accesses the application needs, in terms of
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* domain-specific objects and data types (the public interface of the DAO), from how these needs can be satisfied with a specific DBMS,
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* database schema, etc.
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*
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*/
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public class CustomerDaoImpl implements CustomerDao {
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‎dao/src/test/java/com/iluwatar/dao/AppTest.java‎

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package com.iluwatar.dao;
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import org.junit.Test;
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import com.iluwatar.dao.App;
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public class AppTest {
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@Test
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public void test() {
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String[] args = {};
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App.main(args);
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}
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}
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package com.iluwatar.dao;
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import org.junit.Test;
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import com.iluwatar.dao.App;
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/**
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*
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* Application test
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*
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*/
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public class AppTest {
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@Test
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public void test() {
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String[] args = {};
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App.main(args);
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}
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}

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