package com.alexnevsky.hotel.dao;
import static com.alexnevsky.hotel.dao.DAOUtil.close;
import static com.alexnevsky.hotel.dao.DAOUtil.prepareStatement;
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 com.alexnevsky.hotel.dao.exception.DAOException;
import com.alexnevsky.hotel.model.Customer;
/**
* This class represents a SQL Database Access Object for the {@link Customer} DTO.
* This DAO should be used as a central point for the mapping between the Admin
* DTO and a SQL database.
*
* @version 1.0 15.05.2011
* @author Alex Nevsky
*/
public final class CustomerDAO {
// Constants ---------------------------------------------------------------
private static final String SQL_FIND_BY_ID = "SELECT `id`, `firstName`, `lastName`, `email`, `phone`, `address`, `CreditCard_number` FROM `Customer` WHERE `id` = ?";
private static final String SQL_LIST_ORDER_BY_ID = "SELECT `id`, `firstName`, `lastName`, `email`, `phone`, `address`, `CreditCard_number` FROM `Customer` ORDER BY `id`";
// Vars --------------------------------------------------------------------
private AbstractDAOFactory daoFactory;
// Constructors ------------------------------------------------------------
/**
* Construct an Customer DAO for the given AbstractDAOFactory.
* Package private so that it can be constructed inside the DAO package only.
*
* @param daoFactory
* The AbstractDAOFactory to construct this Customer DAO for.
*/
CustomerDAO(AbstractDAOFactory daoFactory) {
this.daoFactory = daoFactory;
}
// Actions -----------------------------------------------------------------
/**
* Returns the Customer from the database matching the given ID,
* otherwise null.
*
* @param id
* The ID of the Customer to be returned.
* @return The Customer from the database matching the given ID,
* otherwise null.
* @throws DAOException
* If something fails at database level.
*/
public Customer find(Long id) throws DAOException {
return this.find(SQL_FIND_BY_ID, id);
}
/**
* Returns the Customer from the database matching the given SQL query
* with the given values.
*
* @param sql
* The SQL query to be executed in the database.
* @param values
* The PreparedStatement values to be set.
* @return The Customer from the database matching the given SQL query
* with thegiven values.
* @throws DAOException
* If something fails at database level.
*/
private Customer find(String sql, Object... values) throws DAOException {
Connection connection = null;
PreparedStatement preparedStatement = null;
ResultSet resultSet = null;
Customer customer = null;
try {
connection = this.daoFactory.getConnection();
preparedStatement = prepareStatement(connection, sql, false, values);
resultSet = preparedStatement.executeQuery();
if (resultSet.next()) {
customer = mapCustomer(resultSet);
}
} catch (SQLException e) {
throw new DAOException(e);
} finally {
close(connection, preparedStatement, resultSet);
}
return customer;
}
/**
* Returns a list of all users from the database ordered by Customer ID. The
* list is never null and is empty when the database does not contain any Customer.
*
* @return A list of all users from the database ordered by Customer ID.
* @throws DAOException
* If something fails at database level.
*/
public List<Customer> list() throws DAOException {
Connection connection = null;
PreparedStatement preparedStatement = null;
ResultSet resultSet = null;
List<Customer> users = new ArrayList<Customer>();
try {
connection = this.daoFactory.getConnection();
preparedStatement = connection.prepareStatement(SQL_LIST_ORDER_BY_ID);
resultSet = preparedStatement.executeQuery();
while (resultSet.next()) {
users.add(mapCustomer(resultSet));
}
} catch (SQLException e) {
throw new DAOException(e);
} finally {
close(connection, preparedStatement, resultSet);
}
return users;
}
// Helpers -----------------------------------------------------------------
/**
* Map the current row of the given ResultSet to an Customer.
*
* @param resultSet
* The ResultSet of which the current row is to be mapped
* to an Customer.
* @return The mapped Customer from the current row of the given ResultSet.
* @throws SQLException
* If something fails at database level.
*/
private static Customer mapCustomer(ResultSet resultSet) throws SQLException {
return new Customer(resultSet.getLong("id"), resultSet.getString("firstName"), resultSet.getString("lastName"),
resultSet.getString("email"), resultSet.getString("phone"), resultSet.getString("address"),
resultSet.getLong("CreditCard_number"));
}
}