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/*
* Created on 25.11.2004 by HS
*
*/
package de.laliluna.library.bl;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import org.hibernate.Session;
import org.hibernate.Transaction;
import de.laliluna.library.Book;
import de.laliluna.library.Customer;
import de.laliluna.library.HibernateSessionFactory;
/**
* @author HS
*
*
*/
public class LibraryManager {
/**
* get all books from the database
*
* @return Array of BookValue
*/
public Book[] getAllBooks() {
/* will hold the books we are going to return later */
List books = new ArrayList();
/* a Hibernate session */
Session session = null;
/* we always need a transaction */
Transaction tx = null;
/* get session of the current thread */
session = HibernateSessionFactory.currentSession();
tx = session.beginTransaction();
List tmpBooks = session.createQuery(
"select b from Book as b order by b.author, b.title").list();
for (Iterator iter = tmpBooks.iterator(); iter.hasNext();) {
books.add((Book) iter.next());
}
tx.commit();
return (Book[]) books.toArray(new Book[0]);
}
/**
* get book by primary key
*
* @param primaryKey
* @return a Book or null
*/
public Book getBookByPrimaryKey(Integer primaryKey) {
/* holds our return value */
Book book = null;
/* a Hibernate session */
Session session = null;
/* we always need a transaction */
Transaction tx = null;
/* get session of the current thread */
session = HibernateSessionFactory.currentSession();
tx = session.beginTransaction();
book = (Book) session.get(Book.class, primaryKey);
tx.commit();
return book;
}
/**
* sets the book as borrowed to the user specified in the database
*
* @param primaryKey
* @param userPrimaryKey
*/
public void borrowBook(Integer primaryKey, Integer customerPrimaryKey) {
/* a Hibernate session */
Session session = null;
/* we always need a transaction */
Transaction tx = null;
/* get session of the current thread */
session = HibernateSessionFactory.currentSession();
tx = session.beginTransaction();
Book book = (Book) session.get(Book.class, primaryKey);
// only if borrowing of the book is allowed
if (book.getBorrowallowed()) {
Customer customer = (Customer) session.get(Customer.class,
customerPrimaryKey);
if (book != null && customer != null)
book.setCustomer(customer);
}
tx.commit();
}
/**
* customer returns a book, relation in the db between customer and book is
* deleted
*
* @param primaryKey
*/
public void returnBook(Integer primaryKey) {
/* a Hibernate session */
Session session = null;
/* we always need a transaction */
Transaction tx = null;
/* get session of the current thread */
session = HibernateSessionFactory.currentSession();
tx = session.beginTransaction();
Book book = (Book) session.get(Book.class, primaryKey);
if (book != null) {
// session.get returns null when no entry is found
Customer customer = book.getCustomer();
if (customer != null) {
customer.getBooks().remove(book);
book.setCustomer(null);
}
}
tx.commit();
}
/**
* updates/creates a book
*
* @param bookValue
*/
public void saveBook(Book bookValue) {
/* a Hibernate session */
Session session = null;
/* we always need a transaction */
Transaction tx = null;
/* get session of the current thread */
session = HibernateSessionFactory.currentSession();
tx = session.beginTransaction();
Book book;
if (bookValue.getId() != null && bookValue.getId().intValue() != 0) { // [laliluna]
// 04.12.2004
// load
// book
// from
// DB
book = (Book) session.get(Book.class, bookValue.getId());
if (book != null) {
book.setAuthor(bookValue.getAuthor());
book.setTitle(bookValue.getTitle());
book.setBorrowallowed(bookValue.getBorrowallowed());
session.update(book);
}
} else // [laliluna] 04.12.2004 create new book
{
book = new Book();
book.setAuthor(bookValue.getAuthor());
book.setTitle(bookValue.getTitle());
book.setBorrowallowed(bookValue.getBorrowallowed());
session.save(book);
}
tx.commit();
}
/**
* deletes a book
*
* @param primaryKey
*/
public void removeBookByPrimaryKey(Integer primaryKey) {
/* a Hibernate session */
Session session = null;
/* we always need a transaction */
Transaction tx = null;
/* get session of the current thread */
session = HibernateSessionFactory.currentSession();
tx = session.beginTransaction();
Book book = (Book) session.get(Book.class, primaryKey);
if (book != null)
if (book.getCustomer() != null)
book.getCustomer().getBooks().remove(book);
session.delete(book);
tx.commit();
}
/**
* returns all customers from the db
*
* @return
*/
public Customer[] getAllCustomers() {
/* will hold the books we are going to return later */
List customers = new ArrayList();
/* a Hibernate session */
Session session = null;
/* we always need a transaction */
Transaction tx = null;
/* get session of the current thread */
session = HibernateSessionFactory.currentSession();
tx = session.beginTransaction();
List tmpCustomer = session.createQuery(
"select c from Customer as c order by c.lastname").list();
for (Iterator iter = tmpCustomer.iterator(); iter.hasNext();) {
customers.add((Customer) iter.next());
}
tx.commit();
return (Customer[]) customers.toArray(new Customer[0]);
}
/**
* gets a customer from the db
*
* @param primaryKey
* @return the customer class or null, when no customer is found
*/
public Customer getCustomerByPrimaryKey(Integer primaryKey) {
/* holds our return value */
Customer customer = null;
/* a Hibernate session */
Session session = null;
/* we always need a transaction */
Transaction tx = null;
/* get session of the current thread */
session = HibernateSessionFactory.currentSession();
tx = session.beginTransaction();
customer = (Customer) session.get(Customer.class, primaryKey);
tx.commit();
return customer;
}
/**
* saves the customers to the db
*
* @param customer
*/
public void saveCustomer(Customer customer) {
/* a Hibernate session */
Session session = null;
/* we always need a transaction */
Transaction tx = null;
/* get session of the current thread */
session = HibernateSessionFactory.currentSession();
tx = session.beginTransaction();
if (customer.getId() == null || customer.getId().intValue() == 0) // [laliluna]
// 06.12.2004
// create
// customer
session.save(customer);
else {
Customer toBeUpdated = (Customer) session.get(Customer.class,
customer.getId());
toBeUpdated.setAge(customer.getAge());
toBeUpdated.setLastname(customer.getLastname());
toBeUpdated.setFirstname(customer.getFirstname());
session.update(toBeUpdated);
}
tx.commit();
}
/**
* deletes a customer from the database
*
* @param primaryKey
*/
public void removeCustomerByPrimaryKey(Integer primaryKey) {
/* a Hibernate session */
Session session = null;
/* we always need a transaction */
Transaction tx = null;
/* get session of the current thread */
session = HibernateSessionFactory.currentSession();
tx = session.beginTransaction();
Customer customer = (Customer) session.get(Customer.class, primaryKey);
if (customer != null) {
Set books = customer.getBooks();
for (Iterator iter = books.iterator(); iter.hasNext();) {
Book element = (Book) iter.next();
element.setCustomer(null);
}
session.delete(customer);
}
tx.commit();
}
} |
Probléme d'utilisation de Struts et Hibernate ensemble.
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