public class Book implements Serializable{private int id;private String name;private String author;private double price;private Date pubDate;public Book() {}public Book(String name, String author, double price, Date pubDate) {super();this.name = name;this.author = author;this.price = price;this.pubDate = pubDate;}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 getAuthor() {return author;}public void setAuthor(String author) {this.author = author;}public double getPrice() {return price;}public void setPrice(double price) {this.price = price;}public Date getPubDate() {return pubDate;}public void setPubDate(Date pubDate) {this.pubDate = pubDate;}@Overridepublic String toString() {return "Book [id=" + id + ", name=" + name + ", author=" + author + ", price=" + price + ", pubDate=" + pubDate+ "]";}
}

public class Category implements Serializable{private int id;private String name;private List<Book> books = new ArrayList<>();public Category() {}public Category(String name) {super();this.name = name;}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 List<Book> getBooks() {return books;}public void setBooks(List<Book> books) {this.books = books;}
}

<hibernate-mapping package="cn.sxt.pojo"><class name="Book" table="t_book"><id name="id"><generator class="native"></generator></id><property name="name"/><property name="author"/><property name="price"/><property name="pubDate"/></class>
</hibernate-mapping>

<hibernate-mapping package="cn.sxt.pojo"><class name="Category" table="t_category"><id name="id"><generator class="native"></generator></id><property name="name"/><!-- 一对多的关联映射 --><list name="books"><key column="cid"></key><!-- idx有hibernate来进行维护 --><index column="idx"/><one-to-many class="Book"/></list></class>
</hibernate-mapping>

public class HibernateTest {/*** 生成数据库表的工具方法* */@Testpublic void testCreateDB(){Configuration cfg = new Configuration().configure();SchemaExport se = new SchemaExport(cfg);//第一个参数  是否打印sql脚本//第二个参数 是否将脚本导出到数据库中执行se.create(true, true);}/*** 初始化表数据* 使用一对多的方式来保存数据，会执行update语句来更新外键* 使得效率会比多对一的方式效率低*/@Testpublic void testInit(){Session session = null;Transaction tx = null;try {session = HibernateUtil.getSession();tx = session.beginTransaction();Category c1 = new Category("计算机类");Category c2 = new Category("文学");Category c3 = new Category("历史");SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");Book b1 = new Book("java","sun",30,df.parse("1995-05-23"));Book b2 = new Book("struts","apache",40,df.parse("2006-09-12"));Book b3 = new Book("明朝那些事儿","当年明月",70,df.parse("2008-05-23"));Book b4 = new Book("水浒传","老撕",20,df.parse("1985-05-23"));//设置关系
            c1.getBooks().add(b1);c1.getBooks().add(b2);c2.getBooks().add(b4);c3.getBooks().add(b3);session.save(c1);session.save(c2);session.save(c3);session.save(b1);session.save(b2);session.save(b3);session.save(b4);tx.commit();} catch (Exception e) {if(tx!=null)tx.rollback();}finally {HibernateUtil.close();}}/*** 在查询多的一端数据时可以获取一的一端的数据*/@Testpublic void testGetData(){Session session = HibernateUtil.getSession();Category c1 = (Category)session.get(Category.class, 1);System.out.println(c1.getId()+"----"+c1.getName());System.out.println("-----------------");for(Book book:c1.getBooks()){System.out.println(book);}HibernateUtil.close();}
}