本例以Windows, JDK1.8, MySQL5 为基础，演示使用Hibernate5以注解的方式完成一对多的关系映射。

使用的工具及技术

1.Hibernate 5.2.10.Final
2.MySQL 5
3.Eclipse
4.Maven 3

一对多表的映射

Model

分别创建Person和Book两个Model对象，以Student的”P_ID”作为Book里的外键, 一个人对应多个Book。

Person.java

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package com.devnp.hibernate.association.otm.model;

import java.util.HashSet;
import java.util.Set;

import javax.persistence.Basic;
import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.OneToMany;
import javax.persistence.Table;

@Entity
@Table(name = "Person")
public class Person {

	@Id
	@GeneratedValue(strategy = GenerationType.IDENTITY)
	@Basic(optional = false)
	@Column(name = "P_ID")
	private Long pId ;
	
	@Column(name = "NAME")
	private String name ;
	
	@Column(name = "AGE", nullable= false)
	private Integer age ;
	
	@OneToMany(fetch = FetchType.LAZY, mappedBy = "person", cascade=CascadeType.ALL)
	private Set<Book> books = new HashSet<Book>();
	
	public Person() {
		super();
	}
	
	public Person(String name, Integer age) {
		super();
		this.name = name;
		this.age = age;
	}

	public Long getpId() {
		return pId;
	}

	public void setpId(Long pId) {
		this.pId = pId;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public Integer getAge() {
		return age;
	}

	public void setAge(Integer age) {
		this.age = age;
	}

	public Set<Book> getBooks() {
		return books;
	}

	public void setBooks(Set<Book> books) {
		this.books = books;
	}

	@Override
	public String toString() {
		return "Person [pId=" + pId + ", name=" + name + ", age=" + age +"]";
	}
	
}

Book.java

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package com.devnp.hibernate.association.otm.model;

import javax.persistence.Basic;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.Table;

@Entity
@Table(name = "Book")
public class Book {
	
	@Id
	@GeneratedValue(strategy = GenerationType.IDENTITY)
	@Basic(optional = false)
	@Column(name = "B_ID")
	private Long bId ;
	
	@Column(name = "B_NAME")
	private String bName ;
	
	@Column(name = "B_PRICE")
	private Double price ;
	
	@ManyToOne(fetch = FetchType.LAZY)
	@JoinColumn(name = "P_ID", nullable = false)
	private Person person ;
	
	public Book() {
		super();
	}
	
	public Book(String bName, Double price, Person person) {
		super();
		this.bName = bName;
		this.price = price;
		this.person = person ;
	}


	public Long getbId() {
		return bId;
	}

	public void setbId(Long bId) {
		this.bId = bId;
	}

	public String getbName() {
		return bName;
	}

	public void setbName(String bName) {
		this.bName = bName;
	}

	public Double getPrice() {
		return price;
	}

	public void setPrice(Double price) {
		this.price = price;
	}

	public Person getPerson() {
		return person;
	}

	public void setPerson(Person person) {
		this.person = person;
	}

	@Override
	public String toString() {
		return "Book [bId=" + bId + ", bName=" + bName + ", price=" + price + "]";
	}
	
}

Hibernate SessionFactory

本例以属性配置的加载，更多获取SessionFactory的方式：Hibernate5 SessionFactory 的获取

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package com.devnp.hibernate.util;

import java.util.Properties;

import org.hibernate.SessionFactory;
import org.hibernate.boot.Metadata;
import org.hibernate.boot.MetadataSources;
import org.hibernate.boot.model.naming.ImplicitNamingStrategyJpaCompliantImpl;
import org.hibernate.boot.registry.StandardServiceRegistry;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;

import com.devnp.hibernate.association.otm.model.Book;
import com.devnp.hibernate.association.otm.model.Person;
import com.devnp.hibernate.association.oto.model.Student;
import com.devnp.hibernate.association.oto.model.Transcripts;

public class HibernateProUtil {

	private static SessionFactory sessionFactory = buildSessionFactory();

	private static SessionFactory buildSessionFactory() {
		Properties properties = new Properties();
	    properties.put("hibernate.dialect","org.hibernate.dialect.MySQL5InnoDBDialect"); //数据库方言
	    properties.put("hibernate.show_sql", "true");	//是否打印SQL
	    properties.put("hibernate.hbm2ddl.auto","update"); //执行跟新，及如果表不存在则会自动创建表
	    
	    properties.put("hibernate.format_sql", "true"); //格式化
	    
	    properties.put("hibernate.connection.driver_class", "com.mysql.jdbc.Driver");
	    properties.put("hibernate.connection.password", "!qaz2wsx");
	    properties.put("hibernate.connection.url", "jdbc:mysql://localhost:3306/test");
	    properties.put("hibernate.connection.username", "root");

	    /*StandardServiceRegistryBuilder standardServiceRegistryBuilder = new StandardServiceRegistryBuilder();
	    standardServiceRegistryBuilder.applySettings(properties);

	    MetadataSources metadataSources = new MetadataSources(standardServiceRegistryBuilder.build());
	    metadataSources.addAnnotatedClass(Student.class);*/
	    
	    StandardServiceRegistry serviceRegistry= new StandardServiceRegistryBuilder().applySettings(properties).build();
	    
	    MetadataSources metadataSources = new MetadataSources(serviceRegistry);
	    metadataSources.addAnnotatedClass(Student.class).addAnnotatedClass(Transcripts.class);
	    
	    metadataSources.addAnnotatedClass(Person.class).addAnnotatedClass(Book.class);
	    
	    Metadata metadata = metadataSources.getMetadataBuilder().applyImplicitNamingStrategy(
	    		ImplicitNamingStrategyJpaCompliantImpl.INSTANCE).build();
	    
	    sessionFactory = metadata.getSessionFactoryBuilder().build();  
	    
	    return sessionFactory;
	}

	public static SessionFactory getSessionFactory() {
		return sessionFactory;
	}

	public static void shutdown() {
		// Close caches and connection pools
		getSessionFactory().close();
	}
}

测试

测试添加对象：

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/**
 * 添加个人和书籍
 */
public static void save() {
	SessionFactory sessionFactory = HibernateProUtil.getSessionFactory();

	Session session = sessionFactory.openSession();

	session.getTransaction().begin();

	Person person = new Person("XIAO LI", 22);

	Book book1 = new Book("A brief history of mankind", 65.11D, person);
	Book book2 = new Book("Math", 25.11D, person);

	person.getBooks().add(book1);
	person.getBooks().add(book2);

	session.save(person);

	session.getTransaction().commit();

	HibernateProUtil.shutdown();
}

测试结果：

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--Hibernate: 
    
    create table Book (
       B_ID bigint not null auto_increment,
        B_NAME varchar(255),
        B_PRICE double precision,
        P_ID bigint not null,
        primary key (B_ID)
    ) engine=InnoDB
--Hibernate: 
    
    create table Person (
       P_ID bigint not null auto_increment,
        AGE integer not null,
        NAME varchar(255),
        primary key (P_ID)
    ) engine=InnoDB
--Hibernate: 
    
    alter table Book 
       add constraint FKparw0y9103ja7oh11seeuw2wp 
       foreign key (P_ID) 
       references Person (P_ID)
--Hibernate: 
    insert 
    into
        Person
        (AGE, NAME) 
    values
        (?, ?)
--Hibernate: 
    insert 
    into
        Book
        (B_NAME, P_ID, B_PRICE) 
    values
        (?, ?, ?)
--Hibernate: 
    insert 
    into
        Book
        (B_NAME, P_ID, B_PRICE) 
    values
        (?, ?, ?)

更多操作

查询个人和书籍：

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/**
 * 查询个人和书籍
 */
public static void select() {
	SessionFactory sessionFactory = HibernateProUtil.getSessionFactory();

	Session session = sessionFactory.openSession();

	session.getTransaction().begin();

	Person person = session.get(Person.class, 1L);

	System.out.println(person);

	System.out.println("------------------");

	System.out.println(person.getBooks());

	session.getTransaction().commit();

	HibernateProUtil.shutdown();
}

更新个人和添加书籍:

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/**
 * 更新个人和添加书籍
 */
public static void update() {
	SessionFactory sessionFactory = HibernateProUtil.getSessionFactory();

	Session session = sessionFactory.openSession();

	session.getTransaction().begin();

	Person person = session.get(Person.class, 1L);

	Book book = new Book("English", 35.11D, person);

	person.getBooks().add(book);

	session.update(person);

	session.getTransaction().commit();

	HibernateProUtil.shutdown();
}

删除对象：

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/**
 * 删除个人和书籍
 */
public static void delete() {
	SessionFactory sessionFactory = HibernateProUtil.getSessionFactory();

	Session session = sessionFactory.openSession();

	session.getTransaction().begin();

	Person person = session.get(Person.class, 1L);

	session.delete(person);

	session.getTransaction().commit();

	HibernateProUtil.shutdown();
}

代码下载

java-hibernate-association-demo.zip