<?xml version="1.0" encoding="GBK"?> <project name="hibernate" basedir="." default=""> <property name="src" value="src"/> <property name="dest" value="classes"/> <path id="classpath"> <fileset dir="../../../lib"> <include name="**/*.jar"/> </fileset> <pathelement path="${dest}"/> </path> <target name="compile" description="Compile all source code"> <delete dir="${dest}"/> <mkdir dir="${dest}"/> <copy todir="${dest}"> <fileset dir="${src}"> <exclude name="**/*.java"/> </fileset> </copy> <javac destdir="${dest}" debug="true" includeantruntime="yes" deprecation="false" optimize="false" failonerror="true"> <src path="${src}"/> <classpath refid="classpath"/> <compilerarg value="-Xlint:deprecation"/> </javac> </target> <target name="run" description="Run the main class" depends="compile"> <java classname="lee.PersonManager" fork="yes" failonerror="true"> <classpath refid="classpath"/> </java> </target> </project>
<?xml version="1.0" encoding="GBK"?> <!-- 指定Hibernate配置文件的DTD信息 --> <!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd"> <!-- hibernate-configuration是配置文件的根元素 --> <hibernate-configuration> <session-factory> <!-- 指定连接数据库所用的驱动 --> <property name="connection.driver_class">com.mysql.jdbc.Driver</property> <!-- 指定连接数据库的url,其中hibernate是本应用连接的数据库名 --> <property name="connection.url">jdbc:mysql://localhost/hibernate</property> <!-- 指定连接数据库的用户名 --> <property name="connection.username">root</property> <!-- 指定连接数据库的密码 --> <property name="connection.password">32147</property> <!-- 指定连接池里最大连接数 --> <property name="hibernate.c3p0.max_size">20</property> <!-- 指定连接池里最小连接数 --> <property name="hibernate.c3p0.min_size">1</property> <!-- 指定连接池里连接的超时时长 --> <property name="hibernate.c3p0.timeout">5000</property> <!-- 指定连接池里最大缓存多少个Statement对象 --> <property name="hibernate.c3p0.max_statements">100</property> <property name="hibernate.c3p0.idle_test_period">3000</property> <property name="hibernate.c3p0.acquire_increment">2</property> <property name="hibernate.c3p0.validate">true</property> <!-- 指定数据库方言 --> <property name="dialect">org.hibernate.dialect.MySQL5InnoDBDialect</property> <!-- 根据需要自动创建数据库 --> <property name="hbm2ddl.auto">update</property> <!-- 显示Hibernate持久化操作所生成的SQL --> <property name="show_sql">true</property> <!-- 将SQL脚本进行格式化后再输出 --> <property name="hibernate.format_sql">true</property> <!-- 罗列所有持久化类的类名 --> <mapping class="org.crazyit.app.domain.Person"/> <mapping class="org.crazyit.app.domain.Address"/> </session-factory> </hibernate-configuration>
package org.crazyit.app.domain; import java.util.*; import javax.persistence.*; /** * Description: * <br/>网站: <a href="http://www.crazyit.org">疯狂Java联盟</a> * <br/>Copyright (C), 2001-2016, Yeeku.H.Lee * <br/>This program is protected by copyright laws. * <br/>Program Name: * <br/>Date: * @author Yeeku.H.Lee kongyeeku@163.com * @version 1.0 */ @Entity @Table(name="address_inf") public class Address { // 标识属性 @Id @Column(name="address_id") @GeneratedValue(strategy=GenerationType.IDENTITY) private int addressId; // 定义地址详细信息的成员变量 private String addressDetail; // 无参数的构造器 public Address() { } // 初始化全部成员变量的构造器 public Address(String addressDetail) { this.addressDetail = addressDetail; } // addressId的setter和getter方法 public void setAddressId(int addressId) { this.addressId = addressId; } public int getAddressId() { return this.addressId; } // addressDetail的setter和getter方法 public void setAddressDetail(String addressDetail) { this.addressDetail = addressDetail; } public String getAddressDetail() { return this.addressDetail; } }
package org.crazyit.app.domain; import java.util.*; import javax.persistence.*; /** * Description: * <br/>网站: <a href="http://www.crazyit.org">疯狂Java联盟</a> * <br/>Copyright (C), 2001-2016, Yeeku.H.Lee * <br/>This program is protected by copyright laws. * <br/>Program Name: * <br/>Date: * @author Yeeku.H.Lee kongyeeku@163.com * @version 1.0 */ @Entity @Table(name="person_inf") public class Person { // 标识属性 @Id @Column(name="person_id") @GeneratedValue(strategy=GenerationType.IDENTITY) private Integer id; private String name; private int age; // 定义该Person实体所有关联的Address实体 @OneToMany(targetEntity=Address.class) // 映射连接表为person_address @JoinTable(name="person_address", // 定义连接表中名为person_id的外键列,该外键列参照当前实体对应表的主键列 joinColumns=@JoinColumn(name="person_id" , referencedColumnName="person_id"), // 定义连接表中名为address_id的外键列, // 该外键列参照当前实体的关联实体对应表的主键列 inverseJoinColumns=@JoinColumn(name="address_id" , referencedColumnName="address_id", unique=true) ) private Set<Address> addresses = new HashSet<>(); // id的setter和getter方法 public void setId(Integer id) { this.id = id; } public Integer getId() { return this.id; } // name的setter和getter方法 public void setName(String name) { this.name = name; } public String getName() { return this.name; } // age的setter和getter方法 public void setAge(int age) { this.age = age; } public int getAge() { return this.age; } // addresses的setter和getter方法 public void setAddresses(Set<Address> addresses) { this.addresses = addresses; } public Set<Address> getAddresses() { return this.addresses; } }
package lee; import org.hibernate.*; import org.hibernate.cfg.*; import org.hibernate.service.*; import org.hibernate.boot.registry.*; /** * Description: * <br/>网站: <a href="http://www.crazyit.org">疯狂Java联盟</a> * <br/>Copyright (C), 2001-2016, Yeeku.H.Lee * <br/>This program is protected by copyright laws. * <br/>Program Name: * <br/>Date: * @author Yeeku.H.Lee kongyeeku@163.com * @version 1.0 */ public class HibernateUtil { public static final SessionFactory sessionFactory; static { try { // 使用默认的hibernate.cfg.xml配置文件创建Configuration实例 Configuration cfg = new Configuration() .configure(); // 以Configuration实例来创建SessionFactory实例 ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder() .applySettings(cfg.getProperties()).build(); sessionFactory = cfg.buildSessionFactory(serviceRegistry); } catch (Throwable ex) { System.err.println("Initial SessionFactory creation failed." + ex); throw new ExceptionInInitializerError(ex); } } // ThreadLocal可以隔离多个线程的数据共享,因此不再需要对线程同步 public static final ThreadLocal<Session> session = new ThreadLocal<Session>(); public static Session currentSession() throws HibernateException { Session s = session.get(); // 如果该线程还没有Session,则创建一个新的Session if (s == null) { s = sessionFactory.openSession(); // 将获得的Session变量存储在ThreadLocal变量session里 session.set(s); } return s; } public static void closeSession() throws HibernateException { Session s = session.get(); if (s != null) s.close(); session.set(null); } }
package lee; import org.hibernate.Transaction; import org.hibernate.Session; import java.util.Date; import java.util.Set; import java.util.HashSet; import org.crazyit.app.domain.*; /** * Description: * <br/>网站: <a href="http://www.crazyit.org">疯狂Java联盟</a> * <br/>Copyright (C), 2001-2016, Yeeku.H.Lee * <br/>This program is protected by copyright laws. * <br/>Program Name: * <br/>Date: * @author Yeeku.H.Lee kongyeeku@163.com * @version 1.0 */ public class PersonManager { public static void main(String[] args) { PersonManager mgr = new PersonManager(); mgr.testPerson(); HibernateUtil.sessionFactory.close(); } private void testPerson() { Session session = HibernateUtil.currentSession(); Transaction tx = session.beginTransaction(); // 创建一个瞬态的Person对象 Person p = new Person(); // 设置Person的name为crazyit.org字符串 p.setName("crazyit.org"); p.setAge(21); // 创建一个瞬态的Address对象 Address a = new Address("广州天河"); // 设置Person和Address之间的关联关系 p.getAddresses().add(a); // 创建一个瞬态的Address对象 Address a2 = new Address("上海虹口"); // 设置Person和Address之间的关联关系 p.getAddresses().add(a2); // 由于采用了连接表来维护1-N关联关系,因此不存在主从表关系, // 程序可以随意控制先持久化哪个实体。 // 持久化Address对象 session.persist(a2); // 持久化Person对象 session.save(p); // 持久化Address对象 session.persist(a); tx.commit(); HibernateUtil.closeSession(); } }