hibernate入门

package com.hello;public class Account { ???????private int id; ???private String 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; ???}}

package com.hello;import java.util.HashSet;import java.util.Set;public class User { ???private int id; ???private String name; ???private String desc1; ???private byte[] photo; ???????private Set<Account> accounts=new HashSet<Account>(); ???????private Set<String> addresses=new HashSet<String>(); ???????????public Set<String> getAddresses() { ???????return addresses; ???} ???public void setAddresses(Set<String> addresses) { ???????this.addresses = addresses; ???} ???public Set<Account> getAccounts() { ???????return accounts; ???} ???public void setAccounts(Set<Account> accounts) { ???????this.accounts = accounts; ???} ???public byte[] getPhoto() { ???????return photo; ???} ???public void setPhoto(byte[] photo) { ???????this.photo = photo; ???} ???public String getDesc1() { ???????return desc1; ???} ???public void setDesc1(String desc) { ???????this.desc1 = desc; ???} ???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; ???}}

<?xml version="1.0"?><!DOCTYPE hibernate-mapping PUBLIC ???????"-//Hibernate/Hibernate Mapping DTD 3.0//EN" ???????"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd"><hibernate-mapping package="com.hello"> ???<!-- ????????name属性：哪个类 ???????table属性：对应哪个表，如果不写，默认的表名就是类的简单名称 ???--> ???<class name="Account" table="t_account"> ???????<id name="id"> ???????????<generator class="native"/> ???????</id> ???????<property name="name" ?not-null="true"/> ????</class></hibernate-mapping>

<?xml version="1.0"?><!DOCTYPE hibernate-mapping PUBLIC ???????"-//Hibernate/Hibernate Mapping DTD 3.0//EN" ???????"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd"><hibernate-mapping package="com.hello"> ???<!-- name属性：哪个类 table属性：对应哪个表，如果不写，默认的表名就是类的简单名称 --> ???<class name="User" table="t_user"> ???????<id name="id"> ???????????<generator class="native" /> ???????</id> ???????<property name="name" not-null="true" /> ???????<property name="desc1" column="desc1" /> ???????<property name="photo" column="photo" length="102400" /> ???????<set name="accounts" inverse="true"> ???????????<key column="uid"></key> ???????????<one-to-many class="com.hello.Account" /> ???????</set> ???????<!-- sort="natural" --> ???????<set name="addresses" table="user_address" ?order-by="address DESC"> ???????????<key column="uid"></key> ???????????<element type="string" column="address"></element> ???????</set> ???</class></hibernate-mapping>

package com.test;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.InputStream;import java.util.EnumSet;import org.hibernate.Session;import org.hibernate.SessionFactory;import org.hibernate.Transaction;import org.hibernate.boot.Metadata;import org.hibernate.boot.MetadataSources;import org.hibernate.boot.registry.StandardServiceRegistry;import org.hibernate.boot.registry.StandardServiceRegistryBuilder;import org.hibernate.cfg.Configuration;import org.hibernate.service.ServiceRegistry;import org.hibernate.tool.hbm2ddl.SchemaExport;import org.junit.Test;import com.hello.Account;import com.hello.User;public class HelloTest { ???private static SessionFactory sessionFactory; ???static { ???????sessionFactory = new Configuration() ???????.configure() // 读取配置文件 ???????.buildSessionFactory(); ???} ???// 根据配置生成表结构 ???@Test ???public void test() { ???????//hibernate 3.0版本的 ???????/* ?Configuration cfg = new Configuration().configure(); ???????SchemaExport schemaExport = new SchemaExport(cfg); ???????// 第一个参数script的作用： print the DDL to the console ???????// 第二个参数export的作用： export the script to the database ???????schemaExport.create(true, true);*/ ???????//hibernate 5.0 ???????Configuration conf = new Configuration().configure();//1、读取配置文件 ???????StandardServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder().configure().build(); ???????Metadata metadata = new MetadataSources(serviceRegistry).buildMetadata(); ???} ???@Test ???public void hello(){ ???????byte[] photo = null ; ???????try { ???????????InputStream in=new FileInputStream("C://Users//Administrator//Desktop//1.jpg"); ???????????photo = new byte[in.available()]; ???????????in.read(photo); ???????????in.close(); ???????} catch (Exception e) { ???????????// TODO Auto-generated catch block ???????????e.printStackTrace(); ???????????System.out.println("图片导入流失败！"); ???????} ???????Session session=sessionFactory.openSession(); ???????Transaction tx = session.beginTransaction(); ???????User user=new User(); ???????user.setId(1); ???????user.setName("a"); ???????user.setPhoto(photo); ???????Account account=new Account(); ???????account.setId(1); ???????account.setName("1"); ???user.getAccounts().add(account); ???????// ???user.getAddresses().add("天安门"); ???????// ???user.getAddresses().add("故宫"); ???????session.save(account); ???????session.save(user); ???????????????tx.commit(); ???????????????Session session2=sessionFactory.openSession(); ???????Transaction tx2= session2.beginTransaction(); ???????User user2 = session.get(User.class, 3); ???????System.out.println(user2.getAccounts()); ???????tx2.commit(); ???} ???@Test ???public void testGet(){ ???????Session session=sessionFactory.openSession(); ???????Transaction tx = session.beginTransaction(); ???????User user = session.get(User.class, 1); ???????System.out.println(user.getName()); ???????System.out.println(user.getAddresses()); ???}}