Hibernate4之集合类型映射(九)

hibernate集合类型映射

1.HibernateUtil类，是session工厂类

package com.newbeedaly.util;

import org.hibernate.SessionFactory;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;

public class HibernateUtil {

    private static final SessionFactory sessionFactory=buildSessionFactory();

    private static SessionFactory buildSessionFactory(){
        Configuration configuration=new Configuration().configure(); // 实例化配置文件
        ServiceRegistry serviceRegistry=new StandardServiceRegistryBuilder().applySettings(configuration.getProperties()).build(); // 实例化服务登记
        return configuration.buildSessionFactory(serviceRegistry); // 获取Session工厂
    }

    public static SessionFactory getSessionFactory(){
        return sessionFactory;
    }
}

2.hibernate.cfg.xml

<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
        "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">

<hibernate-configuration>

    <session-factory>

        <!--数据库连接设置 -->
        <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="connection.url">jdbc:mysql://localhost:3306/hibernate</property>
        <property name="connection.username">root</property>
        <property name="connection.password">123456</property>


        <!-- 方言 -->
        <property name="dialect">org.hibernate.dialect.MySQL5Dialect</property>

        <!-- 控制台显示SQL -->
        <property name="show_sql">true</property>

        <!-- 自动更新表结构 -->
        <property name="hbm2ddl.auto">update</property>

        <mapping resource="com/newbeedaly/model/Student.hbm.xml"/>
        <mapping resource="com/newbeedaly/model/Student2.hbm.xml"/>
        <mapping resource="com/newbeedaly/model/Student3.hbm.xml"/>
        <mapping resource="com/newbeedaly/model/Student4.hbm.xml"/>


    </session-factory>

</hibernate-configuration>

3 set集合

package com.newbeedaly.model;

import java.util.Set;

public class Student {

    private long id;
    private String name;
    private Set<String> images;

    public long getId() {
        return id;
    }
    public void setId(long id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public Set<String> getImages() {
        return images;
    }
    public void setImages(Set<String> images) {
        this.images = images;
    }




}

<?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.newbeedaly.model">

    <class name="Student" table="t_student">
        <id name="id" column="stuId">
            <generator class="native"></generator>
        </id>

        <property name="name" column="stuName"></property>

        <set name="images" table="t_image">
            <key column="studentId"></key>
            <element column="imageName" type="string"></element>
        </set>
    </class>

</hibernate-mapping>

4.list集合

package com.newbeedaly.model;

import java.util.List;

public class Student2 {

    private long id;
    private String name;
    private List<String> images;

    public long getId() {
        return id;
    }
    public void setId(long id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public List<String> getImages() {
        return images;
    }
    public void setImages(List<String> images) {
        this.images = images;
    }





}

<?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.newbeedaly.model">

    <class name="Student2" table="t_student">
        <id name="id" column="stuId">
            <generator class="native"></generator>
        </id>

        <property name="name" column="stuName"></property>

        <list name="images" table="t_image2">
            <key column="studentId"></key>
            <list-index column="imageIndex"></list-index>
            <element column="imageName" type="string"></element>
        </list>
    </class>

</hibernate-mapping>

3.bag集合

package com.newbeedaly.model;

import java.util.List;

public class Student3 {

    private long id;
    private String name;
    private List<String> images;

    public long getId() {
        return id;
    }
    public void setId(long id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public List<String> getImages() {
        return images;
    }
    public void setImages(List<String> images) {
        this.images = images;
    }





}

<?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.newbeedaly.model">

    <class name="Student3" table="t_student">
        <id name="id" column="stuId">
            <generator class="native"></generator>
        </id>

        <property name="name" column="stuName"></property>

        <idbag name="images" table="t_image3">
            <collection-id type="long" column="imageId">
                <generator class="increment"></generator>
            </collection-id>
            <key column="studentId"></key>
            <element column="imageName" type="string"></element>
        </idbag>


    </class>

</hibernate-mapping>

4.map键值对

<?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.newbeedaly.model">

    <class name="Student3" table="t_student">
        <id name="id" column="stuId">
            <generator class="native"></generator>
        </id>

        <property name="name" column="stuName"></property>

        <idbag name="images" table="t_image3">
            <collection-id type="long" column="imageId">
                <generator class="increment"></generator>
            </collection-id>
            <key column="studentId"></key>
            <element column="imageName" type="string"></element>
        </idbag>


    </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.newbeedaly.model">

    <class name="Student4" table="t_student">
        <id name="id" column="stuId">
            <generator class="native"></generator>
        </id>

        <property name="name" column="stuName"></property>

        <map name="images" table="t_image4">
            <key column="studentId"></key>
            <map-key column="imageKey" type="string"></map-key>
            <element column="imageName" type="string"></element>
        </map>


    </class>

</hibernate-mapping>

Test类

package com.newbeedaly.service;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import com.newbeedaly.model.Student;
import com.newbeedaly.model.Student2;
import com.newbeedaly.model.Student3;
import com.newbeedaly.model.Student4;
import com.newbeedaly.util.HibernateUtil;

public class StudentTest {

    private SessionFactory sessionFactory=HibernateUtil.getSessionFactory();
    private Session session;

    @Before
    public void setUp() throws Exception {
        session=sessionFactory.openSession(); // 生成一个session
        session.beginTransaction(); // 开启事务
    }

    @After
    public void tearDown() throws Exception {
         session.getTransaction().commit(); // 提交事务
         session.close(); // 关闭session
    }

    @Test
    public void testSetSave(){
        Set<String> imageSet=new HashSet<String>();
        imageSet.add("image1.png");
        imageSet.add("image2.png");
        imageSet.add("image3.png");
        imageSet.add("image3.png");

        Student s1=new Student();
        s1.setImages(imageSet);
        session.save(s1);
    }

    @Test
    public void testSetFetch(){
        Student student=(Student)session.get(Student.class, Long.valueOf(1));
        Iterator it=student.getImages().iterator();
        while(it.hasNext()){
            System.out.println(it.next());
        }
    }


    @Test
    public void testListSave(){
        List<String> imageList=new ArrayList<String>();
        imageList.add("image1.png");
        imageList.add("image2.png");
        imageList.add("image3.png");
        imageList.add("image3.png");

        Student2 s2=new Student2();
        s2.setImages(imageList);
        session.save(s2);
    }

    @Test
    public void testListFetch(){
        Student2 student2=(Student2)session.get(Student2.class, Long.valueOf(2));
        Iterator it=student2.getImages().iterator();
        while(it.hasNext()){
            System.out.println(it.next());
        }
    }

    @Test
    public void testBagSave(){
        List<String> imageList=new ArrayList<String>();
        imageList.add("image1.png");
        imageList.add("image2.png");
        imageList.add("image3.png");
        imageList.add("image3.png");

        Student3 s3=new Student3();
        s3.setImages(imageList);
        session.save(s3);
    }

    @Test
    public void testBagFetch(){
        Student3 student3=(Student3)session.get(Student3.class, Long.valueOf(3));
        Iterator it=student3.getImages().iterator();
        while(it.hasNext()){
            System.out.println(it.next());
        }
    }

    @Test
    public void testMapSave(){
        Map<String,String> imageMap=new HashMap<String,String>();
        imageMap.put("i1", "image1.png");
        imageMap.put("i2", "image2.png");
        imageMap.put("i3", "image3.png");
        imageMap.put("i4", "image4.png");

        Student4 s4=new Student4();
        s4.setImages(imageMap);
        session.save(s4);
    }

    @Test
    public void testMapFetch(){
        Student4 student4=(Student4)session.get(Student4.class, Long.valueOf(4));
        Map<String,String> imageMap=student4.getImages();
        Set keys=imageMap.keySet();
        Iterator it=keys.iterator();
        while(it.hasNext()){
            String key=(String)it.next();
            System.out.println(key+":"+imageMap.get(key));
        }
    }

}