• (七)Hibernate 映射继承


    所有项目导入对应的hibernate的jar包、mysql的jar包和添加每次都需要用到的HibernateUtil.java

    第一节:每个具体类对应一个表

     Image.java

     1 package com.wishwzp.model;
     2 
     3 public abstract class Image {
     4 
     5     private int id;
     6     private String imageName;
     7     private Student student;
     8     
     9     public int getId() {
    10         return id;
    11     }
    12     public void setId(int id) {
    13         this.id = id;
    14     }
    15     public String getImageName() {
    16         return imageName;
    17     }
    18     public void setImageName(String imageName) {
    19         this.imageName = imageName;
    20     }
    21     public Student getStudent() {
    22         return student;
    23     }
    24     public void setStudent(Student student) {
    25         this.student = student;
    26     }
    27 }

    WorkImage.java

    1 package com.wishwzp.model;
    2 
    3 public class WorkImage extends Image{
    4 
    5 }

    LifeImage.java

    1 package com.wishwzp.model;
    2 
    3 public class LifeImage extends Image{
    4 
    5 }

    Student.java

     1 package com.wishwzp.model;
     2 
     3 import java.util.Set;
     4 
     5 public class Student {
     6 
     7     private int id;
     8     private String name;
     9     private Set<Image> images;
    10     
    11     public int getId() {
    12         return id;
    13     }
    14     public void setId(int id) {
    15         this.id = id;
    16     }
    17     public String getName() {
    18         return name;
    19     }
    20     public void setName(String name) {
    21         this.name = name;
    22     }
    23     public Set<Image> getImages() {
    24         return images;
    25     }
    26     public void setImages(Set<Image> images) {
    27         this.images = images;
    28     }
    29 }

     hibernate.cfg.xml

     1 <?xml version='1.0' encoding='utf-8'?>
     2 <!DOCTYPE hibernate-configuration PUBLIC
     3         "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
     4         "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
     5 
     6 <hibernate-configuration>
     7 
     8     <session-factory>
     9 
    10         <!--数据库连接设置 -->
    11         <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
    12         <property name="connection.url">jdbc:mysql://localhost:3306/hibernate</property>
    13         <property name="connection.username">root</property>
    14         <property name="connection.password">123456</property>
    15 
    16        
    17         <!-- 方言 -->
    18         <property name="dialect">org.hibernate.dialect.MySQL5Dialect</property>
    19     
    20         <!-- 控制台显示SQL -->
    21         <property name="show_sql">true</property>
    22 
    23         <!-- 自动更新表结构 -->
    24         <property name="hbm2ddl.auto">update</property>
    25         
    26           <mapping resource="com/wishwzp/model/Student.hbm.xml"/>
    27           <mapping resource="com/wishwzp/model/LifeImage.hbm.xml"/>
    28           <mapping resource="com/wishwzp/model/WorkImage.hbm.xml"/>
    29 
    30     </session-factory>
    31 
    32 </hibernate-configuration>

     StudentTest.java

     1 package com.wishwzp.service;
     2 
     3 import java.util.ArrayList;
     4 import java.util.Iterator;
     5 import java.util.List;
     6 import java.util.Set;
     7 
     8 import org.hibernate.Session;
     9 import org.hibernate.SessionFactory;
    10 import org.junit.After;
    11 import org.junit.Before;
    12 import org.junit.Test;
    13 
    14 import com.wishwzp.model.Image;
    15 import com.wishwzp.model.Image2;
    16 import com.wishwzp.model.Image3;
    17 import com.wishwzp.model.Student2;
    18 import com.wishwzp.model.Student3;
    19 import com.wishwzp.util.HibernateUtil;
    20 
    21 public class StudentTest {
    22 
    23     private SessionFactory sessionFactory=HibernateUtil.getSessionFactory();
    24     private Session session;
    25     
    26     @Before
    27     public void setUp() throws Exception {
    28         session=sessionFactory.openSession(); // 生成一个session
    29         session.beginTransaction(); // 开启事务
    30     }
    31 
    32     @After
    33     public void tearDown() throws Exception {
    34          session.getTransaction().commit(); // 提交事务
    35          session.close(); // 关闭session
    36     }
    37 
    38     @Test
    39     public void testGetAllImages(){
    40         
    41     }
    42 }

     WorkImage.java和LifeImage.java继承了 Image.java,我们在数据库里面可以看出来的。

     

    这里我们在向数据库里面插入一些数据。。。

     向t_student表中插入stuName为张三:

     向t_lifeimage表中插入imageName:

    向t_workimage表中插入imageName:

    然后我们查询这些数据:

    StudentTest.java

     1 package com.wishwzp.service;
     2 
     3 import java.util.ArrayList;
     4 import java.util.Iterator;
     5 import java.util.List;
     6 import java.util.Set;
     7 
     8 import org.hibernate.Session;
     9 import org.hibernate.SessionFactory;
    10 import org.junit.After;
    11 import org.junit.Before;
    12 import org.junit.Test;
    13 
    14 import com.wishwzp.model.Image;
    15 import com.wishwzp.model.Image2;
    16 import com.wishwzp.model.Image3;
    17 import com.wishwzp.model.Student2;
    18 import com.wishwzp.model.Student3;
    19 import com.wishwzp.util.HibernateUtil;
    20 
    21 public class StudentTest {
    22 
    23     private SessionFactory sessionFactory=HibernateUtil.getSessionFactory();
    24     private Session session;
    25     
    26     @Before
    27     public void setUp() throws Exception {
    28         session=sessionFactory.openSession(); // 生成一个session
    29         session.beginTransaction(); // 开启事务
    30     }
    31 
    32     @After
    33     public void tearDown() throws Exception {
    34          session.getTransaction().commit(); // 提交事务
    35          session.close(); // 关闭session
    36     }
    37 
    38     @Test
    39     public void testGetAllImages(){
    40         List<Image> imageList=new ArrayList<Image>();
    41         int stuId=1;
    42         List<Image> lifeImageList=(List<Image>)session.createQuery("from LifeImage l where l.student.id="+stuId).list();
    43         imageList.addAll(lifeImageList);
    44         List<Image> workImageList=(List<Image>)session.createQuery("from WorkImage w where w.student.id="+stuId).list();
    45         imageList.addAll(workImageList);
    46         Iterator it=imageList.iterator();
    47         while(it.hasNext()){
    48             Image image=(Image)it.next();
    49             System.out.println(image.getImageName());
    50         }
    51     }
    52 }

    控制台显示:

    第二节:根类对应一个表

     image2.java

     1 package com.wishwzp.model;
     2 
     3 public class Image2 {
     4 
     5     private int id;
     6     private String imageName;
     7     private String imageType;
     8     private Student2 student;
     9     
    10     public int getId() {
    11         return id;
    12     }
    13     public void setId(int id) {
    14         this.id = id;
    15     }
    16     public String getImageName() {
    17         return imageName;
    18     }
    19     public void setImageName(String imageName) {
    20         this.imageName = imageName;
    21     }
    22     public Student2 getStudent() {
    23         return student;
    24     }
    25     public void setStudent(Student2 student) {
    26         this.student = student;
    27     }
    28     public String getImageType() {
    29         return imageType;
    30     }
    31     public void setImageType(String imageType) {
    32         this.imageType = imageType;
    33     }
    34 }

    LifeImage2.java

    1 package com.wishwzp.model;
    2 
    3 public class LifeImage2 extends Image2{
    4 
    5 }

    WorkImage2.java

    1 package com.wishwzp.model;
    2 
    3 public class WorkImage2 extends Image2{
    4 
    5 }

    Student2.java

     1 package com.wishwzp.model;
     2 
     3 import java.util.Set;
     4 
     5 public class Student2 {
     6 
     7     private int id;
     8     private String name;
     9     private Set<Image2> images;
    10     
    11     public int getId() {
    12         return id;
    13     }
    14     public void setId(int id) {
    15         this.id = id;
    16     }
    17     public String getName() {
    18         return name;
    19     }
    20     public void setName(String name) {
    21         this.name = name;
    22     }
    23     public Set<Image2> getImages() {
    24         return images;
    25     }
    26     public void setImages(Set<Image2> images) {
    27         this.images = images;
    28     }
    29     
    30     
    31     
    32 }

    image2.hbm.xml

     1 <?xml version="1.0"?>
     2 <!DOCTYPE hibernate-mapping PUBLIC
     3         "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
     4         "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
     5 
     6 <hibernate-mapping package="com.wishwzp.model">
     7 
     8     <class name="Image2" table="t_image2">
     9         <id name="id" column="imageId">
    10             <generator class="native"></generator>
    11         </id>
    12         
    13         <discriminator column="imageType" type="string"></discriminator>
    14         <property name="imageName" column="imageName"></property>
    15         
    16         <many-to-one name="student" column="stuId" class="com.wishwzp.model.Student2"></many-to-one>
    17         
    18         <subclass name="com.wishwzp.model.LifeImage2" discriminator-value="li"></subclass>
    19         <subclass name="com.wishwzp.model.WorkImage2" discriminator-value="wi"></subclass>
    20     </class>
    21 
    22 </hibernate-mapping>

     Student2.hbm.xml

     1 <?xml version="1.0"?>
     2 <!DOCTYPE hibernate-mapping PUBLIC
     3         "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
     4         "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
     5 
     6 <hibernate-mapping package="com.wishwzp.model">
     7 
     8     <class name="Student2" table="t_student2">
     9         <id name="id" column="stuId">
    10             <generator class="native"></generator>
    11         </id>
    12         
    13         <property name="name" column="stuName"></property>
    14         
    15         <set name="images">
    16             <key column="stuId"></key>
    17             <one-to-many class="com.wishwzp.model.Image2"/>
    18         </set>
    19     </class>
    20 
    21 </hibernate-mapping>

    hibernate.cfg.xml

     1 <?xml version='1.0' encoding='utf-8'?>
     2 <!DOCTYPE hibernate-configuration PUBLIC
     3         "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
     4         "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
     5 
     6 <hibernate-configuration>
     7 
     8     <session-factory>
     9 
    10         <!--数据库连接设置 -->
    11         <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
    12         <property name="connection.url">jdbc:mysql://localhost:3306/hibernate</property>
    13         <property name="connection.username">root</property>
    14         <property name="connection.password">123456</property>
    15 
    16        
    17         <!-- 方言 -->
    18         <property name="dialect">org.hibernate.dialect.MySQL5Dialect</property>
    19     
    20         <!-- 控制台显示SQL -->
    21         <property name="show_sql">true</property>
    22 
    23         <!-- 自动更新表结构 -->
    24         <property name="hbm2ddl.auto">update</property>
    25 
    26           <mapping resource="com/wishwzp/model/Student2.hbm.xml"/>
    27           <mapping resource="com/wishwzp/model/Image2.hbm.xml"/>
    28           
    29 
    30     </session-factory>
    31 
    32 </hibernate-configuration>

     StudentTest.java

     1 package com.wishwzp.service;
     2 
     3 import java.util.ArrayList;
     4 import java.util.Iterator;
     5 import java.util.List;
     6 import java.util.Set;
     7 
     8 import org.hibernate.Session;
     9 import org.hibernate.SessionFactory;
    10 import org.junit.After;
    11 import org.junit.Before;
    12 import org.junit.Test;
    13 
    14 import com.wishwzp.model.Image;
    15 import com.wishwzp.model.Image2;
    16 import com.wishwzp.model.Image3;
    17 import com.wishwzp.model.Student2;
    18 import com.wishwzp.model.Student3;
    19 import com.wishwzp.util.HibernateUtil;
    20 
    21 public class StudentTest {
    22 
    23     private SessionFactory sessionFactory=HibernateUtil.getSessionFactory();
    24     private Session session;
    25     
    26     @Before
    27     public void setUp() throws Exception {
    28         session=sessionFactory.openSession(); // 生成一个session
    29         session.beginTransaction(); // 开启事务
    30     }
    31 
    32     @After
    33     public void tearDown() throws Exception {
    34          session.getTransaction().commit(); // 提交事务
    35          session.close(); // 关闭session
    36     }
    37 
    38     
    39     @Test
    40     public void testGetAllImages2(){
    41         
    42     }
    43 }

     

     插入数据:

     

     然后查询这些数据:

    StudentTest.java

     1 package com.wishwzp.service;
     2 
     3 import java.util.ArrayList;
     4 import java.util.Iterator;
     5 import java.util.List;
     6 import java.util.Set;
     7 
     8 import org.hibernate.Session;
     9 import org.hibernate.SessionFactory;
    10 import org.junit.After;
    11 import org.junit.Before;
    12 import org.junit.Test;
    13 
    14 import com.wishwzp.model.Image;
    15 import com.wishwzp.model.Image2;
    16 import com.wishwzp.model.Image3;
    17 import com.wishwzp.model.Student2;
    18 import com.wishwzp.model.Student3;
    19 import com.wishwzp.util.HibernateUtil;
    20 
    21 public class StudentTest {
    22 
    23     private SessionFactory sessionFactory=HibernateUtil.getSessionFactory();
    24     private Session session;
    25     
    26     @Before
    27     public void setUp() throws Exception {
    28         session=sessionFactory.openSession(); // 生成一个session
    29         session.beginTransaction(); // 开启事务
    30     }
    31 
    32     @After
    33     public void tearDown() throws Exception {
    34          session.getTransaction().commit(); // 提交事务
    35          session.close(); // 关闭session
    36     }
    37     
    38     @Test
    39     public void testGetAllImages2(){
    40         Student2 student2=(Student2)session.get(Student2.class, 1);
    41         Set<Image2> images=student2.getImages();
    42         Iterator it=images.iterator();
    43         while(it.hasNext()){
    44             Image2 image=(Image2)it.next();
    45             System.out.println(image.getImageName());
    46         }
    47     }
    48 }

    控制台显示:

     

    第三节:每个类对应一个表

     Student3.java

     1 package com.wishwzp.model;
     2 
     3 import java.util.Set;
     4 
     5 public class Student3 {
     6 
     7     private int id;
     8     private String name;
     9     private Set<Image3> images;
    10     
    11     public int getId() {
    12         return id;
    13     }
    14     public void setId(int id) {
    15         this.id = id;
    16     }
    17     public String getName() {
    18         return name;
    19     }
    20     public void setName(String name) {
    21         this.name = name;
    22     }
    23     public Set<Image3> getImages() {
    24         return images;
    25     }
    26     public void setImages(Set<Image3> images) {
    27         this.images = images;
    28     }
    29     
    30 }

    Image3.java

     1 package com.wishwzp.model;
     2 
     3 public class Image3 {
     4 
     5     private int id;
     6     private String imageName;
     7     private Student3 student;
     8     
     9     public int getId() {
    10         return id;
    11     }
    12     public void setId(int id) {
    13         this.id = id;
    14     }
    15     public String getImageName() {
    16         return imageName;
    17     }
    18     public void setImageName(String imageName) {
    19         this.imageName = imageName;
    20     }
    21     public Student3 getStudent() {
    22         return student;
    23     }
    24     public void setStudent(Student3 student) {
    25         this.student = student;
    26     }
    27     
    28 }

    LifeImage3.java

    1 package com.wishwzp.model;
    2 
    3 public class LifeImage3 extends Image3{
    4 
    5 }

    WorkImage3.java

    1 package com.wishwzp.model;
    2 
    3 public class WorkImage3 extends Image3{
    4 
    5 }

    Student3.hbm.xml

     1 <?xml version="1.0"?>
     2 <!DOCTYPE hibernate-mapping PUBLIC
     3         "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
     4         "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
     5 
     6 <hibernate-mapping package="com.wishwzp.model">
     7 
     8     <class name="Student3" table="t_student3">
     9         <id name="id" column="stuId">
    10             <generator class="native"></generator>
    11         </id>
    12         
    13         <property name="name" column="stuName"></property>
    14         
    15         <set name="images">
    16             <key column="stuId"></key>
    17             <one-to-many class="com.wishwzp.model.Image3"/>
    18         </set>
    19     </class>
    20 
    21 </hibernate-mapping>

    Image3.hbm.xml

     1 <?xml version="1.0"?>
     2 <!DOCTYPE hibernate-mapping PUBLIC
     3         "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
     4         "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
     5 
     6 <hibernate-mapping package="com.wishwzp.model">
     7 
     8     <class name="Image3" table="t_image3">
     9         <id name="id" column="imageId">
    10             <generator class="native"></generator>
    11         </id>
    12         
    13         <property name="imageName" column="imageName"></property>
    14         
    15         <many-to-one name="student" column="stuId" class="com.wishwzp.model.Student3"></many-to-one>
    16         
    17         <joined-subclass name="com.wishwzp.model.LifeImage3" table="t_lifeImage3">
    18             <key column="lifeImageId"></key>
    19         </joined-subclass>
    20         
    21         <joined-subclass name="com.wishwzp.model.WorkImage3" table="t_workImage3">
    22             <key column="workImageId"></key>
    23         </joined-subclass>
    24     </class>
    25 
    26 </hibernate-mapping>

    hibernate.cfg.xml

     1 <?xml version='1.0' encoding='utf-8'?>
     2 <!DOCTYPE hibernate-configuration PUBLIC
     3         "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
     4         "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
     5 
     6 <hibernate-configuration>
     7 
     8     <session-factory>
     9 
    10         <!--数据库连接设置 -->
    11         <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
    12         <property name="connection.url">jdbc:mysql://localhost:3306/hibernate</property>
    13         <property name="connection.username">root</property>
    14         <property name="connection.password">123456</property>
    15 
    16        
    17         <!-- 方言 -->
    18         <property name="dialect">org.hibernate.dialect.MySQL5Dialect</property>
    19     
    20         <!-- 控制台显示SQL -->
    21         <property name="show_sql">true</property>
    22 
    23         <!-- 自动更新表结构 -->
    24         <property name="hbm2ddl.auto">update</property>
    25               
    26           <mapping resource="com/wishwzp/model/Student3.hbm.xml"/>
    27           <mapping resource="com/wishwzp/model/Image3.hbm.xml"/>
    28 
    29     </session-factory>
    30 
    31 </hibernate-configuration>

    StudentTest.java

     1 package com.wishwzp.service;
     2 
     3 import java.util.ArrayList;
     4 import java.util.Iterator;
     5 import java.util.List;
     6 import java.util.Set;
     7 
     8 import org.hibernate.Session;
     9 import org.hibernate.SessionFactory;
    10 import org.junit.After;
    11 import org.junit.Before;
    12 import org.junit.Test;
    13 
    14 import com.wishwzp.model.Image;
    15 import com.wishwzp.model.Image2;
    16 import com.wishwzp.model.Image3;
    17 import com.wishwzp.model.Student2;
    18 import com.wishwzp.model.Student3;
    19 import com.wishwzp.util.HibernateUtil;
    20 
    21 public class StudentTest {
    22 
    23     private SessionFactory sessionFactory=HibernateUtil.getSessionFactory();
    24     private Session session;
    25     
    26     @Before
    27     public void setUp() throws Exception {
    28         session=sessionFactory.openSession(); // 生成一个session
    29         session.beginTransaction(); // 开启事务
    30     }
    31 
    32     @After
    33     public void tearDown() throws Exception {
    34          session.getTransaction().commit(); // 提交事务
    35          session.close(); // 关闭session
    36     }
    37     
    38     @Test
    39     public void testGetAllImages3(){
    40         
    41     }
    42 }

    插入一些数据:

     然后查询这些数据:

    StudentTest.java

     1 package com.wishwzp.service;
     2 
     3 import java.util.ArrayList;
     4 import java.util.Iterator;
     5 import java.util.List;
     6 import java.util.Set;
     7 
     8 import org.hibernate.Session;
     9 import org.hibernate.SessionFactory;
    10 import org.junit.After;
    11 import org.junit.Before;
    12 import org.junit.Test;
    13 
    14 import com.wishwzp.model.Image;
    15 import com.wishwzp.model.Image2;
    16 import com.wishwzp.model.Image3;
    17 import com.wishwzp.model.Student2;
    18 import com.wishwzp.model.Student3;
    19 import com.wishwzp.util.HibernateUtil;
    20 
    21 public class StudentTest {
    22 
    23     private SessionFactory sessionFactory=HibernateUtil.getSessionFactory();
    24     private Session session;
    25     
    26     @Before
    27     public void setUp() throws Exception {
    28         session=sessionFactory.openSession(); // 生成一个session
    29         session.beginTransaction(); // 开启事务
    30     }
    31 
    32     @After
    33     public void tearDown() throws Exception {
    34          session.getTransaction().commit(); // 提交事务
    35          session.close(); // 关闭session
    36     }
    37     
    38     @Test
    39     public void testGetAllImages3(){
    40         Student3 student3=(Student3)session.get(Student3.class, 1);
    41         Set<Image3> images=student3.getImages();
    42         Iterator it=images.iterator();
    43         while(it.hasNext()){
    44             Image3 image=(Image3)it.next();
    45             System.out.println(image.getImageName());
    46         }
    47     }
    48 }

    控制台显示:

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  • 原文地址:https://www.cnblogs.com/wishwzp/p/5486004.html
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