Hibernate 继承 - 每个类都映射成一个类

- Image.java

package com.java1234.hibernate.model;public class Image {private int id;private String name;//建立student对象，用于映射student信息。private Student student;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;}public Student getStudent() {return student;}public void setStudent(Student student) {this.student = student;}@Overridepublic String toString() {return "Image [id=" + id + ", name=" + name + ", student=" + student + "]";}}

- LifeImages.java

package com.java1234.hibernate.model;public class LifeImages extends Image{private int id;private String name;//建立student对象，用于映射student信息。private Student student;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;}public Student getStudent() {return student;}public void setStudent(Student student) {this.student = student;}
}

- WorkImages.java

package com.java1234.hibernate.model;public class WorkImages extends Image{private int id;private String name;//建立student对象，用于映射student信息。private Student student;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;}public Student getStudent() {return student;}public void setStudent(Student student) {this.student = student;}
}

- Student.java

package com.java1234.hibernate.model;import java.util.Set;public class Student {private int id;private String name;private Set<Image> images;public Set<Image> getImages() {return images;}public void setImages(Set<Image> images) {this.images = images;}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;}@Overridepublic String toString() {return "Student [id=" + id + ", name=" + name + "]";}}

- image.hbm.xml

<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN""http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd"><hibernate-mapping><class name="com.java1234.hibernate.model.Image" table="tb_image"><id name="id" column="imgId"><generator class="native"/></id><property name="name" column="imgName"/><many-to-one name="student" class="com.java1234.hibernate.model.Student" column="stuId" cascade="save-update"/><joined-subclass name="com.java1234.hibernate.model.LifeImages" table="tb_lifeImage"><key column="lifeImageId"/></joined-subclass><joined-subclass name="com.java1234.hibernate.model.WorkImages" table="tb_workImage"><key column="workImageId"/></joined-subclass></class></hibernate-mapping>

- student.hbm.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN""http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd"><hibernate-mapping><class name="com.java1234.hibernate.model.Student" table="tb_student" lazy="false"><id name="id" column="stuId"><generator class="native"/></id><property name="name" column="stuName"/><!-- 由于Image.java是一个非抽象的类，所以可以通过Image类来实例化对象。在这里 通过配置set，用于配置双向的一对多映射 --><set name="images" table="tb_image" cascade="save-update"><key column="stuId"/><!-- 通过image表里的stuId完成连接 --><one-to-many class="com.java1234.hibernate.model.Image"/></set></class></hibernate-mapping>

生成的数据库表结构/执行过程中的SQL

Hibernate: create table tb_image (imgId integer not null auto_increment, imgName varchar(255), stuId integer, primary key (imgId))
Hibernate: create table tb_lifeImage (lifeImageId integer not null, primary key (lifeImageId))
Hibernate: create table tb_student (stuId integer not null auto_increment, stuName varchar(255), primary key (stuId))
Hibernate: create table tb_workImage (workImageId integer not null, primary key (workImageId))
Hibernate: alter table tb_image add constraint FK_8f53143v9q9i7j3mgk7b090pk foreign key (stuId) references tb_student (stuId)
Hibernate: alter table tb_lifeImage add constraint FK_6ieihsxe00srdc2nqhc9i2lpw foreign key (lifeImageId) references tb_image (imgId)
Hibernate: alter table tb_workImage add constraint FK_fpcoksmnfjchh5rth9a5sk47x foreign key (workImageId) references tb_image (imgId)