实体xml文件映射多对多

Student实体
package com.yxfei.dojo;import java.io.Serializable;import java.util.List;public class Student implements Serializable {/** * */private static final long serialVersionUID = 5948895832050257601L;private Integer id;private String stuName;private String sex;private Integer age;private List<Grade> grade;public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}public String getStuName() {return stuName;}public void setStuName(String stuName) {this.stuName = stuName;}public String getSex() {return sex;}public void setSex(String sex) {this.sex = sex;}public Integer getAge() {return age;}public void setAge(Integer age) {this.age = age;}public List<Grade> getGrade() {return grade;}public void setGrade(List<Grade> grade) {this.grade = grade;}}

Student.hbm.xml文件

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd" ><hibernate-mapping><class name="com.yxfei.dojo.Student" table="student"><id column="id" name="id" type="java.lang.Integer"><generator class="native"></generator></id><property name="stuName" column="stu_name" length="20" type="java.lang.String"></property><property name="sex" column="stu_sex" length="4" type="java.lang.String"></property><property name="age" column="stu_age" type="java.lang.Integer"></property><bag name="grade" cascade="none"><key column="stu_id"></key><one-to-many class="com.yxfei.dojo.Grade"/></bag></class></hibernate-mapping>

Subject实体

package com.yxfei.dojo;import java.io.Serializable;import java.util.List;public class Subject implements Serializable {/** * */private static final long serialVersionUID = -3463020298559236707L;private Integer id;private String subName;private List<Grade> grade;public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}public String getSubName() {return subName;}public void setSubName(String subName) {this.subName = subName;}public List<Grade> getGrade() {return grade;}public void setGrade(List<Grade> grade) {this.grade = grade;}}

Subject.hbm.xml文件

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd" ><hibernate-mapping><class name="com.yxfei.dojo.Subject" table="subject"><id column="id" name="id" type="java.lang.Integer"><generator class="native"></generator></id><property name="subName" column="sub_name" length="20" type="java.lang.String"></property><bag name="grade" cascade="all-delete-orphan"><key column="sub_id"></key><one-to-many class="com.yxfei.dojo.Grade"/></bag></class></hibernate-mapping>

中间表Grade

package com.yxfei.dojo;import java.io.Serializable;public class Grade implements Serializable {/** * */private static final long serialVersionUID = -4479583430019536308L;private GradePK gpk;private Integer mark;public Integer getMark() {return mark;}public void setMark(Integer mark) {this.mark = mark;}public GradePK getGpk() {return gpk;}public void setGpk(GradePK gpk) {this.gpk = gpk;}}

Grade.hbm.xml

 <?xml version="1.0" encoding="UTF-8"?><!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd" ><hibernate-mapping><class name="com.yxfei.dojo.Grade" table="student_subject"><composite-id name="gpk" class="com.yxfei.dojo.GradePK"><key-many-to-one name="subject" column="sub_id" class="com.yxfei.dojo.Subject"></key-many-to-one><key-many-to-one name="student" column="stu_id" class="com.yxfei.dojo.Student"></key-many-to-one></composite-id><property name="mark" column="mark" type="java.lang.Integer"></property></class></hibernate-mapping>

主键类

package com.yxfei.dojo;import java.io.Serializable;public class GradePK implements Serializable {/** * */private static final long serialVersionUID = -5279921322268472152L;private Student student;private Subject subject;public GradePK(){}public GradePK(Student student, Subject subject) {this.student = student;this.subject = subject;}public Student getStudent() {return student;}public void setStudent(Student student) {this.student = student;}public Subject getSubject() {return subject;}public void setSubject(Subject subject) {this.subject = subject;}@Overridepublic boolean equals(Object obj) {// TODO Auto-generated method stubif (this == obj)return true;if (obj == null)return false;if (getClass() != obj.getClass())return false;final GradePK other = (GradePK) obj;if (student == null) {if (other.student != null)return false;} else if (!student.equals(other.student))return false;if (subject == null) {if (other.subject != null)return false;} else if (!subject.equals(other.subject))return false;return true;}@Overridepublic int hashCode() {// TODO Auto-generated method stubfinal int PRIME = 31;int result = 1;result = PRIME * result + ((student == null) ? 0 : student.hashCode());result = PRIME * result + ((subject == null) ? 0 : subject.hashCode());return result;}}