Hibernate關聯關係配置—–基於串連表的雙向多對多配置

實體：

package bi.many2many.jointable;import java.util.HashSet;import java.util.Set;public class Student {private int id;private String name;private Set<Teacher> teachers = new HashSet<Teacher>();public Student() {}public Student(int id, String name, Set<Teacher> teachers) {super();this.id = id;this.name = name;this.teachers = teachers;}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 Set<Teacher> getTeachers() {return teachers;}public void setTeachers(Set<Teacher> teachers) {this.teachers = teachers;}}package bi.many2many.jointable;import java.util.HashSet;import java.util.Set;public class Teacher {private int id;private String name;private Set<Student> students = new HashSet<Student>();public Teacher() {}public Teacher(int id, String name, Set<Student> students) {super();this.id = id;this.name = name;this.students = students;}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 Set<Student> getStudents() {return students;}public void setStudents(Set<Student> students) {this.students = students;}}

　　

hbm對應檔：

<hibernate-mapping><class name="bi.many2many.jointable.Student"><id name="id" column="sid"><generator class="native" /></id><property name="name" type="string" column="name"></property><set name="teachers" table="studentteacher"><key column="sid"></key><many-to-many class="bi.many2many.jointable.Teacher" column="tid"></many-to-many></set></class></hibernate-mapping><hibernate-mapping><class name="bi.many2many.jointable.Teacher"><id name="id" column="tid"><generator class="native" /></id><property name="name" type="string" column="name"></property><set name="students" table="studentteacher" inverse="true"><key column="tid"></key><many-to-many class="bi.many2many.jointable.Student" column="sid"></many-to-many></set></class></hibernate-mapping>

　　

測試檔案：

public class Test {@org.junit.Testpublic void testAdd() {SessionFactory sf = HibernateUtil.getSessionFactory();Session session = sf.getCurrentSession();session.beginTransaction();Teacher t1 = new Teacher();t1.setName("李剛");Teacher t2 = new Teacher();t2.setName("張孝祥");Teacher t3 = new Teacher();t3.setName("馬士兵");Student s1 = new Student();s1.setName("張三");s1.getTeachers().add(t1);s1.getTeachers().add(t2);s1.getTeachers().add(t3);Student s2 = new Student();s2.setName("李四");s2.getTeachers().add(t3);s2.getTeachers().add(t2);session.save(t1);session.save(t2);session.save(t3);session.save(s1);session.save(s2);session.beginTransaction().commit();}}

　　

測試結果：

Hibernate: insert into Teacher (name) values (?)Hibernate: insert into Teacher (name) values (?)Hibernate: insert into Teacher (name) values (?)Hibernate: insert into Student (name) values (?)Hibernate: insert into Student (name) values (?)Hibernate: insert into studentteacher (sid, tid) values (?, ?)Hibernate: insert into studentteacher (sid, tid) values (?, ?)Hibernate: insert into studentteacher (sid, tid) values (?, ?)Hibernate: insert into studentteacher (sid, tid) values (?, ?)Hibernate: insert into studentteacher (sid, tid) values (?, ?)