Hibernate 多对多关联关系配置与测试

Question

hibernate数据库java webxml

Answer 1

这样吧，你看看我给你的吧，希望你能懂public class Course { private int id ;
private String coursename ;
private Set<Student> Students = new HashSet<Student>();

public Set<Student> getStudents() {
return Students;
}
public void setStudents(Set<Student> students) {
Students = students;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getCoursename() {
return coursename;
}
public void setCoursename(String coursename) {
this.coursename = coursename;
}

}
Student的public class Student { private int id ;
private String name ;
private Set<Course> courses = new HashSet<Course>();

public Set<Course> getCourses() {
return courses;
}
public void setCourses(Set<Course> courses) {
this.courses = courses;
}
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;
}
}
Student.hbm.xml的<?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 package="com.hibernate.model">
<class name="Student">
<id name="id">
<generator class="native"></generator>
</id>
<property name="name"></property>
<set name="courses" table="student_course">
<key> 
<column name="StudentId"></column>
</key>
<many-to-many class="Course" column="courseId"></many-to-many>
</set>
</class>
</hibernate-mapping>
Course.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 package="com.hibernate.model">
<class name="Course">
<id name="id">
<generator class="native"></generator>
</id>
<property name="coursename"/>
<set name="students" table="student_course">
<key>
<column name="courseId"></column>
</key>
<many-to-many class="Student" column="StudentId"></many-to-many>
</set>

</class>

</hibernate-mapping>
最后你就可以加进去了啊 

Answer 2

对了，还有测试代码啊
Session session = sessionFactory.getCurrentSession() ;
session.beginTransaction() ;
Student s1 = new Student();
s1.setName("t1");
Course c1 = new Course();
c1.setCoursename("english");
s1.getCourses().add(c1) ;

session.save(s1);
session.save(c1) ;

session.getTransaction().commit();