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摘要: Eclipse快速上手Hibernate--8. 关联映射(多对多)
Student.java
package javamxj.hibernate.association.many2many; import java.util.HashSet; import java.util.Set; /** * @hibernate.class table = "T_Student" */ public class Student { private Long id; private Set courses=new HashSet(); private String name; public Student() {} public Student(String name) { this.name = name; } /** * @hibernate.id *column="ID" *generator-class="hilo" *unsaved-value="null" */ public Long getId() {return id;} public void setId(Long id) {this.id = id;} /** * @hibernate.set * table="students_in_course" * cascade="save-update" * @hibernate.collection-many-to-many * column="fk_course" * class="javamxj.hibernate.association.many2many.Course" * @hibernate.collection-key * column="fk_student" */ public Set getCourses() {return courses;} public void setCourses(Set courses) {this.courses = courses;} /** * @hibernate.property length = "16" */ public String getName() {return name;} public void setName(String name) {this.name = name;} }
Course.java
package javamxj.hibernate.association.many2many; /** * @hibernate.class table = "T_Course" */ public class Course { private Long id; private String description; public Course(){} public Course(String description) { this.description = description; } /** * @hibernate.id *column="ID" *generator-class="hilo" *unsaved-value="null" */ public Long getId() {return id;} public void setId(Long id) {this.id = id;} /** * @hibernate.property * length = "40" */ public String getDescription() {return description;} public void setDescription(String description) {this.description = description;} }
Demo.java
/* * Hibernate - 关联(Association)映射(多对多) * 创建日期 2005-5-1 * @author javamxj(分享java快乐) * @link Blog: htpp://blog.csdn.net/javamxj/ * htpp://javamxj.mblogger.cn */ package javamxj.hibernate.association.many2many; import net.sf.hibernate.HibernateException; import net.sf.hibernate.Session; import net.sf.hibernate.SessionFactory; import net.sf.hibernate.Transaction; import net.sf.hibernate.cfg.Configuration; public class Demo { public static void main(String[] args) throws HibernateException { Student s1 = new Student("张三"); Student s2 = new Student("李四"); Course c1 = new Course("计算机"); Course c2 = new Course("英语"); Course c3 = new Course("航模活动"); Course c4 = new Course("数学"); s1.getCourses().add(c1); s1.getCourses().add(c2); s2.getCourses().add(c2); s2.getCourses().add(c3); s2.getCourses().add(c4); SessionFactory sf= new Configuration().configure().buildSessionFactory(); Session session = sf.openSession(); Transaction tx = session.beginTransaction(); session.save(s1); session.save(s2); tx.commit(); session.close(); sf.close(); } }