自关联:本质还是原来双向一对多,原来要配置两个类，现在全部都配置在一个类里面

Employee

public class Employee {private Long id;private String name;// 多对一： 多个员工对一上级private Employee manager;// 一对多：一个领导有多个下级private Set<Employee> children = new HashSet<Employee>();

Employee.hbm.xml

<class name="Employee" table="t_employee"><id name="id"><generator class="native" /></id><property name="name" /><!-- private Employee manager;// 多对一： 多个员工对一上级 --><many-to-one name="manager" column="manager_id" class="Employee"/><!-- private Set<Employee> children = new HashSet<Employee>();// 一对多：一个领导有多个下级 --><set name="children" inverse="true" cascade="save-update"><key column="manager_id" /><one-to-many class="Employee" /></set></class>

MainTest

public class MainTest {Session session = null;@Beforepublic void save() {session = HibernateUtils.INSTANCE.getSession();session.beginTransaction();Employee boss = new Employee("boss");Employee manager = new Employee("manager");Employee emp1 = new Employee("emp1");Employee emp2 = new Employee("emp2");manager.addEmployee(emp1).addEmployee(emp2);boss.addEmployee(manager);session.save(boss);}@Testpublic void get() {Employee boss = (Employee) session.get(Employee.class, 1L);System.out.println("boss:" + boss.getName());Set<Employee> employees = boss.getChildren();for (Employee manager : employees) {System.out.println("manager:" + manager.getName());Set<Employee> children = manager.getChildren();for (Employee employee : children) {System.out.println("employee:" + employee.getName());}}}@Afterpublic void colse() {session.getTransaction().commit();session.close();}
}

源码地址

https://github.com/je-ge/hibernate

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