自關(guān)聯(lián):本質(zhì)還是原來(lái)雙向一對(duì)多,原來(lái)要配置兩個(gè)類，現(xiàn)在全部都配置在一個(gè)類里面

Employee

public class Employee {private Long id;private String name;// 多對(duì)一： 多個(gè)員工對(duì)一上級(jí)private Employee manager;// 一對(duì)多：一個(gè)領(lǐng)導(dǎo)有多個(gè)下級(jí)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;// 多對(duì)一： 多個(gè)員工對(duì)一上級(jí) --><many-to-one name="manager" column="manager_id" class="Employee"/><!-- private Set<Employee> children = new HashSet<Employee>();// 一對(duì)多：一個(gè)領(lǐng)導(dǎo)有多個(gè)下級(jí) --><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();} }

源碼地址

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

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轉(zhuǎn)載于:https://www.cnblogs.com/je-ge/p/6105500.html

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