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.xm…

双向多对多inverse配置 如果关系两边都使用默认inverse=false配置,表示关系两边都可以管理中间表的数据 关系其中一边设置inverse=true配置,表示自己放弃管理中间表关系,由对方来管理 如果关系两边都使用默认inverse=true配置,表示关系两边都不管理中间表,是不能这样配置的 hibernate.cfg.xml <mapping resource="com/jege/hibernate/two/way/manytomany/User.hbm.xml"…

主要讲解inverse和cascade的用法 cascade定义的是关系两端对象到对象的级联关系: 而inverse定义的是关系和对象的级联关系(管理外键的值). inverse 属性默认是false的,就是说关系的两端都来维护关系. 在双向多对一里面配置到一方的集合属性上面,inverse=true,表示关系的维护(外键的值)由对方(多方)来管理 cascade all : 所有情况下均进行关联操作. none:所有情况下均不进行关联操作.这是默认值. save-update:在执行save/…

在二级缓存配置成功的基础上进行查询缓存配置 Product public class Product { private Long id; private String name; Product.hbm.xml <class name="Product"> <id name="id"> <generator class="native" /> </id> <property name=&qu…

pom.xml <dependency> <groupId>org.hibernate</groupId> <artifactId>hibernate-ehcache</artifactId> <version>${hibernate.version}</version> </dependency> Product /** * @author JE哥 * @email 1272434821@qq.com * @…

Product public class Product { private Long id; private String name; Product.hbm.xml <class name="Product"> <id name="id"> <generator class="native" /> </id> <property name="name" /> &l…

Employee public class Employee { private Long id; private String name; HourlyEmployee public class HourlyEmployee extends Employee { private Double rate; SalariedEmployee public class SalariedEmployee extends Employee { private Double salary; Employe…

Employee public class Employee { private Long id; private String name; HourlyEmployee public class HourlyEmployee extends Employee { private Double rate; SalariedEmployee public class SalariedEmployee extends Employee { private Double salary; Employe…

Employee public class Employee { private Long id; private String name; HourlyEmployee public class HourlyEmployee extends Employee { private Double rate; SalariedEmployee public class SalariedEmployee extends Employee { private Double salary; Employe…

Single Table策略 通过 discriminator鉴别器来区分是父类还是子类 Employee public class Employee { private Long id; private String name; HourlyEmployee public class HourlyEmployee extends Employee { private Double rate; SalariedEmployee public class SalariedEmployee exte…