@Entity
@Inheritance(strategy = InheritanceType.JOINED)
@Table(name = "tbp_user")
public class User extends EnterpriseObject {有个一个user实体类作为父类,student作为子类,@Entity
@Table(name = "tbp_student")
public class Student extends User {
现在在更新的时候我想将user对象转换成student对象,如果直接调用merge方法肯定报notfound的异常,因为没有这个student对象,如果先删除user再新增student也会报错,这两种方法是我目前多能想的了,都搞不定,,请问怎么才能在hibernate中将父类转换为子类hibernate父类子类jpaejb
User u=new Student();