2015年10月24日
Hibernate Many-to-Many Unidirectional mapping
摘要： In many to many, it creates three tables in total.Student,Teacher,Student_teacherIn our example, all mappings are done in teacher class1.AnnotationTea... 阅读全文
posted @ 2015-10-24 09:07 fifi努刷题 阅读(161) 评论(0) 推荐(0)
Hibernate One-To-Many&Many-To-One Mapping
摘要： 1.AnnotationGroup Class: we usually put @JoinColumn(name="xx") right below @OneToMany.However, since we will have @ManyToOne in user class, it auto ge... 阅读全文
posted @ 2015-10-24 08:48 fifi努刷题 阅读(632) 评论(0) 推荐(0)
Hibernate One-To-Many Unidirectional Mapping
摘要： Group- User: one to manyIn group class, we have a Set users to store user;1.Annotation@Entity@Table(name="x_Group")public class Group { private int... 阅读全文
posted @ 2015-10-24 07:35 fifi努刷题 阅读(151) 评论(0) 推荐(0)
Hibernate Many-To-One Unidirectional Mapping
摘要： Foreign key is always added on the "many" side;User-Group:Many-to-one1.AnnotationUser class: Just need to add @ManyToOne tag before group variableGrou... 阅读全文
posted @ 2015-10-24 07:19 fifi努刷题 阅读(151) 评论(0) 推荐(0)
Hibernate Component keys
摘要： Wife is a component of Husband class and thus they are stored in one table in DB.1.AnnotationHusband: put @Embedded before component Wife.Only need on... 阅读全文
posted @ 2015-10-24 06:46 fifi努刷题 阅读(182) 评论(0) 推荐(0)
Hibernate one-to-one mapping with Composite key
摘要： 1.AnnotationHusband class: @JoinColumns ({@JoinColumn(name="",referencedColumnName="") ,@JoinColumn(name="",referencedColumnName="")})@Entitypublic cl... 阅读全文
posted @ 2015-10-24 06:36 fifi努刷题 阅读(164) 评论(0) 推荐(0)
Hibernate one-to-one mapping
摘要： Uni-direction: only one class has a referenceBidirection: both classes have the reference1.AnnotationUni-direction: no change to wife; wife_id is used... 阅读全文
posted @ 2015-10-24 06:02 fifi努刷题 阅读(224) 评论(0) 推荐(0)
2015年10月21日
Java 基础知识-Private
摘要： 1. Private variable & Private Method常理 private 只对本类可见. 但是Java 可以通过reflection 调用.Private Variable id:Teacher t=new Teacher();Field f=t.getClass().getDe... 阅读全文
posted @ 2015-10-21 07:28 fifi努刷题 阅读(205) 评论(0) 推荐(0)