Enterprise Java Development@TOPIC@

Part X. Java Persistence API: Relations

Mapping Entity Relations to the Database

Copyright © 2019 jim stafford (jim.stafford@jhu.edu)

2019-08-22 07:10 EST

Abstract

This presentation provides information for mapping Java entity class relationships to the database using JPA.

Table of Contents

Purpose
1. Goals
2. Objectives
56. One-to-One Relationships
56.1. One-to-One: Uni-directional
56.2. @OneToOne Annotation
56.3. @JoinColumn Annotation
56.4. @JoinColumns Annotation
56.5. One-to-One: Bi-directional
56.6. Bi-directional Relationships and Ownership
56.7. Other Topics
56.8. Summary
57. One-to-Many Relationships
57.1. One-to-Many: Uni-directional
57.2. @OneToMany Annotation
57.3. One-to-Many: Bi-directional
57.4. @ManyToOne Annotation
57.5. One-to-Many: Element Collection
57.6. @ElementCollection Annotation
57.7. Other Topics
57.8. Summary
58. Relationship Capabilities
58.1. Fetching
58.1.1. fetch=LAZY
58.1.2. fetch=EAGER
58.2. Cascades
58.3. Orphan Removal
58.4. Summary
59. Object Collections
59.1. Object Identity
59.1.1. Instance Id
59.1.2. Primary Key Id
59.1.3. Switching Ids
59.1.4. Business Id
59.2. Collection Types
59.3. Summary
60. Foreign Keys
60.1. Primary Key Join
60.1.1. @PrimaryKeyJoin Annotation
60.2. Using Composite Primary Key Property as Foreign Key
60.2.1. Using @IdClass Composite Primary Key Property as Foreign Key
60.2.2. Using @EmbeddedId Composite Primary Key Property as Foreign Key
60.3. Using Foreign Key in Composite Primary Key
60.3.1. Using Foreign Key in @IdClass Composite Primary Key
60.3.2. Using Foreign Key in @EmbeddedId Composite Primary Key (@MapsId)
60.4. Join Tables
60.4.1. @JoinTable Annotation
60.5. Summary
61. Many-to-One Relationships
61.1. Many-to-One: Uni-directional
61.2. Summary
62. Many-to-Many Relationships
62.1. Many-to-Many: Uni-directional
62.2. Many-to-Many: Bi-directional
62.3. Summary