· 双向关联(Bidirectional) 如上述示例中,将AddressEO修改如下: ·地址薄类AddressEO: @Entity @Table(name="address") public class AddressEO implement Serializable{ @Id @GeneratedValue(stragegy=GenerationType=AUTO) private int id; @OneToOne(mappedBy="address") privatre CustomerEO customer; ... } ...
您有多个选项，但所有这些都取决于在拥有方正确设置关系，在您的例子中，这是Dependant。您的最佳选择...
# @JoinColumn可以与@OneToOne、@ManyToOne或@ManyToMany标记同时使用。 一对一单向关联示例: ·客户实体类CustomerEO: @OneToOne(casade={CascadeTypeType.ALL})@JoinColumn(name="address_id")//关联的表为address表,其主键是id ·地址薄类AddressEO: @Table(name="address")//从表 ·双向关联(Bidirectional) ...
4 Example 4 : JPA OneToOne Primary Key Join Column Mapping 5 Example 5 : JPA OneToOne Map Cascade Mapping 6 Example 6 : JPA OneToOne Unidirectional Mapping 7 Example 7 : JPA OneToOne Bidirectional Mapping Chapter 2 : JPA One to Many Mapping ...
@OneToOne 表示实体类与嵌入式类之间一对一的映射关系。这个注解用在一个实体类包含一个嵌入式的类。比如在在例子1里,这个注解放在User类的Heart属性上。当SDJ生成表的时候,会在User表上生成一个字段名为heart_id的外键。该注解有个级联cascade的属性,可选(ALL,PERSIST,MERGE,REMOVE,REFRESH,DETACH),拿PERSIST说...
In bidirectional one-to-many/many-to-one relationship, the target side has a reference back to the source entity as well. The annotation @OneToMany is used on the side which has the collection reference. The annotation @ManyToOne is used on the side which has the single-valued back reference...
It is not normally necessary to specify the associated target entity explicitly since it can usually be inferred from the type of the object being referenced. If the relationship is bidirectional, the non-owning side must use the mappedBy element of the OneToOne annotation to specify the ...
With this example we are going to demonstrate how to use One to Many bidirectional mapping in JPA. The Java Persistence API provides Java developers with
23.@OneToOne and Cascadeforum.hibernate.org Hello. I need help with @OneToOne relationship. Now I using bidirectional OneToOne association to handle correct object deletion (CascadeType.REMOVE), but it is impossible Lazy loading on "mappedBy" side. I do not need bidirectional association, I ...
@LazyToOne: 定义了@ManyToOne 和 @OneToOne 关联的延迟选项. LazyToOneOption 可以是PROXY (例如:基于代理的延迟加载),NO_PROXY (例如:基于字节码增强的延迟加载 - 注意需要在构建期处理字节码)和 FALSE (非延迟加载的关联) @LazyCollection: 定义了@ManyToMany和@OneToMany 关联的延迟选项. LazyCollectionOption...