JPA /休眠：註釋對於已經創建的表

Question

我有兩個表（已創建的），說的人，並與下面的模式地址：

create table Person (
    `id` int(11) not null auto_increment, 
    `name` varchar(255) default null, 
    primary key(`id`) 
) 

create table Address (
    `id` int(11) not null, 
    `city` varchar(255) default null, 
    primary key (`id`), 
    constraint foreign key (`id`) references `Person`(`id`) 
) 

現在，我應該在代碼中使用的註解？

兩個類的骨架是：

class Person { 
    @Id @GeneratedValue 
    @Column(name="id") 
    int id; 
    String name; 

    Address address; 
} 

class Address { 
    int id; 
} 

我需要在添加註釋爲地址場人類和ID的地址類場。

Answer 1

我想你想使用@MapsId。

@Entity 
class Person { 
    @Id 
    @GeneratedValue 
    int id; 

    String name; 

    @OneToOne 
    @MapsId 
    Address address; 
} 

@Entity 
class Address { 
    @Id 
    int id; 
} 

查看@OneToOne文檔中的示例2。

Answer 2

class Person { 
    @Id @GeneratedValue 
    @Column(name="id") 
    int id; 
    String name; 

    @OneToOne 
    @JoinColumn(name = "address_id", referencedColumnName = "id") 
    Address address; 
} 

class Address { 
    @id 
    int id; 
} 

Answer 3

在Person.java

@OneToOne(cascade = CascadeType.ALL, fetch = FetchType.LAZY) 
@JoinColumn(name = "id",nullable=false) 
@ForeignKey(name = "fk_id")  
private Address address; 

和地址的.java -

@OneToOne(fetch=FetchType.LAZY) 
@JoinColumn(name = "id", updatable = false, insertable = false, nullable=false) 
private Person id;  

@Column(name = "id", insertable = false, updatable = false, nullable=false) 
private Integer id;