public @interface OneToOne { Class targetEntity() default void.class; CascadeType[] cascade() default {}; FetchType fetch() default EAGER; boolean optional() default true; String mappedBy() default ""; } # targetEntity属性表示默认关联的实体类型,默认为当前标注的实体类; # cascade属性表示与此实...
private Timestamp birthday;//出生日期 @OneToOne(cascade=CascadeType.ALL)//People是关系的维护端,当删除 people,会级联删除 address @JoinColumn(name ="address_id", referencedColumnName ="id")//people中的address_id字段参考address表中的id字段 private Address address;//地址 } 关联的实体的主键一般是用...
JPA 做 ORM(Object Relational Mapping,对象关系映射)时,为了开发效率,通常会在实体类上用 Hibernate 的关系映射注解。 包括:@OneToOne、@OneToMany、@ManyToOne、@ManyToMany、@JoinTable、以及@JoinColumn以及OrderBy; JPA 中@JoinColumn与 @OneToMany 等关系注解之间用法 @JoinColumn定义多个字段之间的关联关系,配合@One...
@Column(name= "numOfPages")privateintnumOfPages; @OneToOne(cascade= CascadeType.ALL, mappedBy = "bookDetail")privateBook book;publicBook getBook() {returnbook; }publicvoidsetBook(Book book) {this.book =book; }publiclonggetId() {returnid; }publicvoidsetId(longid) {this.id =id; }publ...
@OneToOne注解 @Target({ElementType.METHOD,ElementType.FIELD}) @Retention(RetentionPolicy.RUNTIME) public@interfaceOneToOne{ ClasstargetEntity()defaultvoid.class; CascadeType[]cascade()default{}; FetchTypefetch()defaultFetchType.EAGER; booleanoptional()defaulttrue; ...
@OneToOne(cascade= CascadeType.ALL, mappedBy = "bookDetail")privateBook book;publicBook getBook() {returnbook; }publicvoidsetBook(Book book) {this.book =book; }publiclonggetId() {returnid; }publicvoidsetId(longid) {this.id =id; ...
@OneToOne(cascade = CascadeType.ALL) @JoinColumn(name = "aid",referencedColumnName = "aid") private Address address; @Column(insertable = false,updatable = false) private Integer aid; } 在Address 中自定义一个 sid,并设置该字段不可添加和修改,然后通过 @JoinColumn 注解去指定关联关系,@JoinColumn...
AUTO) private int id; private String name; @OneToOne(cascade = CascadeType.ALL, mappedBy = "book") private BookDetail bookDetail; public Book() { } public Book(String name) { this.name = name; } public Book(String name, BookDetail bookDetail) { this.name = name; this.bookDetail =...
@GeneratedValue(strategy=GenerationType.IDENTITY)privateInteger sid;privateString name;@OneToOne(cascade=CascadeType.ALL)privateAddress address;} 一对一的关系,可以只在 School 中维护,也可以只在 Address 中维护,也可以两者都维护,具体哪种,那就看需求了。
@OneToOne(targetEntity = CardEntity.class, cascade = {CascadeType.PERSIST, CascadeType.REMOVE}) private CardEntity cardEntity; controller: @GetMapping("/jpatest1") public List<PeopleEntity> jpaTest1() { CardEntity cardEntity = new CardEntity("xx2", "昆明"); ...