@PrimaryKeyJoinColumn 在三种情况下会用到PrimaryKeyJoinColumn。 继承。 entity class映射到一个或多个从表。...referencedColumnName:该列引用列的列名 columnDefinition: 定义建表时创建此列的DDL @PrimaryKeyJoinColumns 如果entity class使用了复合主键,指定单个PrimaryKeyJoinColumn...不能满足要求时,可以用PrimaryKeyJoinColumns来定义多个PrimaryKeyJoinColumn 多表关联的注解 @OneToOne,@ManyToOne,@OneToMany,@ManyToMany
Entity public class Body { @Id public Long getId() { return id; } @OneToOne(cascade = CascadeType.ALL) @PrimaryKeyJoinColumn...getHeart() { return heart; } ... } @Entity public class Heart { @Id public Long getId() { ...} } 通过@PrimaryKeyJoinColumn
student_id",referencedColumnName = "id") name = 本表的属性 referencedColumnName 关联student中的字段 @JoinColumn和@PrimaryKeyJoinColumn...的区别 Use PrimaryKeyJoinColumn Use JoinColumn 地址:https://stackoverflow.com/questions/3417097/jpa-difference-between-joincolumn-and-primarykeyjoincolumn
有时候会看到注解 @PrimaryKeyJoinColumn(name = "...") ,其实它本质上是 @Id 与 @JoinColumn(name = "...") 的组合体。
javax.persistence.GeneratedValue; import javax.persistence.Id; import javax.persistence.OneToOne; import javax.persistence.PrimaryKeyJoinColumn...employee") }) private long id; @Column(name = "city") private String city; @OneToOne @PrimaryKeyJoinColumn
javax.persistence.GeneratedValue; import javax.persistence.Id; import javax.persistence.OneToOne; import javax.persistence.PrimaryKeyJoinColumn...private String zipcode; @Column(name = "city") private String city; @OneToOne @PrimaryKeyJoinColumn
@PrimaryKeyJoinColumn主键关联 例: 引用外键 @OneToOne(optional=false) @JoinColumn(name=”CUSTREC_ID”...{ return customer; } 共享主键 @Entity public class Employee { @Id @OneToOne @PrimaryKeyJoinColumn
Group2 是 A2 和 B2 的类,该案例将会把三个实体类都生成各自的表,当我们在添加 A2 或者 B2 数据进入数据库的时候 ,Group2 对用也会相应的添加一条数据, 子类中有一个注解 @PrimaryKeyJoinColumn
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