@OneToOne表示两个entity一一对应 --- 两个entity就意味着数据库里有两张表! @OneToOnedefines a one-to-one relationship with another entity. @JoinColumnindicates the entity is the owner of the relationship: the corresponding table has a column with a foreign key to the referenced table. @mapped...
@OneToOne表示两个entity一一对应 --- 两个entity就意味着数据库里有两张表! @OneToOnedefines a one-to-one relationship with another entity. @JoinColumnindicates the entity is the owner of the relationship: the corresponding table has a column with a foreign key to the referenced table. @mapped...
引用是关系的所有者，需要在单向或双向关系中指定引用
在sql模式定义和迁移脚本中，我将TEMP_DATA_ID更改为DMD_FILE_ID，并添加了外键约束 ...
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 ...
11.JPA @OneToOne with Shared ID -- Can I do this Better?stackoverflow.com I’m working with an existing schema that I’d rather not change. The schema has a one-to-one relationship between tables Person and VitalStats, where Person has a primary key and VitalStats ... ...
Aspreviously explained, the one-to-one database table relationship requires the Primary Key to be shared among the parent and the child tables. Unfortunately, just adding the JPA@OneToOneannotation in the child entity does not render a true one-to-one table relationship since a separate Foreign...
Spring Boot @OneToMany tutorial shows how to create one-to-many relationship in a Spring Boot application.
javax.persistence.OneToOne.mappedBy JPA Annotation Attribute injavax.persistence.OneToOne String mappedBydefault "" (Optional) The field that owns the relationship. This element is only specified on the inverse (non-owning) side of the association....
https://vladmihalcea.com/the-best-way-to-map-a-onetoone-relationship-with-jpa-and-hibernate/ ...