将现有父对象持久化到子对象时出现java问题

Question

我有一个带有预填充数据的现有表操作，我正在尝试保存一个包含该操作的对象停止。Id作为外键。下面是我试过的代码。但在停止表中，即使没有错误，也不会保存引用

  public class Stop {

    @OneToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "ACTION_ID", updatable = false, insertable = false)
    private Action action;
}

public class Action {

    @Id
    @Column(name = "ACTION_ID")
    private String actionId;

    @OneToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "ACTION_ID")
    private Stop stops;
}

我尝试显式调用Optional<Action> action = actionRepo.findByActionId("ARRIVE")并设置为stop对象。但它并没有保存参考

Answer 1

为JPA对象设置新值后，需要调用save

Optional<Action> action = actionRepo.findByActionId("ARRIVE");
    if (action.isPresent()){
    actionRepo.save(action.get().setActionName("balal"));
}

Answer 2

我认为您需要从Action类中删除@JoinColumn注释。通常情况下，双方都不需要

public class Stop {
    @OneToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "ACTION_ID", updatable = false, insertable = false)
    private Action action;
}

public class Action {
    @Id
    @Column(name = "ACTION_ID")
    private String actionId;

    @OneToOne(fetch = FetchType.LAZY)
    private Stop stops;
}