CODEWITHSUNDEEP
spring-boothibernatespring-data-jpa
Matelutex
Matelutex

Reputation: 2220

Spring Boot + JPA (Hibernate) - how to update some fields

I have to update my entity - when placeA or/and placeB is updated, I have to also update points. SO I fetch route object from database and modify one or two fields (placeA, placeB). The problem is that I have to update points accordingly -> in Point object I have to also update pointAddress (point.pointAddress has to be updated to route.placeA or route.placeB values):

public class Route{

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @ManyToOne(cascade = CascadeType.ALL, fetch = FetchType.LAZY)
    @JoinColumn(name = "place_a_id")
    private Address placeA;

    @ManyToOne(cascade = CascadeType.ALL, fetch = FetchType.LAZY)
    @JoinColumn(name = "place_b_id")
    private Address placeB;

    @OneToMany(mappedBy = "route", cascade = CascadeType.ALL)
    List<Point> points;

public class Point{

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;


    @OneToMany(mappedBy = "point", cascade = CascadeType.ALL, fetch = FetchType.LAZY)
    private List<PointDetail> pointDetails;

    @ManyToOne(cascade = CascadeType.ALL, fetch = FetchType.LAZY)
    @JoinColumn(name = "route_id", nullable = false)
    private Route route;

    @ManyToOne(cascade = CascadeType.ALL, fetch = FetchType.LAZY)
    @JoinColumn(name = "route_address_id", nullable = false)
    private Address pointAddress;

public class PointDetail{

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "point_id", nullable = false)
    private Point point;

And I fetch Route entity from db and from now this object is in persistent state (everything within the same transaction) so I don't need to invoke repository.save(myChangedRoute) explicitly.

The question is how to update route.points[0].pointAddress?

Is it sufficient?

Route route = repository.findRouteById(1L);
route.setPointA("new place");
route.getPoints().get(0).setPointAddress("new place")

And what with route.getPoints().get(0).getRoute() and route.getPoints().get(0).getPointDetails() objects? For example should I also update route.getPoints().get(0).getPointDetails() object? PointDetail objects have a field point that maybe should be also updated?

I have related (nested) objects in my Route object (dependencies) so my question is how to update my object structure properly to not overwrite new values with the old nested ones that are not updated, e.g. I updated: route.getPoints().get(0).setPointAddress("new place")

but I haven't updated route.getPoints().get(0).getPointDetails().get(0).setPoint(MY NEW UPDATED AND NOT YET SAVED Point object)???

SO we have a circular dependencies route -> point -> pointDetail -> point and the question is if it's sufficient to update only pointAddress in my route.point object or I have to also update pointAddress in route.point.pointDetail.point?

Upvotes: 0

Views: 162

Answers (2)

Morteza
Morteza

Reputation: 662

First of all: point -> pointDetail -> point is not a curricular dependecny. The relation between pointDetail and point is BiDirectional dependency.

PointDetail objects have a field point that maybe should be also updated? Of course not.

and the question is if it's sufficient to update only pointAddress in my route.point? Yes that is enough.

Upvotes: 1

Boris Kukec
Boris Kukec

Reputation: 721

Hibernate has the first level cache it ensures that objects will be loaded only once per session. So no override can occur. Of course, is up to you and your code how will you update properties and in which order.

Upvotes: 0

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