Parent data is saving but list of children data is not saving in table.
data from postman
{"billno":"nur-1001", "grandTotal": 5000,"billcart":[{"itemcode":"SU10027", "soldPrice":0},{"itemcode":"SU10027","soldPrice":1100}]}
Bill is parent Entity & billcart is child entity
#NoArgsConstructor #AllArgsConstructor #Data #Entity
public class Bill {
#Id
#GeneratedValue(strategy=GenerationType.IDENTITY)
private Long id;
private String billno;
private Long grandTotal;
#OneToMany(mappedBy = "bill", cascade = CascadeType.ALL)
#JsonIgnore
private List<Billcart> billcart = new ArrayList<>();
public Bill( String billno, Long grandTotal, List<Billcart> billcart) {
this.billno = billno;
this.grandTotal = grandTotal;
this.billcart = billcart;
this.billcart.forEach(e -> e.setBill(this));
}
}
child entity
#NoArgsConstructor #AllArgsConstructor #Data #Entity
public class Billcart {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
private String itemcode;
private Integer soldPrice;
#ManyToOne(fetch = FetchType.LAZY)
#JoinColumn(name = "bill_id")
private Bill bill;
controller
public void saveBill(#RequestBody Bill request) {
List<Billcart> billscart = request.getBillcart().stream()
.map(e -> new Billcart(e))
.collect(Collectors.toList());
Bill bill = new Bill(request.getBillno(), request.getGrandTotal() , billscart);
billRepository.save(bill);
Related
i want to implement a many to many association with quantity information in it . like this :
#Entity
#Table(name = "reserves")
#Getter #Setter #NoArgsConstructor
public class Reserve {
#Id
#ManyToOne(cascade = CascadeType.ALL,fetch = FetchType.EAGER)
#JoinColumn(name = "groupe_id")
private GroupeSanguin bloodGroup;
#Id
#ManyToOne(cascade = CascadeType.ALL,fetch = FetchType.EAGER)
private Banque banque;
private int quantity;
}
the GroupSanguin and the Banque are two class stored in the database two . here is the code for the two if you need :
#Entity
#Table(name = "groupe_sanguins")
public class GroupeSanguin {
#Id
private String groupe;
#OneToMany(mappedBy = "groupeSanguin")
private List<Donneur> donneurs;
}
#Entity #Getter #Setter #NoArgsConstructor
public class Banque {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
#Column(unique = true,nullable = false)
private String nom;
private String adresse;
#Column(unique = true)
private String telephone;
private String localisation;
}
so my i want to know how to annotate the JpaRepository to take the two as primary key like this and is my annotation good for it to work ?
public interface ReserveRepository extends JpaRepository<
Reserve,
//what to put here ?
>
This isn't a JPA question in fact, it's a relationnal database conception.
If Reserve has is own data and links with other entity it has it own Id
You can add unicity constraint
#Entity
#Table(name = "reserves", uniqueConstraints={
#UniqueConstraint(columnNames = {"banque_id", "groupe_id"})
#Getter #Setter #NoArgsConstructor
public class Reserve {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
#ManyToOne(cascade = CascadeType.ALL,fetch = FetchType.EAGER)
#JoinColumn(name = "groupe_id")
private GroupeSanguin bloodGroup;
#ManyToOne(cascade = CascadeType.ALL,fetch = FetchType.EAGER)
#JoinColumn(name = "banque_id")
private Banque banque;
private int quantity;
}
i've found this solutions too.
#Entity
#Table(name = "reserves")
#Getter #Setter #NoArgsConstructor
#IdClass(ReserveId.class) //this annotation will tell that id that the
// the id will be represented by a class
public class Reserve {
#Id
#ManyToOne(cascade = CascadeType.ALL,fetch = FetchType.EAGER)
#JoinColumn(name = "groupe_id")
private GroupeSanguin groupeSanguin;
#Id
#ManyToOne(cascade = CascadeType.ALL,fetch = FetchType.EAGER)
#JoinColumn(name = "banque_id")
private Banque banque;
private int quantity;
}
and the id class should implements Serializable like this :
#Getter #Setter
public class ReserveId implements Serializable {
private Banque banque;
private GroupeSanguin groupeSanguin;
}
and finally the repository will be like that :
#Repository
public interface ReserveRepo extends JpaRepository<Reserve, ReserveId>{}
See your Reserve class has nowhere mentioned composite primary key. First you need to fix the model, You can refer to the solution here How to create and handle composite primary key in JPA
#Getter #Setter #NoArgsConstructor #AllArgsConstructor
#Table(name = "my_users")
public class MyUsers {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
#Column(nullable = false)
private Long id;
#Column(nullable = false, unique = true)
private String userName;
private String password;
#ManyToMany
private List<MyUsers> connections;
}
This is my MyUsers Model Class. I am using Hibernate and MySQL.
#ManyToMany
private List<MyUsers> connections;
This ManyToMany relationship is automatically creating the table 'my_users_connections' with 'my_users_id' and 'connections_id' colums. How can I add extra columns to this auto mapped table?
It's not ideal solution...
#Getter
#Setter
#NoArgsConstructor
#AllArgsConstructor
#Entity
#Table(name = "my_users")
public class MyUsers implements Serializable {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
#Column(nullable = false)
private Long myUsersId;
#Column(nullable = false, unique = false)
private String userName;
private String password;
#ManyToMany(cascade = CascadeType.ALL)
#JoinTable(name = "my_users_connections",
joinColumns = { #JoinColumn(name = "my_users_id") },
inverseJoinColumns = { #JoinColumn(name = "connections_id") })
private List<MyUsers> connections;
}
Create embedded id MyUsersConnectionsPK:
#Data
#Embeddable
public class MyUsersConnectionsPK implements Serializable {
#Column(name = "my_users_id")
private Long myUsersId;
#Column(name = "connections_id")
private Long connectionsId;
}
Create MyUsersConnections, which represent ManyToMany
#Data
#Entity
#Table(name = "my_users_connections")
public class MyUsersConnections implements Serializable {
#EmbeddedId
private MyUsersConnectionsPK id;
#ManyToOne
#MapsId("my_users_id")
#JoinColumn(name = "my_users_id")
private MyUsers myUsersId;
#ManyToOne
#MapsId("connections_id")
#JoinColumn(name = "connections_id")
private MyUsers connectionsId;
#Column(name = "extra_column")
private String extraColumn;
}
Create JPA repository
#Repository
public interface MyUsersConnectionsRepository extends JpaRepository<MyUsersConnections, MyUsersConnectionsPK> {
List<MyUsersConnections> findMyUsersConnectionsByMyUsersIdMyUsersId(Long id);
}
And simple sample for using:
#Service
public class Test {
#Autowired
private MyUsersConnectionsRepository myUsersConnectionsRepository;
#Autowired
private MyUsersRepository myUsersRepository;
public void test() {
MyUsers myUsers = new MyUsers();
myUsers.setUserName("user name");
myUsers.setPassword("password");
MyUsers myUsers2 = new MyUsers();
myUsers2.setUserName("user name 2");
myUsers2.setPassword("password 2");
myUsers.setConnections(Collections.singletonList(myUsers2));
myUsers = myUsersRepository.saveAndFlush(myUsers);
List<MyUsersConnections> myUsersConnections = myUsersConnectionsRepository.findMyUsersConnectionsByMyUsersIdMyUsersId(myUsers.getMyUsersId());
MyUsersConnections item = myUsersConnections.get(0);
item.setExtraColumn("Extra column");
myUsersConnectionsRepository.saveAndFlush(item);
}
}
I'm having a problem with, fetch = FetchType.LAZY, it just doesn't work. I've already spent a lot of time solving this problem, can anyone help with this? I'll be very thankful. I have a genre and a country that are associated with movie manyTomany. No matter how hard I try to initialize the LAZY download, it doesn't work.I need the movie to have EAGER, and the genre and country to have LAZY.
I expect to get movie with its genre and country, But with SELECT * FROM movie WHERE id = 1 - I get an endless loop, although genre and country has LAZY download.
Sample code - below
Entities:
Movie
#Entity
#Getter
#Setter
#ToString(of = {"id", "year", "name"})
#EqualsAndHashCode(of = {"id", "year"})
#NoArgsConstructor
#AllArgsConstructor
public class Movie {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private long id;
**********
#ManyToMany(fetch = FetchType.EAGER)
#JoinTable(
name = "movie_genre",
joinColumns = {
#JoinColumn(name = "movie_id")},
inverseJoinColumns = {
#JoinColumn(name = "genre_id")})
private Set<Genre> genres = new HashSet<>();
#ManyToMany(fetch = FetchType.EAGER)
#JoinTable(
name = "movie_country",
joinColumns = {
#JoinColumn(name = "movie_id")},
inverseJoinColumns = {
#JoinColumn(name = "country_id")})
private Set<Country> countries = new HashSet<>();
}
Genre
#Entity
#Getter
#Setter
#ToString(exclude = "movies")
#EqualsAndHashCode(exclude = "movies")
#NoArgsConstructor
#AllArgsConstructor
public class Genre {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private int id;
#Size(max = 20)
private String name;
#ManyToMany(mappedBy = "genres")
private Set<Movie> movies = new HashSet<>();
}
Country
#Entity
#Getter
#Setter
#ToString(exclude = "movies")
#EqualsAndHashCode(exclude = "movies")
#NoArgsConstructor
#AllArgsConstructor
public class Country {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private int id;
#Size(max = 20)
private String name;
#ManyToMany(mappedBy = "countries")
private Set<Movie> movies = new HashSet<>();
}
Controller
#RestController
public class TestController {
#Autowired
private MovieService movieService;
#Autowired
private CountryService countryService;
#Autowired
private GenreService genreService;
#GetMapping("movie")
public List<Movie> getMovieMovie(){
return movieService.getAll();
}
#GetMapping("movie/add")
public Movie create(){
Movie movie = new Movie();
movie.setName("test");
movie.setImg("test");
movie.setTime("test");
movie.setYear((short) 2332);
movie.setMovieLink("test");
movie.getCountries().add(countryService.getCountry(1));
movie.getGenres().add(genreService.getGenre(1));
return movieService.create(movie);
}
}
Service
#Service
public class MovieService {
#Autowired
private MovieRepository movieRepository;
public List<Movie> getAll(){
return movieRepository.findAll();
}
#Transactional
public Movie create(Movie mocie){
return movieRepository.save(mocie);
}
}
Lazy loading works as expected, as it loads all data lazy.
What you are looking for is a way to break loop in the bi-directional mapping.
There you can use #JsonManagedReference and #JsonBackReference that you have to set on the relationships.
Please also read this: https://www.baeldung.com/jackson-bidirectional-relationships-and-infinite-recursion
I have the below room entity which has many disponibilities, when i add a room with a list of disponibilities, the room is saved but the list is not. what am i missing in the relationship ?
#Entity
public class RoomEntity {
#Id
private String classRoomId;
private String label;
#OneToMany(mappedBy = "room", fetch = FetchType.LAZY, cascade = CascadeType.ALL)
private List<DisponibilityEntity> disponibilities;
public void addDisponibilities(List<DisponibilityEntity> disponibilityEntities) {
if (CollectionUtils.isEmpty(disponibilities)) {
disponibilities = new ArrayList<>();
}
disponibilities.addAll(disponibilityEntities);
disponibilityEntities.forEach(item -> item.setRoom(this));
}
}
#Entity
public class DisponibilityEntity {
#Id
private String disponibilityId;
#JsonIgnore
#ManyToOne(fetch = FetchType.LAZY)
#JoinColumn(name = "fk_room")
private RoomEntity room;
}
roomEntity.addDisponibilities(classRoomEntity.getDisponibilities());
roomRepository.save(roomEntity);
The problem is when I want to delete user I'm getting error in Spring Boot like that:
java.sql.SQLIntegrityConstraintViolationException: Cannot delete or update a parent row: a foreign key constraint fails (32506632_pam.badge, CONSTRAINT FK4aamfo6o0h5ejqjn40fv40jdw FOREIGN KEY (user_id) REFERENCES user (id))
I'm guessing that I need to delete data in cascade way. So I've placed CascadeType.REMOVE value to #OneToOne annotation like that, but it doesn't work:
badge entity
#Entity
#Data
#Table(name = "badge")
#AllArgsConstructor
#NoArgsConstructor
public class Badge {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
#JsonManagedReference
#ManyToMany(mappedBy = "badges", fetch = FetchType.LAZY)
private List<Reader> readers;
#OneToOne(cascade = CascadeType.REMOVE, orphanRemoval=true)
#JoinColumn(name = "user_id")
private User user;
private String number;
#Lob
#Basic(fetch = FetchType.LAZY)
private byte[] photo;
}
user entity
#Entity
#Data
#Table(name = "user")
#AllArgsConstructor
#NoArgsConstructor
public class User {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
private String name;
private String lastname;
private String pesel;
private String email;
private String telephone;
private Integer age;
private String gender;
}
reader entity
#Entity
#Data
#Table(name = "reader")
#AllArgsConstructor
#NoArgsConstructor
public class Reader {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
#JsonBackReference
#ManyToMany(fetch = FetchType.LAZY)
private List<Badge> badges;
private String department;
private String room;
private Boolean status;
}
Class which loads initial data
#Component
public class DataLoader implements ApplicationRunner {
#Autowired
private UserService userService;
#Autowired
private BadgeService badgeService;
#Autowired
private ReaderService readerService;
#Override
public void run(ApplicationArguments args) throws Exception {
User user1 = new User(null, "Jan", "Kowal", "11111111111", "jan#kowal.pl", "+48111111111", new Integer(23), "male");
userService.saveUser(user1);
Reader reader1 = new Reader(null, null, "Warehouse", "207A", new Boolean("true"));
Badge badge1 = new Badge(null, Arrays.asList(reader1), user1, "738604289120", null);
badgeService.saveBadge(badge1);
reader1.setBadges(Arrays.asList(badge1));
readerService.saveReader(reader1);
}
}
Endpoint for deleting user - it uses repository which extends CrudRepository and uses default delete behavior.
#DeleteMapping("/deleteUserById/{id}")
private void deleteUserById(#PathVariable Long id) {
userService.deleteUserById(id);
}
Database structure in phpmyadmin
My goal is to delete user and associated badge with him, then to delete row in reader_badges table.