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);
Related
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);
I use OneToOne in the spring data JPA and I want to delete a record from the Address table without touching the user. But I can't.
If I remove User, in this case Address is removed, that's good.
But how can you delete an Address without touching the User?
https://github.com/myTestPercon/TestCascade
User.Java
#Entity
#Table(name = "user", schema = "testCascade")
public class User implements Serializable {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "id")
private Long id;
#Column(name = "name")
private String name;
#OneToOne(mappedBy = "user", cascade = CascadeType.ALL)
private Address address;
// Getter and Setter ...
}
Address.java
#Entity
#Table(name = "address", schema = "testCascade")
public class Address implements Serializable {
#Id
private Long id;
#Column(name = "city")
private String city;
#OneToOne
#MapsId
#JoinColumn(name = "id")
private User user;
// Getter and Setter ...
}
DeleteController.java
#Controller
public class DeleteController {
#Autowired
ServiceJpa serviceJpa;
#GetMapping(value = "/deleteAddressById")
public String deleteAddressById () {
serviceJpa.deleteAddressById(4L);
return "redirect:/home";
}
}
You got your mapping wrong thats all is the problem .
try the below and see
User.java
#Entity
#Table(name = "user", schema = "testCascade")
public class User implements Serializable {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "id")
private Long id;
#Column(name = "name")
private String name;
#OneToOne(cascade=CascadeType.ALL)
#JoinColumn(name="foriegn key column in user table for address example.. address_id")
private Address address;
// Getter and Setter ...
}
Address.java
#Entity
#Table(name = "address", schema = "testCascade")
public class Address implements Serializable {
#Id
private Long id;
#Column(name = "city")
private String city;
//name of the address variable in your user class
#OneToOne(mappedBy="address",
cascade={CascadeType.DETACH, CascadeType.MERGE, CascadeType.PERSIST,
CascadeType.REFRESH})
private User user;
// Getter and Setter ...
}
In order to solve this problem, you need to read the hibernate Documentation Hibernate Example 162, Example 163, Example 164.
And also I recommend to look at this is Using #PrimaryKeyJoinColumn annotation in spring data jpa
This helped me in solving this problem.
And also you need to specify the parameter orphanRemoval = true
User.java
#Entity(name = "User")
#Table(name = "user", schema = "testother")
public class User implements Serializable {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "id")
private Long id;
#Column(name = "name")
private String name;
#OneToOne(mappedBy = "user", cascade = CascadeType.ALL, orphanRemoval = true)
private Address address;
public void addAddress(Address address) {
address.setUser( this );
this.address = address;
}
public void removeAddress() {
if ( address != null ) {
address.setUser( null );
this.address = null;
}
}
// Getter and Setter
}
Address.java
#Entity(name = "Address")
#Table(name = "address", schema = "testother")
public class Address implements Serializable {
#Id
private Long id;
#Column(name = "city")
private String city;
#OneToOne
#MapsId
#JoinColumn(name = "id")
private User user;
// Getter and Setter
}
DeleteController .java
#Controller
public class DeleteController {
#Autowired
ServiceJpa serviceJpa;
#GetMapping(value = "/deleteUser")
public String deleteUser () {
User user = serviceJpa.findUserById(2L).get();
user.removeAddress();
serviceJpa.saveUser(user);
return "/deleteUser";
}
}
Or make a custom SQL query.
#Repository
public interface DeleteAddress extends JpaRepository<Address, Long> {
#Modifying
#Query("delete from Address b where b.id=:id")
void deleteBooks(#Param("id") Long id);
}
public class Address {
#Id
private Long id;
#MapsId
#JoinColumn(name = "id")
private User user;
}
Rename #JoinColumn(name = "id") to #JoinColumn(name = "user_id")
You can't say that the column that will point to user will be the id of the Address
I am trying to use Hibernate to remove an entity however I get an error: Cannot delete or update a parent row: a foreign key constraint fails
The setup is that I have an abstract class A and two classes (B and C) which extend A. B contains a list of C's (unidirectional relationship). And there is a function to delete A by its ID.
Note: Stuff has been removed for brevity.
#Entity
public class B extends A {
#ManyToMany(fetch = FetchType.EAGER)
#JoinTable(
joinColumns = #JoinColumn(name = "B_A_id"),
inverseJoinColumns = #JoinColumn(name = "C_A_id"))
List<C> cList;
}
#Entity
public class C extends A {
(no reference to B)
}
The issue is that when the deleteAByFixedId is called where A is a C, it tries to delete the C before it deletes the B which references it and therefore I get a foreign key constraint failure.
What am I doing wrong?
The answer will still be updated.
Links:
The best way to use the #ManyToMany annotation with JPA and Hibernate
Hibernate Inheritance Mapping
#ManyToMany
Unidirectional example:
User.java
#Entity
public class User {
#Id
#GeneratedValue
#Column(name = "user_id")
private long id;
...
#ManyToMany(fetch = FetchType.LAZY, cascade = CascadeType.ALL)
#JoinTable(name = "user_role", joinColumns = #JoinColumn(name = "user_id"), inverseJoinColumns = #JoinColumn(name = "role_id"))
private Set<Role> roles = new HashSet<>();
public void addRoles(Role role) {
roles.add(role);
}
public void removeRoles(Role role) {
roles.remove(role);
}
}
Role.java
#Entity
public class Role {
#Id
#GeneratedValue
#Column(name = "role_id")
private int id;
#Column(name = "role")
private String role;
}
Bidirectional example:
Trader.java:
#Data
#AllArgsConstructor
#NoArgsConstructor
#Entity
#ToString(exclude = "stockmarkets")
#Table(name = "trader")
public class Trader {
#Id
#GeneratedValue
#Column(name = "trader_id")
private Long id;
#Column(name = "trader_name")
private String traderName;
#ManyToMany(fetch = FetchType.LAZY,
cascade = {
CascadeType.PERSIST,
CascadeType.MERGE
})
#JoinTable(name = "TRADER_STOCKMARKET",
joinColumns = { #JoinColumn(name = "trader_id") },
inverseJoinColumns = { #JoinColumn(name = "stockmarket_id") })
private Set<Stockmarket> stockmarkets = new HashSet<>();
/*
We need to add methods below to make everything work correctly
*/
public void addStockmarket(Stockmarket stockmarket) {
stockmarkets.add(stockmarket);
stockmarket.getTraders().add(this);
}
public void removeStockmarket(Stockmarket stockmarket) {
stockmarkets.remove(stockmarket);
stockmarket.getTraders().remove(this);
}
}
Stockmarket.java
#Data
#AllArgsConstructor
#NoArgsConstructor
#Entity
#ToString(exclude = "traders")
#Table(name = "stockmarket")
public class Stockmarket{
#Id
#GeneratedValue
#Column(name = "stockmarket_id")
private Long id;
#Column(name = "stockmarket_name")
private String stockmarketName;
#ManyToMany(mappedBy="stockmarkets")
private Set<Trader> traders = new HashSet<>();
/*
We need to add methods below to make everything work correctly
*/
public void addTrader(Trader trader) {
traders.add(trader);
trader.getStockmarkets().add(this);
}
public void removeTrader(Trader trader) {
traders.remove(trader);
trader.getStockmarkets().remove(this);
}
}
Consider the tables where posts and tags exhibit a many-to-many relationship between each other.
The many-to-many relationship is implemented using a third table called post_tags which contains the details of posts and their associated tags.
Post Model
#Entity
#Table(name = "posts")
public class Post {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
#NotNull
#Size(max = 100)
#Column(unique = true)
private String title;
#NotNull
#Size(max = 250)
private String description;
#NotNull
#Lob
private String content;
#NotNull
#Temporal(TemporalType.TIMESTAMP)
#Column(name = "posted_at")
private Date postedAt = new Date();
#NotNull
#Temporal(TemporalType.TIMESTAMP)
#Column(name = "last_updated_at")
private Date lastUpdatedAt = new Date();
#ManyToMany(fetch = FetchType.LAZY,
cascade = {
CascadeType.PERSIST,
CascadeType.MERGE
})
#JoinTable(name = "post_tags",
joinColumns = { #JoinColumn(name = "post_id") },
inverseJoinColumns = { #JoinColumn(name = "tag_id") })
private Set<Tag> tags = new HashSet<>();
public Post() {
}
public Post(String title, String description, String content) {
this.title = title;
this.description = description;
this.content = content;
}
// Getters and Setters (Omitted for brevity)
}
TAG Model
#Entity
#Table(name = "tags")
public class Tag {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
#NotNull
#Size(max = 100)
#NaturalId
private String name;
#ManyToMany(fetch = FetchType.LAZY,
cascade = {
CascadeType.PERSIST,
CascadeType.MERGE
},
mappedBy = "tags")
private Set<Post> posts = new HashSet<>();
public Tag() {
}
public Tag(String name) {
this.name = name;
}
// Getters and Setters (Omitted for brevity)
}
Problem is
I tried to use an existing tags. and insert happened only on posts & posts_tags table.
Initially i'm Get tag(s) with tagName(s). Once you have the Tag object, you can set it in the Post object and save it.
Like this
Post post = new Post("Hibernate Many to Many Example with Spring Boot",
"Learn how to map a many to many relationship using hibernate",
"Entire Post content with Sample code");
// Create two tags
Tag tag1 = tagService.getTag("Spring Boot");
// Add tag references in the post
post.getTags().add(tag1);
postRepository.save(post);
If I do like that, entry is not available in post_tags table.
Tag Repository and Tag Service:
#Repository
public interface TagRepository extends JpaRepository<Tag, Long> {
#Query("select p from Tag p where p.name = :name")
Tag findByName(#Param("name") String name);
}
#Override
public Tag findByName(String name) {
return repository.findByName(name);
}
I have 2 tables 'orders' and 'orderlines' and used bidirectional OneToMany mapping.When i save the order, record is successfully inserted into table 'orders'.But my 'orderlines' table is empty.No record is inserted.
This is the save operation code in Controller.
#RequestMapping(value = "ordersuccess", method = RequestMethod.POST)
public String processOrder(#ModelAttribute("order") Order order,
#ModelAttribute("cart") Cart cart,
BindingResult result) {
if (!result.hasErrors()) {
Set<OrderLine> orderLines = new HashSet<OrderLine>();
for(CartLine c : cart.getCartLines()) {
OrderLine line = new OrderLine();
line.setOrder(order);
line.setProduct(c.getProduct());
line.setProductPrice(c.getProduct().getPrice());
line.setTotalPrice(c.getPrice());
orderLines.add(line);
order.setOrderLines(orderLines);
}
orderService.save(order);
orderLineService.save(orderLine);
}
return "ordersuccess";
}
Can someone point me what wrong i am doing.
EDIT:
OrderLine.java
public class OrderLine {
#Id
#GeneratedValue
#Column(name="orderline_id")
private int orderline_id;
#ManyToOne
#JoinColumn(name = "order_id")
private Order order;
#ManyToOne(targetEntity = Product.class,
cascade = CascadeType.ALL,
fetch = FetchType.LAZY)
#JoinTable(
name="products",
joinColumns=#JoinColumn(name="product_id")
)
private Product product;
)
Order.java
public class Order {
#Id
#GeneratedValue
#Column(name="id")
private int id;
#OneToMany(mappedBy = "order")
private Set<OrderLine> orderLines;
//getter/setter
The orderLines object is created:
Set<OrderLine> orderLines = new HashSet<OrderLine>();
You then add lines to it:
orderLines.add(line);
But it never attributed to an order or sent to the service layer.
Also the OrderLine.product mapping should be like this
public class OrderLine {
#Id
#GeneratedValue
#Column(name="orderline_id")
private int orderline_id;
#ManyToOne
#JoinColumn(name = "order_id")
private Order order;
#ManyToOne(cascade = CascadeType.ALL)
#JoinColumn(name = "product_id")
private Product product;
}
and Order.orderLines should have a cascade:
public class Order {
#Id
#GeneratedValue
#Column(name="id")
private int id;
#OneToMany(mappedBy = "order", cascade = CascadeType.ALL)
private Set<OrderLine> orderLines;
}
You then need to save the orderLines:
order.setOrderLines(orderLines);
and save the order:
orderService.save(order);
When order is saved it will cascade the orderlines and the associated product too.
If you have bidirectional associations don't forget to set both sides.