I need to put and get data from MySql with spring boot (Hibernate, Jackson)
Sample JSON:
[
{
"name": "Product1",
"colors": [
{
"color": [
"#dddd33",
"#676767"
]
},
{
"color": [
"#FFdDFF"
]
}
]
}
]
Same JSON I want to receive but added "id". What should I do to achieve this?
Object:
#Entity
public class Product {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
#JsonProperty("name")
private String name;
#JsonProperty("colors")
#OneToMany(mappedBy = "product_id")
private Set<Color> colors;
}
#Entity
public class Color {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
#JsonProperty(access = JsonProperty.Access.WRITE_ONLY)
private Long product_id;
#JsonProperty("color")
#CollectionTable(name = "color", joinColumns = #JoinColumn(name = "color_id"))
#Column(name = "color")
#ElementCollection
#OrderBy
private List<String> color;
}
This not work
I get error
java.sql.SQLException: Field 'id' doesn't have a default value
Related
I have following relationship in my spring boot:
public class Clazz {
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Id
#Column(name = "id")
private Integer id;
#Column(name = "lesson_id")
#NotNull(message = "{lesson.is_required}")
private Integer lessonId;
#Column(name = "level_id")
#NotNull(message = "{level.is_required}")
private Integer levelId;
#Column(name = "name")
#NotEmpty(message = "{name.is_required}")
private String name;
#OneToOne
#JoinColumn(name = "lesson_id", referencedColumnName = "id", insertable = false, updatable = false)
private Lesson lesson;
#OneToOne
#JoinColumn(name = "level_id", referencedColumnName = "id", insertable = false, updatable = false)
private Level level;
}
Now my Lesson entity has Level entity:
public class Lesson {
#Id
#Column(name = "id")
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Integer id;
#Column(name = "name")
#NotEmpty(message = "{name.is_required}")
private String name;
#Column(name = "description")
private String description = "";
#OneToMany(cascade = CascadeType.ALL, fetch = FetchType.EAGER)
#JoinColumn(name = "lesson_id")
Collection<Level> levels = new ArrayList<>();
}
And finally my Level class:
public class Level {
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Id
#Column(name = "id", insertable = false, updatable = false)
private Integer id;
#Column(name = "lesson_id")
private Integer lessonId;
#Column(name = "name")
private String name;
#Column(name = "step")
private Integer step;
#Column(name = "description")
private String description="";
}
With this relationship defined, when I fetch data, getting some extra info in my results:
[
{
"id": 2,
"lessonId": 1,
"levelId": 1,
"name": "English Class March",
"branch": {
"id": 1,
"name": "3 mikr branch",
"email": "",
"phone": "",
"address": "3 mikr, foo, bar"
},
"lesson": {
"id": 1,
"name": "math",
"description": "math lesson",
"levels": [
{
"id": 1,
"lessonId": 1,
"name": "First level",
"step": 1,
"description": "1st level descr"
}
]
},
"level": {
"id": 1,
"lessonId": 1,
"name": "First level",
"step": 1,
"description": "1st level descr"
}
}
]
How can I tell JPA not to fetch sub-entities, ideally I do not need levels in lesson field of result.
Use #JsonIgnore. It can be used at setter,getter or field.
Please refer the code below.
public class Lesson {
#Id #Column(name = "id")
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Integer id;
#Column(name = "name")
#NotEmpty(message = "{name.is_required}")
private String name;
#Column(name = "description")
private String description = "";
#JsonIgnore // Add this to ignore the property in json output
#OneToMany(cascade = CascadeType.ALL, fetch = FetchType.EAGER)
#JoinColumn(name = "lesson_id")
Collection<Level> levels = new ArrayList<>();
}
Good night everyone,
I want to model a database that has the following entities and their perspective relationships:
But everytime I run the Java project to create the model at database, what I create is something like this:
There is another way to map this relationship? I'm mapping like that:
Article entity:
#Entity
public class Article {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
#Column(nullable = false)
private Boolean featured;
#Column(nullable = false)
private String title;
#Column(nullable = false)
private String url;
#Column(name = "image_url", nullable = false)
private String imageUrl;
#Column(name = "news_site", nullable = false)
private String newsSite;
#Column(nullable = false)
private String summary;
#Column(name = "published_at", nullable = false)
private String publishedAt;
#OneToMany
#JoinColumn(name = "launches_id")
private List<Launches> launches;
#OneToMany
#JoinColumn(name = "events_id")
private List<Events> events;
}
Launches entity
#Entity
public class Launches {
#Id
private String id;
private String provider;
}
Events entity:
#Entity
public class Events {
#Id
private Long id;
private String provider;
}
And I want to map this JSON, with this same launcher and events appearing in other articles:
{
"id": 4278,
"title": "GAO warns of more JWST delays",
"url": "https://spacenews.com/gao-warns-of-more-jwst-delays/",
"imageUrl": "https://spacenews.com/wp-content/uploads/2019/08/jwst-assembled.jpg",
"newsSite": "SpaceNews",
"summary": "",
"publishedAt": "2020-01-28T23:25:02.000Z",
"updatedAt": "2021-05-18T13:46:00.284Z",
"featured": false,
"launches": [
{
"id": "d0fa4bb2-80ea-4808-af08-7785dde53bf6",
"provider": "Launch Library 2"
}
],
"events": []
},
{
"id": 4304,
"title": "Government watchdog warns of another JWST launch delay",
"url": "https://spaceflightnow.com/2020/01/30/government-watchdog-warns-of-another-jwst-launch-delay/",
"imageUrl": "https://mk0spaceflightnoa02a.kinstacdn.com/wp-content/uploads/2020/01/48936479373_2d8a120c8e_k.jpg",
"newsSite": "Spaceflight Now",
"summary": "",
"publishedAt": "2020-01-30T04:08:00.000Z",
"updatedAt": "2021-05-18T13:46:01.640Z",
"featured": false,
"launches": [
{
"id": "d0fa4bb2-80ea-4808-af08-7785dde53bf6",
"provider": "Launch Library 2"
}
],
"events": []
}
According to your diagram, it should be:
#ManyToOne
#JoinColumn(name = "launches_id")
private Launches launches;
#ManyToOne
#JoinColumn(name = "events_id")
private Events events;
...and not #OneToMany ;) (Can there be an "Article" (with id=x) having launchers_id=y AND launchers_id=z? No, vice versa!:)
...for the #OneToMany, you should find the join columns "on the other side" (of relationship(s)).
According to your JSON, it is OneToMany. But then, we have to draw/expect:
#Entity
class Article {
//... id, columns, blah
#OneToMany
#JoinColumn(name = "article_id") // Launches "owns the relationship"/column
private List<Launches> launches;
#OneToMany
#JoinColumn(name = "article_id") // Events...!
private List<Events> events;
}
Generally, (when you expose your db model via json,) ensure:
no "circles" (in bi-directional associations). (#JsonManagedReference, #JsonBackReference, #JsonIgnoreProperties, ... )
not to expose data, that you don't want to expose. (#JsonIgnoreProperties, ...)
Regarding Hibernate-ManyToOne, please refer to https://vladmihalcea.com/the-best-way-to-map-a-onetomany-association-with-jpa-and-hibernate/
Regarding spring-data-jpa, best to:
gs-data-jpa
gs-data-rest
spring-boot-ref, data-jpa
reference-doc, data-jpa
reference-doc, data-rest
I have these entities:
#Entity
#Data
#NoArgsConstructor
public class Hero {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private long id;
#NotNull
private String name;
#OneToMany(mappedBy = "character", cascade = CascadeType.ALL, orphanRemoval = true)
#NotEmpty
private List<HeroSkill> heroSkills;
}
#Entity
#Data
#NoArgsConstructor
public class Skill {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private long id;
#Column(nullable = false)
private String name;
}
#Entity
#Data
#NoArgsConstructor
public class HeroSkill {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private long id;
#ManyToOne
#JoinColumn(name = "hero_id", referencedColumnName = "id")
#JsonIgnore
private Hero hero;
#ManyToOne
#JoinColumn(name = "skill_id", nullable = false)
private Skill skill;
private int ranks;
}
My HeroService is like this:
#Transactional
public void create(Hero hero) {
heroRepository.save(hero);
}
I am using postman to create a new Hero and this is a sample POST request:
{
"name": "Test",
"heroSkills": [
{
"skill": {
"id": 1
},
"ranks": 4
},
{
"skill": {
"id": 2
},
"ranks": 4
}
]
}
Although a hero is created and two entities on HeroSkill table are also created, the HeroSkill hero_id column is null, so my new heroes are not associated with their skills as they should be.
It works if I modify my service like this:
#Transactional
public void save(Hero hero) {
Hero result = heroRepository.save(hero);
hero.getHeroSkills().stream()
.forEach(it -> {
it.setHero(result);
heroSkillRepository.save(it);
});
}
But I think that I shouldn't have to pass the Hero manually to each HeroSkill. Isn't that the point of adding CascateType.ALL (which includes CascadeType.PERSIST)?
What is the correct approach to that?
Thanks in advance.
There is no reference of Hero(Parent) in HeroSkill(child) that's why JPA can't resolve hero_id and set as null. Use this heroSkill.setHero(hero) to set parent in child.
To save child with parent in bidirectional relation you have to make sync both side.
hero.getHeroSkills().stream()
.forEach(it -> {
it.setHero(hero);
});
Hero result = heroRepository.save(hero);
I am developing simple API for practice project Online Shopping system. Since I am very new in working with APIs, I am having a trouble with my Entities and relationships. First, I give all my schema and classes before introduce the problem.
Here is a link for my database schema.
These are #Entity classes:
----
#Entity
#Table(name = "Customer")
public class Customer {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
#Column(name = "id")
private int id;
#Column(name = "name")
private String name;
#Column(name = "country")
private String country;
#OneToMany(mappedBy = "customer", cascade = CascadeType.ALL, orphanRemoval = true)
private List<Order> orders = new ArrayList<>();
// constructor, getters, setters ....
#Entity
#Table(name = "Order")
public class Order {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
#Column(name = "id")
private int id;
#Column(name = "date")
private Date date;
#ManyToOne(fetch = FetchType.LAZY)
#JoinColumn(name = "cust_id", nullable = false)
#JsonIgnore
private Customer customer;
#OneToMany(mappedBy = "order", cascade = CascadeType.ALL, orphanRemoval = true)
private List<Detail> details = new ArrayList<>();
#OneToMany(mappedBy = "order", cascade = CascadeType.ALL, orphanRemoval = true)
private List<Invoice> invoices = new ArrayList<>();
//constructor, setters, getters ....
#Entity
#Table(name = "Product")
public class Product {
#Id
#GeneratedValue
#Column(name = "id")
private int id;
#Column(name = "name")
private String name;
#Column(name = "description")
private String description;
#Column(name = "price")
private Double price;
#OneToMany(mappedBy = "product", cascade = CascadeType.ALL, orphanRemoval = true)
private List<Detail> orderDetails = new ArrayList<>();
//cons, setters, getters ...
#Entity
#Table(name = "Detail")
public class Detail {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private int id;
#ManyToOne(fetch = FetchType.LAZY)
#JoinColumn(name = "ord_id", nullable = false)
#JsonIgnore
private Order order;
#ManyToOne(fetch = FetchType.LAZY)
#JoinColumn(name = "pr_id", nullable = false)
#JsonIgnore
private Product product;
#Column(name = "quantity")
private int quantity;
//similar classes for Invoice and Payment (no problem with them)
Here is my Sample Repository class:
#Repository
public interface ProductRepository extends JpaRepository<Product, Integer> {
}
Also here is my controller class:
#RestController
public class OnlineShoppingApiController {
#Autowired
ProductRepository productRepository;
#Autowired
OrderRepository orderRepository;
#Autowired
CustomerRepository customerRepository;
#Autowired
DetailRepository detailRepository;
#Autowired
InvoiceRepository invoiceRepository;
#Autowired
PaymentRepository paymentRepository;
#GetMapping("/products")
public List<Product> getProductsList(){
return productRepository.findAll();
}
#GetMapping("/customers")
public List<Customer> getCustomersList(){
return customerRepository.findAll();
}
#GetMapping("/orders")
public List<Order> getOrdersList(){
return orderRepository.findAll();
}
#GetMapping("/invoices")
public List<Invoice> getInvoicesList(){
return invoiceRepository.findAll();
}
#GetMapping("/payments")
public List<Payment> getPaymentsList(){
return paymentRepository.findAll();
}
#GetMapping("/details")
public List<Detail> getDetailsList(){
return detailRepository.findAll();
}
I am doing the same approach for all APIs and relationships.
When I call for /products in postman, I am getting result JSON like this:
[{
"id": 3,
"name": "pname_816",
"description": "pdesc_871_871_871_87",
"price": 1.41,
"orderDetails": [
{
"id": 9,
"quantity": 831
},
{
"id": 51,
"quantity": 701
},
{
"id": 87,
"quantity": 310
}
]
},
{
"id": 4,
"name": "pname_395",
"description": "pdesc_495_495_495_49",
"price": 26.65,
"orderDetails": [
{
"id": 85,
"quantity": 853
}
]
}]
Same fine results for /details, /invoices, and /payments.
The problem is if I send GET request for /customers, the result:
{
"timestamp": "2018-04-05T11:53:39.558+0000",
"status": 500,
"error": "Internal Server Error",
"message": "Could not write JSON: could not extract ResultSet; nested exception is com.fasterxml.jackson.databind.JsonMappingException: could not extract ResultSet (through reference chain: java.util.ArrayList[0]->com.example.project.pojo.Customer[\"orders\"])",
"path": "/customers"
}
And if i send request for /orders, the result is:
{
"timestamp": "2018-04-05T11:54:37.316+0000",
"status": 500,
"error": "Internal Server Error",
"message": "could not extract ResultSet; SQL [n/a]; nested exception is org.hibernate.exception.SQLGrammarException: could not extract ResultSet",
"path": "/orders"
}
The same approach is not working for all. I cannot understand where the problem is. Please help me to find it.
Thanks for the answer
I have finally found the answer by myself. Here the problem is not with Annotation or key referencing but with the naming the Entities.
Since order is reserved keyword for MySql, naming the entity and variables like this causes unexpected problems.
So I have just changed the Entity name to Orders in schema and code and working fine.
Hope this post will help for others too
I have webservice which saves an order in a mysql datbase with Hibernate:
this is my json Input:
{
"consignments": [
{
"entries": [
{
"entryNumber": 0,
"productId": "0563 5231",
"quantity": 1,
"totalPrice": 125.00,
"unit": "pieces"
},
{
"entryNumber": 1,
"productId": "0563 4800",
"quantity": 1,
"totalPrice": 125.00,
"unit": "pieces"
}
],
"price": 125.00
}
],
"currency": "EUR",
"erpCustomerId": "0001709147",
"erpUnitId": "string",
"hybrisOrderId": "1512986259483",
"orderDate": "2017-12-08T15:52:25.560Z",
"paymentType": "string",
"price": {
"deliveryCosts": 1,
"totalCosts": 125.00
},
"shopId": "DE-Site",
"shopID": "DE-Site"
}
This is the order object in java:
private static final long serialVersionUID = 1L;
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
#Column(name = "hybris_order_id")
private String hybrisOrderId;
#Column(name = "erp_unit_id")
private String erpUnitId;
#Column(name = "erp_customer_id")
private String erpCustomerId;
#Column(name = "shop_id")
private String shopId;
#Column(name = "payment_type")
private String paymentType;
#Column(name = "currency")
private String currency;
#Column(name = "order_date")
private ZonedDateTime orderDate;
#OneToOne(cascade = {CascadeType.ALL})
#JoinColumn(unique = true)
private Price price;
#OneToMany(mappedBy = "placedOrder", cascade = {CascadeType.ALL}, fetch = FetchType.EAGER)
#Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)
private Set<Consignment> consignments = new HashSet<>();
#Column(name = "erp_order_id")
private String erpOrderId;
#Column(name = "erp_accepted_date")
private ZonedDateTime erpAcceptedDate;
This is the consignment java object:
private static final long serialVersionUID = 1L;
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
#Column(name = "hybris_consignment_id")
private String hybrisConsignmentId;
#Column(name = "price")
private Double price;
#JsonIgnore
#ManyToOne(cascade = CascadeType.ALL)
#JoinColumn(name="id",referencedColumnName="id", insertable=false, updatable=false)
private PlacedOrder placedOrder;
#OneToMany(mappedBy = "consignment", cascade = {CascadeType.ALL}, fetch = FetchType.EAGER)
#Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)
private Set<Entry> entries = new HashSet<>();
This is the entry java object:
private static final long serialVersionUID = 1L;
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
#Column(name = "entry_number")
private Integer entryNumber;
#Column(name = "quantity")
private Integer quantity;
#Column(name = "product_id")
private String productId;
#Column(name = "unit")
private String unit;
#Column(name = "total_price")
private Double totalPrice;
#JsonIgnore
#ManyToOne(cascade = CascadeType.ALL, fetch = FetchType.EAGER)
#JoinColumn(name="id",referencedColumnName="id", insertable=false, updatable=false)
private Consignment consignment;
My Problem is that when I try to get this order I added from the API, it works fine. But it misses one of the entries in the consignment list. When I try to access the entry table, i get this Exception:
Resolved exception caused by Handler execution: org.springframework.orm.jpa.JpaObjectRetrievalFailureException:
Unable to find com.testo.es.cloud.os.domain.Consignment with id 2;
Does anyone have an idea, why the second entry is referenced to a consignment, which doesn't exist?
Best regards