I am querying a database using jpql and my query is getting generated dynamically, i.e, both projections and predicates. However, I am not able to map the result set to get proper JSON response.
Entitlement Entity
#Entity
public class Entitlement{
#Id
#GenetedValue(strategy = GenerationType.AUTO)
private Integer id;
#Column(name = "license_id")
private String licenseId;
#Column(name = "customer_id")
private String customerId;
#OneToOne
#JoinColumn(name="product_uuid")
private Product product;
//setter getters and constructors
}
Product Entity
#Entity
public class Product{
#Id
#GenetedValue(strategy = GenerationType.AUTO)
#Column(name="product_uuid")
private Integer id;
#Column(name = "isbn")
private String isbn;
#Column(name = "title")
private String name;
//setter getters and constructors
}
EntitlementDaoImpl.java
Query query = entityManager.createQuery("select e.customerId,e.licenseId,p from Entitlement
e,Product p where e.product_uuid = p.product_uuid");
List<Entitlement> list = query.getResultList();
return list;
JSON response Received:
[
"customer101",
"license123",
"product": {
"id":201
"isbn":"abvhgfdWDMNB"
"name":"sample_book"
}
]
Expected JSON:
[
"customerId":"customer101",
"licenseId":"license123",
"product": {
"id":201
"isbn":"abvhgfdWDMNB"
"name":"sample_book"
}
]
Related
I have been working with MapStruct some days now and haven't yet achieved what i need.
As part of the exercises with Spring, I am writing a small app that will display information about the movies (title, description, director, etc.) and additionally the movie category.
Therefore, I created an additional Entity called Category, so that (e.g. an admin) could add or remove individual category names.
Movie Entity:
public class Movie {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
private String title;
private String content;
private String director;
private int year;
#ManyToMany
#Column(nullable = false)
private List<Category> category;
private LocalDate createdAt;
}
Category Entity
public class Category {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
private String categoryName;
private LocalDate createdAt;
}
I packed it all into MapStruct and DTOs.
MovieDTORequest.java
public class MovieDTORequest {
private String title;
private String content;
private String director;
private List<Category> category;
private int year;
}
MovieDTOResponse.java
public class MovieDTOResponse {
private String title;
private String content;
private String director;
private String categoryName;
private int year;
private LocalDate createdAt;
}
And MovieMapper.java
#Mapper(componentModel = "spring")
public interface MovieMapper {
#Mapping(target = "categoryName", source = "category")
MovieDTOResponse movieToMovieDTO(Movie movie);
#Mapping(target = "id", source = "title")
#Mapping(target = "createdAt", constant = "")
Movie movieRequestToMovie(MovieDTORequest request);
#Mapping(target = "id", source = "title")
#Mapping(target = "createdAt", constant = "")
void updateMovie(MovieDTORequest request, #MappingTarget Movie target);
String map(List<Category> value);
}
However, I have a problem with Mapper. First, I got the error:
"Can't map property "List<Category> category" to "String categoryName". Consider to declare/implement a mapping method: "String map(List<Category> value)"
and when I wrote it in Mapper, I have one more error:
Can't generate mapping method from iterable type from java stdlib to non-iterable type.
I am asking for help, because I am already lost.
You should define default implementation for String map(List<Category> value) inside MovieMapper interface, what would Mapstruct use to map property List<Category> category to String categoryName. For example:
#Mapper(componentModel = "spring")
public interface MovieMapper {
#Mapping(target = "categoryName", source = "category")
MovieDTOResponse movieToMovieDTO(Movie movie);
default String map(List<Category> value){
//TODO: Implement your own logic that determines categoryName
return "Movie Categories";
}
}
i had scheme of user parking and detail parking.
user can park many times (one to many)
im trying to add detail parking object to my db, but i dont have idea how to add the fk from the user in the row of the table, its gave me null there.
(ignore from the logic of the model, i just want to understood the logic how can i the object with fk of ther entity)
this is my code:
#PostMapping("/parking")
public String saveCarParking(#ModelAttribute("user") parkingUsers parkingUsers) {
// parkingUsers[id, firstName, lastName, license]
parkingUsers p = new parkingUsers("jhon", "nash", "248651355");
parkingUsersService.saveParkingUser(p);
// parkingDetails[id, entryDate, entryTime, exitDate, exitTime, user_id(FK)]
parkingDetails d = new parkingDetails(LocalDate.now(), null, LocalDate.now(), null);
parkingDetailsService.saveParkingUser(d);
//how i connect parkingDetails object with fk of parkingUsers?
//it adding now row of parkingDetails but without the fk of user
return "redirect:/parkingList";
}
parking user entity:
#Entity
#Table(name ="users")
public class parkingUsers {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "id")
private int id;
#Column(name = "first_name")
private String firstName;
#Column(name = "last_name")
private String lastName;
#Column(name = "license")
private String license;
#OneToMany(mappedBy = "parkingUsers", cascade = CascadeType.ALL, orphanRemoval = true)
private List<parkingDetails> parkingDetails = new ArrayList<parkingDetails>();
public parkingUsers() {
}
public parkingUsers(String firstName, String lastName, String license) {
this.firstName = firstName;
this.lastName = lastName;
this.license = license;
}
//setter gettrs and tostring...
entity class of details parking
#Entity
#Table(name ="details")
public class parkingDetails {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "id")
private int id;
#Column(name = "entry_date")
private LocalDate entryDate;
#Column(name = "entry_time")
private LocalDateTime entryTime;
#Column(name = "exit_date")
private LocalDate exitDate;
#Column(name = "exit_time")
private LocalDateTime exitTime;
#ManyToOne
#JoinColumn(name="user_id")
private parkingUsers parkingUsers;
public parkingDetails() {}
public parkingDetails(LocalDate entryDate, LocalDateTime entryTime, LocalDate exitDate, LocalDateTime exitTime) {
this.entryDate = entryDate;
this.entryTime = entryTime;
this.exitDate = exitDate;
this.exitTime = exitTime;
}
//test
// public parkingDetails(LocalDate entryDate, LocalDateTime entryTime, LocalDate exitDate, LocalDateTime exitTime, int user_id ) {
// this.entryDate = entryDate;
// this.entryTime = entryTime;
// this.exitDate = exitDate;
// this.exitTime = exitTime;
// this.parkingUsers.setId(user_id);
// }
//setter gettrs and tostring...
In the ParkingDetails entity, you can have a setter for "parkingUsers" variable to set user object.
In your REST api's saveCarParking() method, before calling "parkingDetailsService.saveParkingUser(d);" you can pass the user object to ParkingDetails using setter created in ParkingDetails.
This should work. No need to explicitly extract the user_id from user's object to pass into ParkingDetails.
Adding one more parameter of type ‘parkingUsers‘ in the constructor of ‘ ParkingDetails’ to initialize user in parking class will also work.
(Apart, it is a good practice to start the class name with a capital letter e.g. instead of having class name as parkingDetails, it should be ParkingDetails.)
I can not save Data. When I saved post request got error?
#Entity
#Table(name = "ALKP")
public class ALKP {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
private String title;
#Column(name = "KEYWORD")
private String keyword;
private String code;
private Long slNo;
private String fullName;
private boolean isActive;
#CreationTimestamp
#Column(name = "created_at",updatable = false)
private LocalDate createDate;
#UpdateTimestamp
#Column(name = "updated_at")
private LocalDateTime updateDateTime;
#ManyToOne
#JoinColumn(name="parentId")
public ALKP parentId;
#OneToMany(mappedBy="parentId")
public Set<ALKP> subALKP = new HashSet<>();
Data ::
PostMan Body Request Data
{
"title": "FeMale",
"keyword": "GENDER_FEMALE",
"slNo": 2,
"active": true,
"code": "MC-00209",
"fullName": "FEMALE",
"parentId":700
}
"message": "detached entity passed to persist error in Spring Boot when consuming a rest service",
When I saved data it can not be catch Parent ALKP . I think It can be
parentId:{
"id":700
}
seems your ALKP enity have same parentId. or your defined the association mab be wrong.
#ManyToOne
#JoinColumn(name="parentId")
public ALKP parentId;
#OneToMany(mappedBy="parentId")
public Set<ALKP> subALKP = new HashSet<>();
Above both are pointng same ALKP and its Id then how can you get one and many object in same enity?
I'm using Spring to develop APIs along with JPA. I'm handling a POST request that accepts #RequestBody as a JSON object that looks like this-
{
"id": "323",
"name": "Sam",
"gpsLocation": {
"latitude": 66.7492558,
"longitude": 97.133258
}
}
And an SQL User Table that has the following columns-
id | name | latitude | longitude
Is there a way in Spring to map this nested json object directly to these table columns?
This is what my User.java and GpsLocation.java entity classes look like right now-
#Table(name = "user")
#Entity
public class UnderObservation {
#Column(name = "name", nullable = false)
private String name;
#Id
#Column(name = "id", nullable = false)
private String userID;
private GpsLocation location;
}
#Entity
public class GpsLocation {
#Column(name = "Latitude", nullable = false)
private Double Latitude;
#Column(name = "Longitude", nullable = false)
private Double Longitude;
}
I'm looking for a way to "flatten/unwrap" GpsLocation class so that it directly fits into the User table instead of having a separate table for GpsLocation.
I can not change the JSON Structure because some other No SQL Databases are using this. Also, I'm new to Spring!
The best practice here is using DTO data transfer object that hold the request body
and map it to the user object using external library like mapstruct, ObjectMapper or even do it manually
the DTO is a pojo Object carries data between processes
Try This way with a Constructor:
#Getter
#Setter
#Table(name = "user")
#Entity
public class UnderObservation {
#Column(name = "name", nullable = false)
private String name;
#Id
#Column(name = "id", nullable = false)
private String userID;
#Column(name = "latitude", nullable = false)
private Double latitude;
#Column(name = "longitude", nullable = false)
private Double longitude;
private GpsLocation location;
UnderObservation(String name, String userID, GpsLocation location) {
this.name = name;
this.userID = userID;
this.location = location;
this.latitude = this.location.getLatitude();
this.longitude = this.location.getLongitude();
}
}
I have question about creating native query with custom response (spring projection) with nested „custom“ sublist i.e. i am trying to generate JSON output with nested sublists.
Child entity is:
#Entity
public class Child {
#Id
#GeneratedValue(strategy=GenerationType.AUTO)
private int id;
#NotNull
#Column(nullable = false)
private String firstName;
#NotNull
#Column(nullable = false)
private String secondName;
#Enumerated(EnumType.STRING)
private Gender gender;
private Date dateOfBirth;
private String phone;
#ManyToOne
#JoinColumn(name="child_id")
private List<Parent> parents = new ArrayList<Parent>();
//...
}
Parent entity is, for example:
#Entity
public class Parent {
#Id
#GeneratedValue(strategy=GenerationType.AUTO)
private int id;
#NotNull
#Column(nullable = false)
private String firstName;
#NotNull
#Column(nullable = false)
private String secondName;
private Date dateOfRegistration;
#OneToMany(fetch = FetchType.LAZY)
private List<Child> child = new ArrayList<Child>();
//...
}
Projection interface:
public interface ChildProjectionInterface {
public int getParentId();
public Date getFirstName();
public List<ChildResponse> getChildData();
interface ChildResponse {
public int getChildID();
public String getFirstName();
}
}
Query (but, obviously, doesn't working):
#Query(value = "SELECT p.id AS parentId, p.firstName AS firstName, c.id AS childData.childId, c.firstName AS childData.firstName FROM parent p LEFT JOIN child c ON p.child_id = c.child_id AND p.secondName = :secondName", nativeQuery = true)
List<ChildProjectionInterface> getListWithSubList(#Param(value ="secondName") String secondName);
I was reading and researching and trying..but nothing works (I saw https://medium.com/swlh/spring-data-jpa-projection-support-for-native-queries-a13cd88ec166, saw "for json auto" clause but not for spring jpa, etc.)
Did you try jpa fetch operator?
#Query("select p from parent p left join fetch p.child c where p.secondName = :secondName")