How can I make a many-to-one xml mapping from the stayId of RoomOccupancy to the stayId of Stay. Note that StayId is a value object, therefore it does not contain the whole reference to Stay.
public class RoomOccupancy {
// generated hibernate id
private Long id;
private LocalDate startDate;
private LocalDate endDate;
private StayId stayId;
}
public class Stay {
// generated hibernate id
private Long id;
private StayId stayId;
}
I would be very glad, if someone could help me out.Thank you in Advance!
If I understood you, then you need make it like this:
public class RoomOccupancy {
private Long id;
private LocalDate startDate;
private LocalDate endDate;
#ManyToOne(fetch = FetchType.EAGER, targetEntity = Stay .class)
#JoinColumn(name = "stayId")
private Stay stay;
}
public class Stay {
private Long id;
}
Or if you need as xml, just add next code to your xml file
<many-to-one name = "stay" column = "stayId" class="Stay " not-null="true"/>
Related
I have to entities modeled Session and Speaker, with ManyToMany relationship, and I wanted to delete an instance of Session, but in the DB it is the foreign key of another table. Below is the entity model
#Entity(name = "sessions")
public class Session {
// attributes do not respect camel case notations because they
// need to match table notations in order to auto bind without annotations
// otherwise that is done with #Column annotation
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long session_id;
private String session_name;
private String session_description;
private String session_length;
#OnDelete(action = OnDeleteAction.CASCADE)
#ManyToMany()
#JoinTable(
name = "session_speakers",
joinColumns = #JoinColumn(name = "session_id"),
inverseJoinColumns = #JoinColumn(name = "speaker_id")
)
private List<Speaker> speakers;
public Session() {
}
I tried to use OnDelete Cascade, but it still didn't work. (I did read that it is not advised to use on ManyToMany relationship)
#RequestMapping(value = "{id}", method = RequestMethod.DELETE)
public void delete(#PathVariable Long id){
sessionRepo.deleteById(id);
}
EDIT:
here is also the Speaker entity
#Entity(name = "speakers")
public class Speaker {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long speaker_id;
private String first_name;
private String last_name;
private String title;
private String company;
private String speaker_bio;
#Lob
#Type(type = "org.hibernate.type.BinaryType")
private Byte[] speaker_photo;
public Byte[] getSpeaker_photo() {
return speaker_photo;
}
public void setSpeaker_photo(Byte[] speaker_photo) {
this.speaker_photo = speaker_photo;
}
#ManyToMany(mappedBy = "speakers")
#JsonIgnore// added to resolve serialization issues
private List<Session> sessions;
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 have the following Spring boot service for an object of type Report -
#Service
public class ReportService {
#Autowired
private ReportRepository reportRepository;
#Autowired
private UserRepository userRepository;
/*get all reports */
public List<Report> getAllReports(){
return reportRepository.findAll();
}
/*get a single report */
public Report getReport(Long id){
return reportRepository.getOne(id);
}
//other similar methods....
}
The problem arises while retrieving a single Report. If a report ID is send which doesn't exist, the following error is generated...
DefaultHandlerExceptionResolver : Failed to write HTTP message:
org.springframework.http.converter.HttpMessageNotWritableException: Could not
write JSON: Unable to find com.interact.restapis.model.Report with id 16;
nested exception is com.fasterxml.jackson.databind.JsonMappingException:
Unable to find com.interact.restapis.model.Report with id 16 (through
reference chain:
com.interact.restapis.model.Report_$$_jvst83c_1["fromUserId"])
Below is the code for my Report Controller
#RestController
public class ReportController {
#Autowired
private ReportService reportService;
//Get all reports
#GetMapping("/interactions")
public List<Report> getAllReports() {
return reportService.getAllReports();
}
//Get single report
#GetMapping("/interactions/{id}")
public ResponseEntity<Report> getReport(#PathVariable Long id) {
if(reportService.getReport(id) == null)
return new ResponseEntity<>(HttpStatus.NOT_FOUND);
return new ResponseEntity<>(reportService.getReport(id), HttpStatus.OK);
}
#PostMapping("/interactions")
public ResponseEntity<Report> addReport(#RequestBody Report report) {
Report report1 = reportService.addReport(report);
if(report1 == null)
return new ResponseEntity<>(report, HttpStatus.NOT_FOUND);
return new ResponseEntity<>(report1, HttpStatus.OK);
}
//Other request methods...
}
Below is the code for my Report Model class -
#Entity
#Table (name = "report")
#EntityListeners(AuditingEntityListener.class)
#JsonIgnoreProperties({"hibernateLazyInitializer", "handler"})
public class Report {
#Id
#Column (name = "id")
#GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
#Column(name = "from_user_id")
private Long fromUserId;
#Column(name = "to_user_id")
private Long toUserId;
#Column(name = "to_user_email")
private String toUserEmail;
#Column(name = "from_user_email")
private String fromUserEmail;
#Temporal(TemporalType.DATE)
#JsonFormat(pattern = "dd-MM-yyyy hh:mm:ss")
#CreatedDate
private Date createdAt;
#Column(nullable = false)
private String observation;
#Column(nullable = false)
private String context;
private String recommendation;
#Column(nullable = false)
private String eventName;
#Temporal(TemporalType.DATE)
#JsonFormat(pattern = "dd-MM-yyyy hh:mm:ss")
#Column(nullable = false)
private Date eventDate;
private boolean isAnonymous;
#Temporal(TemporalType.DATE)
#JsonFormat(pattern = "dd-MM-yyyy hh:mm:ss")
private Date acknowledgementDate;
#OneToMany(cascade = CascadeType.ALL, targetEntity = Action.class)
#JoinColumn(name = "report_id")
private List<Action> actionList;
#Value("${some.key:0}")
private int rating; //Range 0 to 4
private int type;
/*
Getter and setter methods...
*/
}
I want to know if reportRepository.getOne(Long id) returns null so that I can actually check if a particular report doesn't exist in the database. If not, how else can I implement the above?
The JpaRepository.getOne with throw EntityNotFoundException if it couldn't find a record with the given id.
You can use CrudRepository.findById (JpaRepository is a subclass of CrudRepository) which will return an Optional<Report> which can be empty if there are no record for the given id. You can use Optional.isPresent() to check whether it a Report is available or not and take actions accordingly.
Create a method in your ReportRepository.
It will return Report by matched id else return null.
public Optional<Report> findById(Long id);
Note: findById(Long id); should match with the property name in your Report entity.
I am assuming your Report entity is as follows:
public class Entity{
private Long id;
...
}
I'm having trouble understanding how the #RelationshipEntity works. I've tried following examples, but even though I think I'm following the same pattern as the example, I end up witha stackoverflow, because the Relationship Entity grabs the NodeEntity, which has the RelationshipEntity, and on and on...
My model is:
(:Vendor)-[:BELONGS_TO {active: true, sinceDate: date}]->(:Store)
So my two nodes are Vendor and Store:
#NodeEntity
#Data
public class Vendor {
#GraphId
private Long id;
private Long vendorId;
private String name;
private String address;
#Relationship(type = "OWNS")
private Collection<Inventory> inventory;
#Relationship(type = "BELONGS_TO")
private Collection<Store> store;
}
#NodeEntity
#Data
public class Store {
#GraphId
private Long id;
private Long storeId;
private String name;
private String address;
private String email;
#Relationship(type = "BELONGS_TO", direction = Relationship.INCOMING)
private List<StoreParticipant> storeParticipant;
}
And my RelationshipEntity:
#RelationshipEntity(type = "BELONGS_TO")
#Data
public class StoreParticipant {
#GraphId
private Long id;
#StartNode
private Vendor vendor;
#EndNode
private Store store;
private int count;
private double price;
private boolean negotiable;
private boolean active;
}
I based this off of the Movie example which had (:Person)-[:ACTED_IN]->(:MOVIE) and the acted_in relationship was ROLE
This is happening when I call the repository method findByVendorId
#Repository
public interface VendorRepository extends GraphRepository<Vendor> {
List<Vendor> findByVendorId(Long vendorId);
}
If you're referencing this from both ends, you need to reference the relationship entity, not the node entity directly.
Store looks fine but Vendor contains
#Relationship(type = "BELONGS_TO")
private Collection<Store> store;
when it should be
#Relationship(type = "BELONGS_TO")
private Collection<StoreParticipant> store;
im new to Spring and hibernate, i got the error above when trying to persist the transaction data. please try to help this problem
Here's my Entity:
#Entity #NamedQuery(name="Employee.findAll", query="SELECT e FROM Employee e")
public class Employee implements Serializable{
private static final long serialVersionUID = 1L;
#Id
#GeneratedValue(strategy=GenerationType.IDENTITY)
private int id;
private String city;
private String civil;
#Temporal(TemporalType.DATE)
#Column(name="dob", length=11)
private Date dob;
private String email;
private int epf;
private String fname;
private String gender;
private int landtp;
private String lname;
#Temporal(TemporalType.DATE)
#Column(name="salaryincrement", length=11)
//bi-directional many-to-one association to Designation
#ManyToOne(fetch = FetchType.LAZY)
#JoinColumn(name="designation_id", nullable=false)
private Designation designation;
public Employee() { }
#Entity
#NamedQuery(name="Designation.findAll", query="SELECT d FROM Designation d")
public class Designation implements Serializable{
private static final long serialVersionUID = 1L;
#Id
#GeneratedValue(strategy=GenerationType.IDENTITY)
private int id;
private String type;
//bi-directional many-to-one association to Employee
#OneToMany(mappedBy="designation")//, cascade=CascadeType.ALL
private List<Employee> employees;
public Designation() {
}
this is my Entity class,
Entities have a getters ans setters
designation is set nullable = false. However employees variable isn't initialized in Designation. So, you'll have to initialize as
#OneToMany(mappedBy="designation")//, cascade=CascadeType.ALL
private List<Employee> employees = new LinkedList<>();
I'm not sure that you can go with primitive type int as your Id - you should probably use Integer - because int has default zero value and cannot be null, your new record can be rather seen as a detached entity with Id ZERO and not as a transient one.
The same mistake is in Designation class.
See Primitive or wrapper for hibernate primary keys