*#Entity
#Table(name = "model_data")
public class ModelData {
#Id
#Column(name = "id")
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
#ManyToOne
#JoinColumn(name = "diagram_id")
private DiagramEntity diagram;
//Getter Setter
}
#Entity
#Table(name = "diagram")
public class DiagramEntity {
#Id
#Column(name = "id")
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
#JsonProperty(value = "class")
private String aciklama;
#OneToMany(mappedBy = "diagram")
private Set<ModelData> modelData;
//Getter Setter
}*
DiagramEntity has manytoone relation with modeldata entity. Then I post
*{
"modelData": [
{
"diagram": null,
}
],
}*
via postman, DiagramEntity id is automatically updated but I cannot assign id to modelData entity and cannot save to database. what should I do?
I find solution for my problem. I streamed every object and mapped to my entities in the my controller class.
public DiagramEntityDto saveOrUpdate(#RequestBody DiagramEntityDto dto) {
try {
dto.getModelData().stream().map(a ->
this.modelDataService.saveOrUpdate(a)).collect(Collectors.toSet());
return this.diagramService.saveOrUpdate(dto);
} catch (Exception e) {
System.out.println(e.getMessage());
}
return null;
}
Related
I'm working on an exercise where i have to create CRUD operations.
I have a User table, a Role table and a UserRole table where i have the primary keys of those two entities.
I also have a RoleEnum with roles that have to be assigned to the User.
The problem that i'm gettin is that every time I insert a new user is a 200ok response but the role returns null and so it doesn't add it to the UserRole table as well.
I need help in solving the problem.
User Entity
#Data
#Entity
#NoArgsConstructor
#AllArgsConstructor
#Table(name = "utente")
public class Utente implements Serializable {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private long matricola;
#Column(nullable = false)
private String nome;
#Column(nullable = false)
private String cognome;
#Column(nullable = false)
private String email;
#Column(name = "ruoloUtente", nullable = false)
#OneToMany(mappedBy = "matricolaUtente")
#JsonIgnore
private List<UtenteRuolo> ruoloUtente;
}
Role Entity
#Data
#Entity
#NoArgsConstructor
#AllArgsConstructor
#Table(name = "ruolo")
public class Ruolo implements Serializable {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private long id;
#Column(name = "tipo_ruolo")
private String nome;
#Column(name = "utente_ruolo")
#OneToMany(mappedBy = "nomeRuolo")
private Set<UtenteRuolo> utenteRuolo;
}
UserRole class
#Data
#NoArgsConstructor
#AllArgsConstructor
#Entity
#Table(name = "utente_ruolo")
public class UtenteRuolo implements Serializable {
#EmbeddedId
private UtenteRuoloId utenteRuoloId;
#ManyToOne
#MapsId("matricola")
#JoinColumn(name = "matricola_utente", nullable = false)
private Utente matricolaUtente;
#ManyToOne
#MapsId("id")
#JoinColumn(name = "nome_ruolo", nullable = false)
private Ruolo nomeRuolo;
}
UserRoleId class
#Embeddable
#Data
#EqualsAndHashCode
#AllArgsConstructor
#NoArgsConstructor
public class UtenteRuoloId implements Serializable {
#Column(name = "matricola")
private Long matricola;
#Column(name = "id")
private Long id;
}
RoleEnum class
public enum RuoliEnum {
#JsonProperty
REFERENTE("REFERENTE"),
CONSULTATORE("CONSULTATORE"),
APPROVATORE("APPROVATORE");
#JsonProperty
private String value;
RuoliEnum(String value) { this.value = value; }
#JsonCreator
public static RuoliEnum fromValue(String text) {
for (RuoliEnum ruoli: RuoliEnum.values()) {
if (String.valueOf(ruoli.value).equalsIgnoreCase(text.trim())) {
return ruoli;
}
}
return null;
}
}
I also have all DTO's and the UserDTO has the RoleEnum instead of the List of class UserRole.
UserService
#Service
public class UtenteService {
#Autowired
private UtenteRepository utenteRepository;
#Autowired
private UtenteMap utenteMap;
public UtenteDto addUtente(UtenteDto utente) {
Utente u = utenteMap.fromDtoToModel(utente);
if(u != null) {
return utenteMap.fromModelToDto(utenteRepository.save(u));
}
return null;
}
UserController
#RestController
#RequestMapping("utente")
public class UtenteController {
#Autowired
private UtenteService utenteService;
#PostMapping("/addUtente")
public ResponseEntity addUtente(#Nullable #RequestBody UtenteDto utente) {
if(utente != null) {
return ResponseEntity.ok(utenteService.addUtente(utente));
} else {
return ResponseEntity.badRequest().body("utente non inserito correttamente");
}
}
this is a postman insert example:
{
"matricola" : 11,
"nome" : "aaa",
"cognome" : "bb",
"email" : "eee#mail.com",
"ruolo" : "APPROVATORE"
}
and this is the postman response with 200ok status:
{
"matricola": 11,
"nome": "aaa",
"cognome": "bb",
"email": "eee#mail.com",
"ruolo": null
}
the code doesn't tell me about any kind of error and i need to keep the UserRole table because it's required for this kind of exercise.
I tried everything I could but since I never worked like this with enums and this kind of table relations I don't know what's missing to complete it.
I have two simple classes Student and Course. I am trying to set up many to many relationship between these classes. I want to use additional table whose PRIMARY KEY is the combination of the primary keys of student and course tables (student_id and course_id).
The student class:
#Entity
#Table(name = "student")
#Getter
#Setter
#AllArgsConstructor
#NoArgsConstructor
public class Student {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
#Column(name = "name")
private String name;
#Column(name = "surname")
private String surname;
#OneToMany(mappedBy = "student")
private Set<CourseStudent> courses;
}
The course class:
#Entity
#Table(name = "course")
public class Course {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
private String courseName;
#OneToMany(mappedBy = "course")
Set<CourseStudent> students;
}
The entity that stores the relationship between course and the student:
#Entity
#NoArgsConstructor
#Data
public class CourseStudent {
#EmbeddedId
CourseStudentKey id;
#ManyToOne
#MapsId("studentId")
#JoinColumn(name = "student_id")
Student student;
#ManyToOne
#MapsId("courseId")
#JoinColumn(name = "course_id")
Course course;
public CourseStudent(Student student, Course course) {
this.student = student;
this.course = course;
this.rating = 0;
}
int rating;
}
Attention: Since I want to have additional features in this entity (for example, storing the rating of the students for courses), I don't want to use #JoinTable idea that we implement in the Student class.
Since I have multiple attributes in the primary key of CourseStudent entity, I used the following class
#Embeddable
#Data
public class CourseStudentKey implements Serializable {
#Column(name = "student_id")
Long studentId;
#Column(name = "course_id")
Long courseId;
}
I have the following POST request to insert the student into a course:
#PostMapping("/insert/students/{studentId}/courses/{courseId}")
public CourseStudent insertStudentIntoCourse(#PathVariable(value = "studentId") Long studentId,
#PathVariable(value = "courseId") Long courseId) {
if (!studentRepository.existsById(studentId)) {
throw new ResourceNotFoundException("Student id " + studentId + " not found");
}
if (!courseRepository.existsById(courseId)) {
throw new ResourceNotFoundException("Course id " + courseId + " not found");
}
CourseStudent courseStudent = new CourseStudent(
studentRepository.findById(studentId).get(),
courseRepository.findById(courseId).get()
);
return courseStudentRepository.save(courseStudent);
}
I have manually added Student and the Course into my local database and send this request by using Postman.
http://localhost:8080/insert/students/1/courses/1
However, I get the following error:
{
"timestamp": "2022-08-04T12:33:18.547+00:00",
"status": 500,
"error": "Internal Server Error",
"path": "/insert/students/1/courses/1"
}
In the console, I get NullPointerException. What is the thing I am doing wrong here?
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 have created two Entities namely Teacher and Detail, the code snippet is shown below
Teacher.java
#Entity
#Table(name = "teacher")
public class Teacher implements Serializable {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "id")
private long id;
#Column(name = "name")
private String name;
#Column(name = "age")
private int age;
#OneToOne(mappedBy = "teacher", cascade = CascadeType.ALL)
private Detail detail;
public Teacher() {
}
public Teacher(String name, int age) {
this.name = name;
this.age = age;
}
//getter and setter
}
Detail.java
#Entity
#Table(name = "detail")
public class Detail implements Serializable {
#Id
#OneToOne(cascade = CascadeType.ALL)
#JoinColumn(name = "id")
private Teacher teacher;
#Column(name = "subjects")
private String subjects;
public Detail() {
}
public Detail(String subjects) {
this.subjects = subjects;
}
//getter and setter
}
I am trying to achieve one to one mapping with the shared primary key concept
but when i execute the controller, only Teacher table is updating with the value
try {
Teacher teacher=new Teacher("xyz",23);
Detail detail=new Detail("Java,c,c++");
teacher.setDetail(detail);
session.beginTransaction();
session.save(teacher);
session.getTransaction().commit();
model.addAttribute("added", "data inserted");
session.close();
}
After executing only Teacher table is updated with the specified values.Detail table is still showing empty
It does not work exactly like that. You still need the id field in your Detail, so add:
#Id
private long id;
to your Deatail class.
And - as comment suggests - replace the #Id annotation in field Teacher to #MapsId. This way the id of Teacher is mapped to the id of Detail BUT ONLY if you also set the teacher to the detail - you always need to set both sides of relationship - like:
teacher.setDetail(detail);
detail.setTeacher(teacher);
I have mapped a table to my table and trying to add some values in it. but I am getting errors as below
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException:
You have an error in your SQL syntax; check the manual that
corresponds to your MySQL server version for the right syntax to use
near 'create, delete, read, role_id, update, id) values
(_binary'ØN_WlAs—\niÊnÙ' at line 1
my entities are
RoleSettings.java
#Entity #Table(name = "role_settings")
#Getter #Setter #Data
public class RoleSettings implements Serializable {
private static final long serialVersionUID = 8862104773442047690L;
#Id
#GeneratedValue(generator = "uuid2")
#GenericGenerator(name = "uuid2", strategy = "org.hibernate.id.UUIDGenerator")
private UUID id;
#ManyToOne
#JoinColumn(name = "role_id", referencedColumnName = "id", foreignKey = #ForeignKey(name = "role_settings_iam_role_FK"))
private RoleMaster roleId;
}
RoleMaster.java
#Entity #Table(name = "role")
#Getter #Setter #Data
public class RoleMaster implements Serializable {
private static final long serialVersionUID = 1792968151371176640L;
#Id
#GeneratedValue(generator = "uuid2")
#GenericGenerator(name = "uuid2", strategy = "org.hibernate.id.UUIDGenerator")
private UUID id;
#Column(name = "name", nullable = false, length = 255)
private String name;
}
RoleSettingsRepository.java
public interface RoleSettingsRepository extends JpaRepository<RoleSettings, UUID>{}
RoleSettingsService.java
#Service
Class RoleSettingsService {
#Autowired
private RoleSettingsRepository roleSettingsRepository;
public BaseDTO create(RoleSettings roleSettings) {
BaseDTO response = new BaseDTO();
RoleSettings newRoleSettings = new RoleSettings();
try {
newRoleSettings.setRoleId(roleSettings.getRoleId());
newRoleSettings.setAppAccessId(roleSettings.getAppAccessId());
newRoleSettings.setCreate(roleSettings.getCreate());
newRoleSettings.setUpdate(roleSettings.getUpdate());
newRoleSettings.setRead(roleSettings.getRead());
newRoleSettings.setDelete(roleSettings.getDelete());
roleSettingsRepository.save(newRoleSettings);
response.setStatusCode(200);
} catch (Exception e) {
}
return response;
}
}
RoleSettingsController.java
#RestController
#RequestMapping("/v1/rolesettings")
public class RoleSettingsController {
#Autowired
private RoleSettingsService roleSettingsService;
#PostMapping("/post")
public BaseDTO create(#RequestBody RoleSettings roleSettings) {
BaseDTO response = roleSettingsService.create(roleSettings);
return response;
}
}
my json object
{ "roleId" :{"id": "b2e64c82-ab75-41d3-bb10-e9150f314807"} }
and my roleId is stored in database as type binary(16).
Check in your database data type of the id column. It has to be BINARY(16). And annotate your entity field as:
#Id
#GeneratedValue(generator = "uuid2")
#GenericGenerator(name = "uuid2", strategy = "org.hibernate.id.UUIDGenerator")
#Column(columnDefinition = "BINARY(16)")
private UUID id;
Note that you nned to add a column definition in this case.