I'm getting Flux<Employee> from database and I want to convert the same into Mono<EmployeeRespnose> which will contain list of Employees.
public Mono<EmployeeResponse> getEmployeeResponse(){
Flux<Employee> employeeFlux = repository
.findEmployees();
return //How to begin here??;
}
I don't know how to begin with this. (Operation should be non-blocking)
Please provide any hint/suggestion that how I can begin with this?
//class Employee
class Employee{
private Long ID;
private String name;
private String address;
//getters and setters
}
//EmployeeResponse class
class EmployeeResponse{
private int count;
private List<Employee> list;
//getters and setters
}
I used employeeFlux.collectList() to get the Mono<List<Employee>> and than used map() to convert List<Employee> to Mono<EmployeeResponse>
public Mono<EmployeeResponse> getEmployeeResponse(){
Flux<Employee> employeeFlux = Flux.empty() ;
return employeeFlux.collectList().map(emplist -> {
EmployeeResponse response = new EmployeeResponse();
response.setCount(emplist.size());
response.setList(emplist);
return response;
});
}
Related
Referring to the getting started link below
https://quarkus.io/guides/hibernate-orm-panache
The example uses a Entity class with public attributes.
class Person{
public String name;
}
and used as
person.name = "Synd";
so is it simply a lazy example (!! in official doc ? ) or it means something else.
According to the documentation, it might be related to a single difference (extending PanacheEntityBase)
If you don’t want to bother defining getters/setters for your entities, you can make them extend PanacheEntityBase and Quarkus will generate them for you. You can even extend PanacheEntity and take advantage of the default ID it provides.
Therefore they are making them Public for Quarkus to generate getters/setters for you automatically.
#Entity
public class Person extends PanacheEntity {
public String name;
public LocalDate birth;
public Status status;
public static Person findByName(String name){
return find("name", name).firstResult();
}
public static List<Person> findAlive(){
return list("status", Status.Alive);
}
public static void deleteStefs(){
delete("name", "Stef");
}
}
vs
#Entity
public class Person {
#Id #GeneratedValue private Long id;
private String name;
private LocalDate birth;
private Status status;
public Long getId(){
return id;
}
public void setId(Long id){
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public LocalDate getBirth() {
return birth;
}
public void setBirth(LocalDate birth) {
this.birth = birth;
}
public Status getStatus() {
return status;
}
public void setStatus(Status status) {
this.status = status;
}
}
when i updating the records via postman record not updating it will create a new record i don't know why.i attached screenshot below along with code what i tried so far.i have attched the controller,service,
entity,repository.
i am tring this since yesterday problem not solved please some one will help me to solve
enter image description here
EmployeeController
#PutMapping("/edit/{id}")
private Employee update(#RequestBody Employee employees,#PathVariable(name = "id") long id)
{
Employee emp = services.get(id);
services.saveOrUpdate(emp);
return employees;
}
Services
//updating a record
//updating a record
public void update(Employee employees, int id)
{
repo.save(employees);
}
Repository
#Repository
public interface EmployeeRepository extends CrudRepository<Employee,Long> {
}
Entity
#Entity
#Table(name="Records")
public class Employee {
#Id
#Column(name="id")
#GeneratedValue(strategy = GenerationType.IDENTITY)
private long id;
#Column(name="fname")
private String fname;
#Column(name="lname")
private String lname;
#Column(name="city")
private String city;
#Column(name="phone")
private String phone;
#Column(name="salary")
private String salary;
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public String getFname() {
return fname;
}
public void setFname(String fname) {
this.fname = fname;
}
public String getLname() {
return lname;
}
public void setLname(String lname) {
this.lname = lname;
}
public String getCity() {
return city;
}
public void setCity(String city) {
this.city = city;
}
public String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = phone;
}
public String getSalary() {
return salary;
}
public void setSalary(String salary) {
this.salary = salary;
}
}
This an example of UPDATE and it worked for me.
//HTTP PUT
#PutMapping("/owners/{id}")
public void updateOwner(#RequestBody Owner owner, #PathVariable int id) {
owner.setId(id);
ownerRepos.save(owner);
}
I used the CrudRepository too.
Also I notice that you call services.saveOrUpdate(emp) but at the same time you showed us "public void update(Employee employees, int id)" below. If'd better if you could show the definition of the method saveOrUpdate()
SaveOrUpdate uses the ID of the object to determine if the object is the same or new. When updating, you're not considering the ID of the employee. You should first fetch the Object from DB and update the same object. The updates should take place on a persistent object
I'm beginner (sorry for my bad explanation, feel free to correct me) in MyBatis Spring-Boot, I have problem to understand and make it works #Many
I'm using 3 layer logic programming (Presentation Layer, Service Layer, Data Layer)
Thanks for your help :)
I have 3 Tables (it's TB_Products and not TB_Product as on the screenshot):
I would like to get data form table TB_Users and TB_Products to "put" it in DTO
I create 4 java object class SearchEntity, ProductEntity (for Data layer)
I create an interface SearchRepositoryMapper.
I also create a SearchService interface and SearchServiceImpl as well.
Java object class:
SearchEntity
public class SearchEntity implements Serializable{
private static final long serialVersionUID = -9143930742617602050L;
private String id;
private String firstName;
private String lastName;
private List<ProductEntity> products;
// Getters and Setters code .....
}
ProductEntity
public class ProductEntity implements Serializable{
private static final long serialVersionUID = -6525703679290992635L;
private String id;
private String productId;
private String product;
private String number;
private String date;
private String description;
// Getters and Setters code .....
}
SearchRepositoryMapper
public interface SearchRepositoryMapper {
// Get some fields from TB_Users and all fields from TB_Products
#Select("SELECT * FROM TB_Users WHERE id = #{id}")
#Results({
#Result(property = "id", column ="id"),
#Result(property = "firstName", column = "firstName"),
#Result(property = "lastName", column= "lastName"),
#Result(property = "products", javaType = List.class, column="id",
many = #Many(select = "getProductIdByUserId"))})
public SearchEntity findAllInfoByUserId(#Param("id") int id);
#Select("SELECT *, productId FROM TB_Products WHERE productId = #{id}")
public ArrayList<ProductEntity> getProductIdByUserId(#Param("id") int id);
// Find id by uderId and return null if it doesn't exist
#Select("SELECT id FROM TB_Users WHERE userId = #{userId}")
int findIdByUserId(#Param("userId") String userId);
}
SearchServiceImpl
#Service
public class SearchServiceImpl implements SearchService {
#Autowired
SearchRepositoryMapper searchRepository;
#Override
public SearchDto getAllInfoByUserId(String id) {
SearchDto returnValue = new SearchDto(); // Init returnValue as SearchDto
int searchId = searchRepository.findIdByUserId(id); // Init searchId with the TB_Users id
SearchEntity searchEntity = searchRepository.findAllInfoByUserId(searchId);
BeanUtils.copyProperties(searchEntity, returnValue);
return returnValue;
}
}
So when I execute the code and do a GET request I get this error message:
{
"message": "nested exception is org.apache.ibatis.executor.ExecutorException: Statement returned more than one row, where no more than one was expected."
}
I found out that come from the mapper and SearchEntity searchEntity = searchRepository.findAllInfoByUserId(searchId);
But i don't know how to resolve it. The way I wrote the code is wrong
Thanks to correct me
The exception clearly says that the query returns multiple results. Plese verify if the data in the table is correct.
I'm having issues getting a neo4j RelationshipEntity persisted with Spring Boot. I'm using spring-boot-starter-data-neo4j (2.1.0.RELEASE), and the neo4j docker image tagged 3.4.9.
I have a simple NodeEntity, which contains a collection for the RelationshipEntity:
#NodeEntity
public class Book {
#Id
#GeneratedValue
private Long id;
private String name;
public Book() {}
public Book(String name) {
this.name = name;
}
#Relationship(type = "PURCHASED_WITH", direction = "OUTGOING")
private Set<BookPurchase> purchases = new HashSet<>();
// getters and setters follow
}
I have another NodeEntity, which also contains a collection for the relationship entity:
#NodeEntity
public class CreditCard {
#Id
#GeneratedValue
private Long id;
private String number;
#DateString(value = "yyyy-MM-dd")
private Date expiryDate;
public CreditCard() {}
public CreditCard(String number, Date expiryDate) {
this.number = number;
this.expiryDate = expiryDate;
}
#Relationship(type = "PURCHASED_WITH", direction = "INCOMING")
private Set<BookPurchase> purchases = new HashSet<BookPurchase>();
// getters and setters follow
}
I have the RelationshipEntity, which adds references to both NodeEntity classes in the constructor:
#RelationshipEntity(type = "PURCHASED_WITH")
public class BookPurchase {
#Id
#GeneratedValue
private long id;
#DateString("yyyy-MM-dd")
Date purchaseDate;
#StartNode
private Book book;
#EndNode
private CreditCard card;
public BookPurchase(){}
public BookPurchase(CreditCard card, Book book, Date purchaseDate) {
this.card = card;
this.book = book;
this.purchaseDate = purchaseDate;
this.card.getPurchases().add(this);
this.book.getPurchases().add(this);
}
// getters and setters follow
}
And finally I have the Spring controller tying everything together:
#RestController
public class ExamplesController {
#Autowired
CreditCardRepository creditCardRepository;
#PostMapping(value="/purchases")
public String createPurchases() {
CreditCard card = new CreditCard("11111", new GregorianCalendar(2018, Calendar.FEBRUARY, 12).getTime());
Book book1 = new Book("of mice and men");
BookPurchase purchase1 = new BookPurchase(card,book1,new GregorianCalendar(2018, Calendar.MARCH, 15).getTime());
creditCardRepository.save(card);
return "Successfully created entities";
}
}
Whenever I try to curl -X POST http://localhost:8080/purchases, I just see the following in the neo4j browser - the RelationshipEntity is not persisted, only the nodes.
Can anyone assist?
Thanks to Gerrit Meier for answering this one. My RelationshipEntity was using the primitive long instead of the object/wrapper Long. Complete details here: https://community.neo4j.com/t/neo4j-relationshipentity-not-persisted/3039
I need some help to map Entity to DTO using Model Mapper.
Here are my two pojos
#Data
public class ClientDTO {
private UUID id;
#NotNull
private String name;
private String description;
private String contactEmail;
}
#Data
#Entity
public class Client {
#Id
private String id;
#NotNull
private String name;
private String description;
#NotNull
private String contactEmail;
}
When am trying to convert between Client to ClientDTO id is rendered as null. I tried writing a PropertyMap and a converter but none of them is working for me.
I went through the documentation and was able to find a solution to the problem. Here is the soln.
Initialization
private PropertyMap<Client, ClientDTO> clientMap;
private ModelMapper clientToClientDtoMapper;
Defining PropertyMap and Converter
clientToClientDtoMapper = new ModelMapper();
Converter<Client, UUID> uuidConverter = new AbstractConverter<Client, UUID>() {
protected UUID convert(Client source) {
return UUID.fromString(source.getId());
}
};
clientMap = new PropertyMap<Client, ClientDTO>() {
protected void configure() {
try {
using(uuidConverter).map(source).setId(null);
} catch (Exception ex) {
System.out.println("Error.");
}
}
};
clientToClientDtoMapper.addMappings(clientMap);
Helper method to convert from Entity to DTO
private ClientDTO convertToDto(Client client) {
ClientDTO clientDTO = clientToClientDtoMapper.map(client, ClientDTO.class);
return clientDTO;
}