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;
}
}
Related
I want to display table data based on different parameters like price range as well as category.
#Entity
public class Item {
#Id
#GeneratedValue
private Long id;
private String name;
private Double price;
private String category;
public Item() {
super();
}
Item(String name, String category){
super();
this.name = name;
this.category = category;
}
public Item(Long id, String name,Double price,String category) {
super();
this.id = id;
this.name = name;
this.price = price;
this.category=category;
}
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 Double getPrice() {
return price;
}
public void setPrice(Double price) {
this.price = price;
}
public String getCategory() {
return category;
}
public void setCategory(String category) {
this.category = category;
}
}
#Repository
public interface ItemRepository extends JpaRepository<Item, Long >{
}
I want to use postman to display table data based on category and price range.
Due to the usage of long as a parameter, I am only able to retrieve item based on id number.
From your question what i understood was that you need to have methods to return data based on Category and Price rather than using the id.
#Repository
public interface ItemRepository extends JpaRepository<Item, Long >{
List<Item> findByCategory(String category);
List<Item> findByPrice(Double price);
}
You can use the Spring JPA Query methods to have default implementations for that as well.
For more information read Official Doc.
Another Example:
List<Item> findByCategoryAndPrice(String category,Double price);
I am using the debugger in IntelliJ and right before the point of returning the result, the array is perfectly fine, as you can see here
But for some reason, the response in the browser looks like this
I don't understand why the fields are invisible.
This is what my 2 models look like:
Municipality:
#Entity
public class Municipality {
#Id
#JsonIgnore
#GeneratedValue(strategy = GenerationType.IDENTITY)
Long id;
String name;
}
Prediction
#Entity
public class Prediction {
#Id
#JsonIgnore
#GeneratedValue(strategy = GenerationType.IDENTITY)
Long id;
LocalDateTime tsPredictionMade;
LocalDateTime tsPredictionFor;
float pm10;
float pm25;
#ManyToOne
#OnDelete(action = OnDeleteAction.CASCADE)
Municipality municipality;
}
And this is my controller:
#RestController
#RequestMapping("/predict")
public class PredictionController {
private MunicipalityService municipalityService;
private PredictionService predictionService;
#Autowired
public PredictionController(MunicipalityService municipalityService, PredictionService predictionService) {
this.municipalityService = municipalityService;
this.predictionService = predictionService;
}
#GetMapping
public List<Municipality> getPredictions(){
List<Municipality> result = municipalityService.getPredictions();
return result;
}
#GetMapping("/{municipality}")
public List<Prediction> getPredictionsForMunicipality(#PathVariable("municipality") String name){
List<Prediction> result = predictionService.getPredictions(name);
return result;
}
}
The rest of the app (service and persistence layer) is pretty standard.
What is the reason for this?
You will need the getters and setters for your models. The Jackson library needs it for accessing its fields when converting the models into JSON, differently from JPA when converting the resultSet into models. Here is the code:
Prediction
#Entity
public class Municipality {
#Id
#JsonIgnore
#GeneratedValue(strategy = GenerationType.IDENTITY)
Long id;
String name;
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public LocalDateTime getTsPredictionMade() {
return tsPredictionMade;
}
public void setTsPredictionMade(LocalDateTime tsPredictionMade) {
this.tsPredictionMade = tsPredictionMade;
}
public LocalDateTime getTsPredictionFor() {
return tsPredictionFor;
}
public void setTsPredictionFor(LocalDateTime tsPredictionFor) {
this.tsPredictionFor = tsPredictionFor;
}
public float getPm10() {
return pm10;
}
public void setPm10(float pm10) {
this.pm10 = pm10;
}
public float getPm25() {
return pm25;
}
public void setPm25(float pm25) {
this.pm25 = pm25;
}
public Municipality getMunicipality() {
return municipality;
}
public void setMunicipality(Municipality municipality) {
this.municipality = municipality;
}
}
Municipality
#Entity
public class Municipality {
#Id
#JsonIgnore
#GeneratedValue(strategy = GenerationType.IDENTITY)
Long id;
String name;
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;
}
}
You need getters and setter for each field that you want to expose.
You can use #Data from lombok project to avoid boilerplate code.
https://projectlombok.org/
My AuditListener
public class EmployeeAuditListeners {
#PrePersist
public void prePersist(Employee employee){
perform(employee,Action.INSERTED);
}
#PreUpdate
public void preUpdate(Employee employee){
perform(employee,Action.UPDATED);
}
#PreRemove
public void preRemove(Employee employee){
perform(employee,Action.DELETED);
}
#Transactional
public void perform(Employee emp, Action action){
EntityManager em = BeanUtil.getBean(EntityManager.class);
CommonLogs commonLogs = new CommonLogs();
commonLogs.setQuery("new query");
em.persist(commonLogs);
}
}
and My Auditable.class
#MappedSuperclass
#EntityListeners(AuditingEntityListener.class)
public abstract class Auditable<U> {
#CreatedBy
protected U createdBy;
#CreatedDate
#Temporal(TemporalType.TIMESTAMP)
protected Date createdDate;
#LastModifiedBy
protected U lastModifiedBy;
#LastModifiedDate
#Temporal(TemporalType.TIMESTAMP)
protected Date lastModifiedDate;
}
My CommonLogs.class
#Entity
#EntityListeners(AuditingEntityListener.class)
public class CommonLogs extends Auditable<String> {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
private String query;
public CommonLogs() {
}
public CommonLogs(String query) {
this.query = query;
}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getQuery() {
return query;
}
public void setQuery(String query) {
this.query = query;
}
}
My Employee.java class
#Entity
#EntityListeners(EmployeeAuditListeners.class)
public class Employee {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
private String name;
private String address;
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 String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
}
and I have a simple Rest Controller
#RestController
#RequestMapping("/api")
public class EmployeeController {
#Autowired
private EmployeeRepository employeeRepository;
#PostMapping("/employees")
public Employee createEmployee(#RequestBody Employee employee){
return employeeRepository.save(employee);
}
}
I want to log it on my table (common_logs) every time i perform some crud operations on my Employee Entity.
the above given example is working to some extent as it successfully stores employee and invokes EmployeeAuditListeners.
but now while saving CommongLog entity i expect it's parent class Auditable to automatically insert createdBy, createdDate etc. for now only query and id is inserted on common_logs table and remaining columns are null.
You can review the documentation for Auditing in here.
To enable the automatic Auditing, you must add the annotation #EnableJpaAuditing in your Application class:
#SpringBootApplication
#EnableJpaAuditing
class Application {
static void main(String[] args) {
SpringApplication.run(Application.class, args)
}
}
If you want the fields #CreatedBy and #LastModifiedBy too, you will also need to implement the AuditorAware<T> interface. For example:
class SpringSecurityAuditorAware implements AuditorAware<User> {
public User getCurrentAuditor() {
Authentication authentication = SecurityContextHolder.getContext().getAuthentication();
if (authentication == null || !authentication.isAuthenticated()) {
return null;
}
return ((MyUserDetails) authentication.getPrincipal()).getUser();
}
}
i am try to create a one to many bidirectional mapping using spring boot and spring data jpa please look the below entity
Employer Entity
#Entity
public class Employer
{
private Long id;
private String employerName;
private List<Employee> employees;
#Id
#GeneratedValue(strategy=GenerationType.AUTO)
public Long getId()
{
return id;
}
public void setId(Long id)
{
this.id = id;
}
public String getEmployerName()
{
return employerName;
}
public void setEmployerName(String employerName)
{
this.employerName = employerName;
}
#OneToMany(cascade=CascadeType.ALL, mappedBy="employer")
public List<Employee> getEmployees()
{
return employees;
}
public void setEmployees(List<Employee> employees)
{
this.employees = employees;
}
}
Employee Entity
#Entity
public class Employee
{
private Long id;
private String employeeName;
private Employer employer;
#Id
#GeneratedValue(strategy=GenerationType.AUTO)
public Long getId()
{
return id;
}
public void setId(Long id)
{
this.id = id;
}
public String getEmployeeName()
{
return employeeName;
}
public void setEmployeeName(String employeeName)
{
this.employeeName = employeeName;
}
#ManyToOne(cascade=CascadeType.ALL, fetch = FetchType.LAZY)
public Employer getEmployer()
{
return employer;
}
public void setEmployer(Employer employer)
{
this.employer = employer;
}
}
Employer Repo
public interface EmployerServices extends JpaRepository<Employer, Long> {
}
Employee Repo
public interface EmployeeServices extends JpaRepository<Employee, Long> {
}
REST Controller is
#RestController
public class Controller {
#Autowired EmployeeServices employeeServices;
#Autowired EmployerServices employerServices;
#GetMapping("/getempr")
public Object getempr(){
return employerServices.findOne(1L);
}
}
now the problem begin start see my out put
its look like a infighting loop and my server throwing error getOutputStream() has already been called for this response.
I used #JsonBackReference & #JsonManagedReference
annotation but the problem is its working like one to many
{
"id":1,
"employerName":"employer",
"employees":[
{"id":1,"employeeName":"emp1"},
{"id":2,"employeeName":"emp2"}
]
}
if I am trying to get in the concern of many to one like all employee with employer. the output is
[
{
"id":1,
"employeeName":"emp1"
},
{
"id":2,
"employeeName":"emp2"}
]
its not showing me the employer details.
please suggets me guys what i am doing wrong. thanks in advance!!
Instead of using #JsonBackReferenceand #JsonManagedReference try to use annotation #JsonIgnoreProperties:
#JsonIgnoreProperties("employer")
private List<Employee> employees;
#JsonIgnoreProperties("employees")
private Employer employer;
It prevents Jackson from rendering a specified properties of associated objects.
with the JSON its a problem with bi-directional mapping. Use the below properties.
#JsonIgnoreProperties("employer")
#JsonIgnoreProperties("employees")
please keep fetching type as eager.
hope this will work.
You can solve your issue with two modification with annotations.
Employer.class
#Entity
public class Employer {
private Long id;
private String employerName;
#OneToMany(cascade = CascadeType.ALL,
mappedBy = "employer",
orphanRemoval = true)
private List<Employee> employees;
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getEmployerName() {
return employerName;
}
public void setEmployerName(String employerName) {
this.employerName = employerName;
}
public List<Employee> getEmployees() {
return employees;
}
public void setEmployees(List<Employee> employees) {
this.employees = employees;
}
}
Employee.class
#Entity
public class Employee {
private Long id;
private String employeeName;
#ManyToOne(fetch = FetchType.LAZY)
#JoinColumn(name = "employer_id")
private Employer employer;
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getEmployeeName() {
return employeeName;
}
public void setEmployeeName(String employeeName) {
this.employeeName = employeeName;
}
public Employer getEmployer() {
return employer;
}
public void setEmployer(Employer employer) {
this.employer = employer;
}
}
For more information please visit this link.
Change your getEmployer Method like this:
#ManyToOne(cascade=CascadeType.ALL, fetch = FetchType.LAZY)
#JsonProperty(access = JsonProperty.Access.WRITE_ONLY)
public Employer getEmployer()
{
return employer;
}
use
#JsonProperty(access = Access.WRITE_ONLY)
private List<Employee> employees;
So that it will ignore employees while printing to JSON in the response (and thus prevents the looping), but will still consider the JSON data (employee list) you pass in the request body so that it is available for persistence.
I have a simple Model in Java called Member with fields - ID (Primary Key), Name (String), Position (String)
I want to expose an POST endpoint to update fields of a member. This method can accept payload like this
{ "id":1,"name":"Prateek"}
or
{ "id":1,"position":"Head of HR"}
and based on the payload received, I update only that particular field. How can I achieve that with JPARepository?
My repository interface is basic -
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;
#Repository("memberRepository")
public interface MemberRepository extends JpaRepository<Member, Integer>{
}
My Member model -
#Entity
#Table(name="members")
public class Member {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
#Column(name="member_id")
private Integer id;
#Column(name="member_name")
#NotNull
private String name;
#Column(name="member_joining_date")
#NotNull
private Date joiningDate = new Date();
#Enumerated(EnumType.STRING)
#Column(name="member_type",columnDefinition="varchar(255) default 'ORDINARY_MEMBER'")
private MemberType memberType = MemberType.ORDINARY_MEMBER;
public Member(Integer id, String name, Date joiningDate) {
super();
this.id = id;
this.name = name;
this.joiningDate = joiningDate;
this.memberType = MemberType.ORDINARY_MEMBER;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Date getJoiningDate() {
return joiningDate;
}
public void setJoiningDate(Date joiningDate) {
this.joiningDate = joiningDate;
}
public MemberType getMemberType() {
return memberType;
}
public void setMemberType(MemberType memberType) {
this.memberType = memberType;
}
public Member(String name) {
this.memberType = MemberType.ORDINARY_MEMBER;
this.joiningDate = new Date();
this.name = name;
}
public Member() {
}
}
Something like this should do the trick
public class MemberService {
#Autowired
MemberRepository memberRepository;
public Member updateMember(Member memberFromRest) {
Member memberFromDb = memberRepository.findById(memberFromRest.getid());
//check if memberFromRest has name or position and update that to memberFromDb
memberRepository.save(memberFromDb);
}
}