Operations at JPA

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Operations at JPA

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Good morning I'm developing an application in which the user has to inform the system of a list of exams and the system to display the laboratory units that perform such exams, but I have a question about the way in which to record in the bank the examinations carried out by X drive all other data is already being stored as it should be stored.

This is the diagram template I developed for the application

DomainClasses/Entities

UnitLab.java

packagecom.moliveiralucas.easylab.domain;importjava.io.Serializable;importjava.util.ArrayList;importjava.util.List;importjavax.persistence.Entity;importjavax.persistence.GeneratedValue;importjavax.persistence.GenerationType;importjavax.persistence.Id;importjavax.persistence.JoinColumn;importjavax.persistence.JoinTable;importjavax.persistence.ManyToMany;importjavax.persistence.ManyToOne;importcom.fasterxml.jackson.annotation.JsonIgnore;@EntitypublicclassUnidadeLaboratorioimplementsSerializable{privatestaticfinallongserialVersionUID=1L;/*ATRIBUTOSBASICOS*/@Id@GeneratedValue(strategy=GenerationType.IDENTITY)privateIntegerid_UnidadeLaboratorio;privateStringnomeUnidade;privateStringlogradouro;privateStringcomplemento;privateStringnumero;privateStringtelefone;/*RELACIONAMENTOS*/@JsonIgnore@ManyToOne@JoinColumn(name="id_laboratorio")
    private Laboratorio laboratorio;

    @ManyToOne
    @JoinColumn(name = "id_cidade")
    private Cidade cidade;

    @JsonIgnore
    @ManyToMany
    @JoinTable(name = "EXAMES_REALIZADOS", joinColumns = @JoinColumn(name = "id_unidade"), inverseJoinColumns = @JoinColumn(name = "id_exame"))
    private List<Exame> exames = new ArrayList<>();

    /* CONSTRUTORES */

    public UnidadeLaboratorio() {
    }

    public UnidadeLaboratorio(Integer id_UnidadeLaboratorio, String nomeUnidade, String logradouro, String complemento,
        String numero, String telefone, Cidade cidade, Laboratorio laboratorio) {
        super();
        this.id_UnidadeLaboratorio = id_UnidadeLaboratorio;
        this.nomeUnidade = nomeUnidade;
        this.logradouro = logradouro;
        this.complemento = complemento;
        this.numero = numero;
        this.telefone = telefone;
        this.cidade = cidade;
        this.laboratorio = laboratorio;
    }

    /* GETTERS AND SETTERS */

    public Integer getId_UnidadeLaboratorio() {
        return id_UnidadeLaboratorio;
    }

    public void setId_UnidadeLaboratorio(Integer id_UnidadeLaboratorio) {
        this.id_UnidadeLaboratorio = id_UnidadeLaboratorio;
    }

    public String getNomeUnidade() {
        return nomeUnidade;
    }

    public void setNomeUnidade(String nomeUnidade) {
        this.nomeUnidade = nomeUnidade;
    }

    public String getLogradouro() {
        return logradouro;
    }

    public void setLogradouro(String logradouro) {
        this.logradouro = logradouro;
    }

    public String getComplemento() {
        return complemento;
    }

    public void setComplemento(String complemento) {
        this.complemento = complemento;
    }

    public String getNumero() {
        return numero;
    }

    public void setNumero(String numero) {
        this.numero = numero;
    }

    public String getTelefone() {
        return telefone;
    }

    public void setTelefone(String telefone) {
        this.telefone = telefone;
    }

    public Cidade getCidade() {
        return cidade;
    }

    public void setCidade(Cidade cidade) {
        this.cidade = cidade;
    }

    public Laboratorio getLaboratorio() {
        return laboratorio;
    }

    public void setLaboratorio(Laboratorio laboratorio) {
        this.laboratorio = laboratorio;
    }

    public List<Exame> getExames() {
        return exames;
    }

    public void setExames(List<Exame> exames) {
        this.exames = exames;
    }

    /* HASHCODE AND EQUALS */

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((id_UnidadeLaboratorio == null) ? 0 : id_UnidadeLaboratorio.hashCode());
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        UnidadeLaboratorio other = (UnidadeLaboratorio) obj;
        if (id_UnidadeLaboratorio == null) {
            if (other.id_UnidadeLaboratorio != null)
                return false;
        } else if (!id_UnidadeLaboratorio.equals(other.id_UnidadeLaboratorio))
            return false;
        return true;
    }

}

Exam.java

package com.moliveiralucas.easylab.domain;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.ManyToMany;

import com.fasterxml.jackson.annotation.JsonIgnore;

@Entity
public class Exame implements Serializable {
    private static final long serialVersionUID = 1L;

    /* ATRIBUTOS BASICOS */

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Integer id_Exame;
    private String exame;
    private String sigla;

    /* RELACIONAMENTOS */

    @JsonIgnore
    @ManyToMany(mappedBy = "exames")
    private List<UnidadeLaboratorio> unidades = new ArrayList<>();

    /* CONSTRUTORES */
    public Exame() {
    }

    public Exame(Integer id_Exame, String exame, String sigla) {
        super();
        this.id_Exame = id_Exame;
        this.exame = exame;
        this.sigla = sigla;
    }

    /* GETTERS AND SETTERS */

    public Integer getId_Exame() {
        return id_Exame;
    }

    public void setId_Exame(Integer id_Exame) {
        this.id_Exame = id_Exame;
    }

    public String getExame() {
        return exame;
    }

    public void setExame(String exame) {
        this.exame = exame;
    }

    public String getSigla() {
        return sigla;
    }

    public void setSigla(String sigla) {
        this.sigla = sigla;
    }

    public List<UnidadeLaboratorio> getUnidades() {
        return unidades;
    }

    public void setUnidades(List<UnidadeLaboratorio> unidades) {
        this.unidades = unidades;
    }

    /* HASHCODE AND EQUALS */

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((id_Exame == null) ? 0 : id_Exame.hashCode());
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        Exame other = (Exame) obj;
        if (id_Exame == null) {
            if (other.id_Exame != null)
                return false;
        } else if (!id_Exame.equals(other.id_Exame))
            return false;
        return true;
    }

}

Data Transfer Object (DTO) Classes

UnitLaboratoryDTO.java

package com.moliveiralucas.easylab.dto;

import java.io.Serializable;

import javax.validation.constraints.NotEmpty;

import org.hibernate.validator.constraints.Length;

import com.moliveiralucas.easylab.domain.UnidadeLaboratorio;

public class UnidadeLaboratorioDTO implements Serializable {
    private static final long serialVersionUID = 1L;

    private Integer id_UnidadeLaboratorio;
    @NotEmpty(message = "Preenchimento obrigatório")
    @Length(min = 3, max = 50, message = "O campo nomeUnidade deve conter entre 3 e 50 caracteres")
    private String nomeUnidade;
    @NotEmpty(message = "Preenchimento obrigatório")
    @Length(min = 3, max = 50, message = "O campo Logradouro deve conter entre 3 e 50 caracteres")
    private String logradouro;
    @NotEmpty(message = "Preenchimento obrigatório")
    @Length(min = 3, max = 50, message = "O campo Complemento deve conter entre 3 e 50 caracteres")
    private String complemento;
    private String numero;
    private String telefone;

    public UnidadeLaboratorioDTO() {
    }

    public UnidadeLaboratorioDTO(UnidadeLaboratorio obj) {
        id_UnidadeLaboratorio = obj.getId_UnidadeLaboratorio();
        nomeUnidade = obj.getNomeUnidade();
        logradouro = obj.getLogradouro();
        complemento = obj.getComplemento();
        numero = obj.getNumero();
        telefone = obj.getTelefone();
    }

    public Integer getId_UnidadeLaboratorio() {
        return id_UnidadeLaboratorio;
    }

    public void setId_UnidadeLaboratorio(Integer id_UnidadeLaboratorio) {
        this.id_UnidadeLaboratorio = id_UnidadeLaboratorio;
    }

    public String getNomeUnidade() {
        return nomeUnidade;
    }

    public void setNomeUnidade(String nomeUnidade) {
        this.nomeUnidade = nomeUnidade;
    }

    public String getLogradouro() {
        return logradouro;
    }

    public void setLogradouro(String logradouro) {
        this.logradouro = logradouro;
    }

    public String getComplemento() {
        return complemento;
    }

    public void setComplemento(String complemento) {
        this.complemento = complemento;
    }

    public String getNumero() {
        return numero;
    }

    public void setNumero(String numero) {
        this.numero = numero;
    }

    public String getTelefone() {
        return telefone;
    }

    public void setTelefone(String telefone) {
        this.telefone = telefone;
    }

}

TestDTO.java

package com.moliveiralucas.easylab.dto;

import java.io.Serializable;

import javax.validation.constraints.NotEmpty;

import org.hibernate.validator.constraints.Length;

import com.moliveiralucas.easylab.domain.Exame;

public class ExameDTO implements Serializable {
    private static final long serialVersionUID = 1L;

    private Integer id_Exame;
    @NotEmpty(message = "Preenchimento obrigatório")
    @Length(min = 3, max = 60, message = "O campo Exame deve ser entre 3 e 60 caracteres")
    private String exame;
    @NotEmpty(message = "Preenchimento obrigatório")
    @Length(min = 2, max = 6, message = "O campo Sigla deve ser entre 3 e 6 caracteres")
    private String sigla;

    public ExameDTO() {
    }

    public ExameDTO(Exame obj) {
        super();
        id_Exame = obj.getId_Exame();
        exame = obj.getExame();
        sigla = obj.getSigla();
    }

    public Integer getId_Exame() {
        return id_Exame;
    }

    public void setId_Exame(Integer id_Exame) {
        this.id_Exame = id_Exame;
    }

    public String getExame() {
        return exame;
    }

    public void setExame(String exame) {
        this.exame = exame;
    }

    public String getSigla() {
        return sigla;
    }

    public void setSigla(String sigla) {
        this.sigla = sigla;
    }

}

Repositories (JpaRepository)

Unity LabRepository.java

    package com.moliveiralucas.easylab.repositories;

    import org.springframework.data.jpa.repository.JpaRepository;
    import org.springframework.stereotype.Repository;

    import com.moliveiralucas.easylab.domain.UnidadeLaboratorio;

    @Repository
    public interface UnidadeLaboratorioRepository extends JpaRepository<UnidadeLaboratorio, Integer> {

    }

ExamRepository.java

    package com.moliveiralucas.easylab.repositories;

    import org.springframework.data.jpa.repository.JpaRepository;
    import org.springframework.stereotype.Repository;

    import com.moliveiralucas.easylab.domain.Exame;

    @Repository
    public interface ExameRepository extends JpaRepository<Exame, Integer> {
        /*
         * @Transactional(readOnly=true)
         * 
         * @Query("SELECT obj FROM exames_realizados obj WHERE obj.exame.id_exame = :exames.exame_id"
         * ) List<Exame> findAllExames(ArrayList<Exame> exames);
         */
    }

The comment commented out in the class ExameRepository.java and it popped an exception saying that "done_examples" was not mapped, so I was in doubt if I was to create a class to map this relationship or it was already being mapped in the domain classes. / p>

RestController classes

Laboratory UnitResouce.java

    package com.moliveiralucas.easylab.resources;

    import java.net.URI;
    import java.util.List;
    import java.util.stream.Collectors;

    import javax.validation.Valid;

    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.data.domain.Page;
    import org.springframework.http.ResponseEntity;
    import org.springframework.web.bind.annotation.PathVariable;
    import org.springframework.web.bind.annotation.RequestBody;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestMethod;
    import org.springframework.web.bind.annotation.RequestParam;
    import org.springframework.web.bind.annotation.RestController;
    import org.springframework.web.servlet.support.ServletUriComponentsBuilder;

    import com.moliveiralucas.easylab.domain.UnidadeLaboratorio;
    import com.moliveiralucas.easylab.dto.UnidadeLaboratorioDTO;
    import com.moliveiralucas.easylab.dto.UnidadeLaboratorioNewDTO;
    import com.moliveiralucas.easylab.services.UnidadeLaboratorioService;

    @RestController
    @RequestMapping(value = "/unidadeLaboratorios")
    public class UnidadeLaboratorioResource {

        @Autowired
        private UnidadeLaboratorioService service;

        @RequestMapping(value = "/{id}", method = RequestMethod.GET)
        public ResponseEntity<?> find(@PathVariable Integer id) {
            UnidadeLaboratorio obj = service.find(id);
            return ResponseEntity.ok().body(obj);
        }

        @RequestMapping(method = RequestMethod.GET)
        public ResponseEntity<List<UnidadeLaboratorioDTO>> findAll() {
            List<UnidadeLaboratorio> list = service.findAll();
            List<UnidadeLaboratorioDTO> listDto = list.stream().map(obj -> new UnidadeLaboratorioDTO(obj))
                    .collect(Collectors.toList());
            return ResponseEntity.ok().body(listDto);
        }

        @RequestMapping(value = "/page", method = RequestMethod.GET)
        public ResponseEntity<Page<UnidadeLaboratorioDTO>> findPage( // page?page=XXX&linesPerPage=XXX&orderBy=XXX&direction=XXX
                @RequestParam(value = "page", defaultValue = "0") Integer page,
                @RequestParam(value = "linesPerPage", defaultValue = "24") Integer linesPerPage,
                @RequestParam(value = "orderBy", defaultValue = "laboratorio") String orderBy,
                @RequestParam(value = "direction", defaultValue = "ASC") String direction) {
            Page<UnidadeLaboratorio> list = service.findPage(page, linesPerPage, orderBy, direction);
            Page<UnidadeLaboratorioDTO> listDto = list.map(obj -> new UnidadeLaboratorioDTO(obj));
            return ResponseEntity.ok().body(listDto);
        }

        @RequestMapping(method = RequestMethod.POST)
        public ResponseEntity<Void> insert(@Valid @RequestBody UnidadeLaboratorioNewDTO objDto) {
            UnidadeLaboratorio obj = service.fromNewDTO(objDto);
            obj = service.insert(obj);
            URI uri = ServletUriComponentsBuilder.fromCurrentRequest().path("/{id}")
                    .buildAndExpand(obj.getId_UnidadeLaboratorio()).toUri();
            return ResponseEntity.created(uri).build();
        }

        @RequestMapping(value = "/{id}", method = RequestMethod.PUT)
        public ResponseEntity<Void> update(@PathVariable Integer id, @Valid @RequestBody UnidadeLaboratorioDTO objDto) {
            UnidadeLaboratorio obj = service.fromDTO(objDto);
            obj.setId_UnidadeLaboratorio(id);
            obj = service.update(obj);
            return ResponseEntity.noContent().build();
        }

        @RequestMapping(value = "/{id}", method = RequestMethod.DELETE)
        public ResponseEntity<Void> delete(@PathVariable Integer id) {
            service.delete(id);
            return ResponseEntity.noContent().build();
        }

    }

ExameResource.java

    package com.moliveiralucas.easylab.resources;

    import java.net.URI;
    import java.util.List;
    import java.util.stream.Collectors;

    import javax.validation.Valid;

    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.data.domain.Page;
    import org.springframework.http.ResponseEntity;
    import org.springframework.web.bind.annotation.PathVariable;
    import org.springframework.web.bind.annotation.RequestBody;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestMethod;
    import org.springframework.web.bind.annotation.RequestParam;
    import org.springframework.web.bind.annotation.RestController;
    import org.springframework.web.servlet.support.ServletUriComponentsBuilder;

    import com.moliveiralucas.easylab.domain.Exame;
    import com.moliveiralucas.easylab.dto.ExameDTO;
    import com.moliveiralucas.easylab.services.ExameService;

    @RestController
    @RequestMapping(value = "/exames")
    public class ExameResource {

        @Autowired
        private ExameService service;

        @RequestMapping(value = "/{id}", method = RequestMethod.GET)
        public ResponseEntity<?> find(@PathVariable Integer id) {
            Exame obj = service.find(id);
            return ResponseEntity.ok().body(obj);
        }

        @RequestMapping(method = RequestMethod.GET)
        public ResponseEntity<List<ExameDTO>> findAll() {
            List<Exame> list = service.findAll();
            List<ExameDTO> listDto = list.stream().map(obj -> new ExameDTO(obj)).collect(Collectors.toList());
            return ResponseEntity.ok().body(listDto);
        }

        @RequestMapping(value = "/page", method = RequestMethod.GET)
        public ResponseEntity<Page<ExameDTO>> findPage( // page?page=XXXX&linesPerPage=XXXX&orderBy=XXXX&direction=XXXX
                @RequestParam(value = "page", defaultValue = "0") Integer page,
                @RequestParam(value = "linesPerPage", defaultValue = "24") Integer linesPerPage,
                @RequestParam(value = "orderBy", defaultValue = "exame") String orderBy,
                @RequestParam(value = "direction", defaultValue = "ASC") String direction) {
            Page<Exame> list = service.findPage(page, linesPerPage, orderBy, direction);
            Page<ExameDTO> listDto = list.map(obj -> new ExameDTO(obj));
            return ResponseEntity.ok().body(listDto);
        }

        @RequestMapping(method = RequestMethod.POST)
        public ResponseEntity<Void> insert(@Valid @RequestBody ExameDTO objDto) {
            Exame obj = service.fromDTO(objDto);
            obj = service.insert(obj);
            URI uri = ServletUriComponentsBuilder.fromCurrentRequest().path("/{id}").buildAndExpand(obj.getId_Exame())
                    .toUri();
            return ResponseEntity.created(uri).build();
        }

        @RequestMapping(value = "/{id}", method = RequestMethod.PUT)
        public ResponseEntity<Void> update(@PathVariable Integer id, @Valid @RequestBody ExameDTO objDto) {
            Exame obj = service.fromDTO(objDto);
            obj.setId_Exame(id);
            obj = service.update(obj);
            return ResponseEntity.noContent().build();
        }

        @RequestMapping(value = "/{id}", method = RequestMethod.DELETE)
        public ResponseEntity<Void> delete(@PathVariable Integer id) {
            service.delete(id);
            return ResponseEntity.noContent().build();
        }

    }

Service Classes

UnitLaboratoryService.java

    package com.moliveiralucas.easylab.services;

    import java.util.List;
    import java.util.Optional;

    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.dao.DataIntegrityViolationException;
    import org.springframework.data.domain.Page;
    import org.springframework.data.domain.PageRequest;
    import org.springframework.data.domain.Sort.Direction;
    import org.springframework.stereotype.Service;
    import org.springframework.transaction.annotation.Transactional;

    import com.moliveiralucas.easylab.domain.Cidade;
    import com.moliveiralucas.easylab.domain.Laboratorio;
    import com.moliveiralucas.easylab.domain.UnidadeLaboratorio;
    import com.moliveiralucas.easylab.dto.UnidadeLaboratorioDTO;
    import com.moliveiralucas.easylab.dto.UnidadeLaboratorioNewDTO;
    import com.moliveiralucas.easylab.repositories.UnidadeLaboratorioRepository;
    import com.moliveiralucas.easylab.services.exceptions.DataIntegrityException;
    import com.moliveiralucas.easylab.services.exceptions.ObjectNotFoundException;

    @Service
    public class UnidadeLaboratorioService {

        @Autowired
        private UnidadeLaboratorioRepository repo;

        public UnidadeLaboratorio find(Integer id) {
            Optional<UnidadeLaboratorio> obj = repo.findById(id);
            return obj.orElseThrow(() -> new ObjectNotFoundException(
                    "Objeto não encontrado! ID: " + id + ", Tipo: " + UnidadeLaboratorio.class.getName()));
        }

        public List<UnidadeLaboratorio> findAll() {
            return repo.findAll();
        }

        public Page<UnidadeLaboratorio> findPage(Integer page, Integer linesPerPage, String orderBy, String direction) {
            PageRequest pageRequest = PageRequest.of(page, linesPerPage, Direction.valueOf(direction), orderBy);
            return repo.findAll(pageRequest);
        }

        @Transactional
        public UnidadeLaboratorio insert(UnidadeLaboratorio obj) {
            obj.setId_UnidadeLaboratorio(null);
            return repo.save(obj);
        }

        public UnidadeLaboratorio update(UnidadeLaboratorio obj) {
            UnidadeLaboratorio newObj = find(obj.getId_UnidadeLaboratorio());
            updateData(newObj, obj);
            return repo.save(newObj);
        }

        private void updateData(UnidadeLaboratorio newObj, UnidadeLaboratorio obj) {
            newObj.setNomeUnidade(obj.getNomeUnidade());
            newObj.setLogradouro(obj.getLogradouro());
            newObj.setComplemento(obj.getComplemento());
            newObj.setNumero(obj.getNumero());
            newObj.setTelefone(obj.getTelefone());
        }

        public void delete(Integer id) {
            find(id);
            try {
                repo.deleteById(id);
            } catch (DataIntegrityViolationException e) {
                throw new DataIntegrityException("Não é possível excluir!");
            }
        }

        public UnidadeLaboratorio fromDTO(UnidadeLaboratorioDTO objDto) {
            return new UnidadeLaboratorio(objDto.getId_UnidadeLaboratorio(), objDto.getNomeUnidade(),
                    objDto.getLogradouro(), objDto.getComplemento(), objDto.getNumero(), objDto.getTelefone(), null, null);
        }

        public UnidadeLaboratorio fromNewDTO(UnidadeLaboratorioNewDTO objDto) {
            Laboratorio laboratorio = new Laboratorio(objDto.getId_Laboratorio(), null, null, null);
            Cidade cidade = new Cidade(objDto.getId_Cidade(), null, null);
            UnidadeLaboratorio unidadeLaboratorio = new UnidadeLaboratorio(null, objDto.getNomeUnidade(),
                    objDto.getLogradouro(), objDto.getComplemento(), objDto.getNumero(), objDto.getTelefone(), cidade,
                    laboratorio);
            laboratorio.getUnidades().add(unidadeLaboratorio);
            return unidadeLaboratorio;
        }
    }

ExameService.java

    package com.moliveiralucas.easylab.services;

    import java.util.List;
    import java.util.Optional;

    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.dao.DataIntegrityViolationException;
    import org.springframework.data.domain.Page;
    import org.springframework.data.domain.PageRequest;
    import org.springframework.data.domain.Sort.Direction;
    import org.springframework.stereotype.Service;

    import com.moliveiralucas.easylab.domain.Exame;
    import com.moliveiralucas.easylab.dto.ExameDTO;
    import com.moliveiralucas.easylab.repositories.ExameRepository;
    import com.moliveiralucas.easylab.services.exceptions.DataIntegrityException;
    import com.moliveiralucas.easylab.services.exceptions.ObjectNotFoundException;

    @Service
    public class ExameService {

        @Autowired
        private ExameRepository repo;

        public Exame find(Integer id) {
            Optional<Exame> obj = repo.findById(id);
            return obj.orElseThrow(() -> new ObjectNotFoundException(
                    "Objeto não encontrado! ID: " + id + ", Tipo: " + Exame.class.getName()));
        }

        public List<Exame> findAll() {
            return repo.findAll();
        }

        public Page<Exame> findPage(Integer page, Integer linesPerPage, String orderBy, String direction) {
            PageRequest pageRequest = PageRequest.of(page, linesPerPage, Direction.valueOf(direction), orderBy);
            return repo.findAll(pageRequest);
        }

        public Exame insert(Exame obj) {
            obj.setId_Exame(null);
            return repo.save(obj);
        }

        public Exame update(Exame obj) {
            Exame newObj = find(obj.getId_Exame());
            updateData(newObj, obj);
            return repo.save(newObj);
        }

        private void updateData(Exame newObj, Exame obj) {
            newObj.setExame(obj.getExame());
            newObj.setSigla(obj.getSigla());
        }

        public void delete(Integer id) {
            find(id);
            try {
                repo.deleteById(id);
            } catch (DataIntegrityViolationException e) {
                throw new DataIntegrityException("Não é possível excluir!");
            }
        }

        public Exame fromDTO(ExameDTO objDto) {
            return new Exame(objDto.getId_Exame(), objDto.getExame(), objDto.getSigla());
        }

    }

These are the classes I'm using to keep the exams and the units, the one my question is, should I create a new class to maintain / map this relationship between the Lab unit and the exam so that I can manipulate the data in it or I should only make a responsible method for such a thing.

The repository in which the entire project is stored is: Github

From now thank you for the collaboration of everyone :)

java hibernate jpa spring-boot

asked by anonymous 10.10.2018 / 16:27

1 answer

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score 0 · Accepted Answer

I need to create a new class to maintain / map this relationship between Lab unit and exam so I can manipulate the data in it

Yes, I think you will need to do this. Because the relationship between them is many-to-many ( @ManyToMany ), you need an intermediate table to bind the identifiers of the unidadeLaboratorio and exame tables, a unidadeLaboratorio_exame table. Example:

unidadeLaboratorio_id | exame_id
1                     | 10
2                     | 11
2                     | 10

For ease, usually include an ID in this table as well. So the mapping would look something like:

@Entity
class UnidadeLaboratorioExame {

    @Id
    private Long id;

    @ManyToOne
    private Exame exame;

    @ManyToOne
    private UnidadeLaboratorio unidade;

}

And in the UnidadeLaboratorio and Exame v, the relationship with UnidadeLaboratorioExame is @OneToMany . The idea here is to not use @ManyToMany and you have control of this table, getting mapped in your application.