SpringBoot 查詢 DTO

Question

由於我的 DTO 課程，我希望檢索數據庫中包含的信息。 問題是如果我不明白為什么我的查詢不起作用......

來自數據庫的實體

@Entity
@Table(name = "historiquedeploiement")
@Data
@NoArgsConstructor
@AllArgsConstructor
public class HistoriqueDeploiement {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Integer id;    

    @ManyToOne(fetch = FetchType.LAZY, optional = false)
    @JoinColumn(name = "idnamespace", nullable = false)    
    @JsonIdentityInfo(generator=ObjectIdGenerators.PropertyGenerator.class, property="id")
    @JsonIdentityReference(alwaysAsId=true)
    @JsonProperty("idnamespace")
    private Namespace namespace;

    @ManyToOne(fetch = FetchType.LAZY, optional = false)
    @JoinColumn(name = "idservice", nullable = false)    
    @JsonIdentityInfo(generator=ObjectIdGenerators.PropertyGenerator.class, property="id")
    @JsonIdentityReference(alwaysAsId=true)
    @JsonProperty("idservice")
    private Service service;

    @NotEmpty
    @Size(max = 100)
    private String tagvalue;
}

DTO :

@Data
@NoArgsConstructor
@AllArgsConstructor
public class HistoriqueDeploiementReadingDTO {
        
        private Integer id;

        @NotEmpty
        private String namespacename;

        @NotEmpty
        private String servicename;
        
        @NotEmpty
        private String tagvalue;

}

我的查詢：

@Repository
public interface HistoriqueDeploiementRepository extends JpaRepository<HistoriqueDeploiement, Integer> {        
    List<HistoriqueDeploiement> findAll();

// Problem Here 
Error creating bean with name 'historiqueDeploiementRepository': FactoryBean threw exception on object creation; nested exception is java.lang.IllegalArgumentException: Validation failed for query for method public abstract java.util.List com.example.jpa.repository.HistoriqueDeploiementRepository.findAllDeploiement()!


    @Query("SELECT new com.example.jpa.dto.HistoriqueDeploiementReadingDTO(historiquedeploiement.id, namespace.namespacename, service.servicename, historiquedeploiement.tagvalue) FROM historiquedeploiement, namespace, service WHERE namespace.id = historiquedeploiement.idnamespace and service.id = historiquedeploiement.idservice")

    List<HistoriqueDeploiementReadingDTO> findAllDeploiement();
}

我的目標是讓這個查詢工作:)

如果您認為您有比解決這個問題更好的主意，請告訴我！ 謝謝

Answer 1

您的 HistoriqueDeploiement 實體缺少 @Entity：

@Entity
public class HistoriqueDeploiement {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Integer id;    

... the rest of the class
}

如果沒有那個標簽 Spring-boot ORM 不知道該類代表一個實體，也不能對其執行查詢。

在這里你可以找到關於 @Entity 標簽的文檔的解釋：

Customer類用@Entity注解，表示它是一個JPA實體。 （因為不存在@Table 注釋，所以假設該實體映射到名為 Customer 的表。）

Answer 2

在我這邊工作的解決方案是這個！

package com.example.jpa.services.historiquedeploiement;

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

import org.modelmapper.ModelMapper;
import org.modelmapper.convention.MatchingStrategies;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.stereotype.Service;

import com.example.jpa.repository.HistoriqueDeploiementRepository;
import com.example.jpa.dto.HistoriqueDeploiementReadingDTO;
import com.example.jpa.model.HistoriqueDeploiement;
@Service
@Configuration
public class MapService {

    @Autowired
    private HistoriqueDeploiementRepository historiqueDeploiementRepository;
    
    @Autowired
    private ModelMapper modelMapper;
    
    @Bean
    public ModelMapper modelMapper() {
       ModelMapper modelMapper = new ModelMapper();
       return modelMapper;
    }
    
    public List<HistoriqueDeploiementReadingDTO> getAllHistorique() {
       return ((List<HistoriqueDeploiement>) historiqueDeploiementRepository
                .findAll())
                .stream()
                .map(this::convertToHistoriqueDeploiementReadingDTO)
                .collect(Collectors.toList());
    }

    private HistoriqueDeploiementReadingDTO convertToHistoriqueDeploiementReadingDTO(HistoriqueDeploiement historiqueDeploiement) { 
        modelMapper.getConfiguration()
                .setMatchingStrategy(MatchingStrategies.LOOSE);
        HistoriqueDeploiementReadingDTO historiqueDeploiementReadingDTO = modelMapper
                .map(historiqueDeploiement, HistoriqueDeploiementReadingDTO.class); 
        return historiqueDeploiementReadingDTO;
    }
}