Question

我有两个需要连接在一起的表。

下面是我的模型课

@Data
@Entity
@Table(name="storetypecode")
public class StoreTypeCode implements IModel {

  @Id
  @EqualsAndHashCode.Exclude
  @GeneratedValue(strategy = GenerationType.AUTO)
  private UUID id;

  @Column(name="isenabled", nullable = false)
  private boolean isEnabled = false;

  @Column(name="displaysort", nullable = false)
  private Integer displaySort = 999;

  @Setter(AccessLevel.NONE)
  @OneToMany(fetch = FetchType.EAGER, mappedBy = "storeTypeCode")
  private Set<StoreTypeCodeTranslation> storeTypeCodeTranslationList = new HashSet<>();

  public StoreTypeCode(){
    // Do nothing
  }
}

@Data
@Entity
@Table(name="storetypecodetranslation")
public class StoreTypeCodeTranslation implements IModel {

  @Id
  @EqualsAndHashCode.Exclude
  @GeneratedValue(strategy = GenerationType.AUTO)
  private UUID id;

  @Column(name = "type1")
  private String type1;

  @Column(name = "type2")
  private String type2;

  @Column(name = "lang", nullable = false)
  private String lang="en";

  @Column(name="isdefault", nullable = false)
  private boolean isDefault=false;

  @ManyToOne
  @JsonIgnore
  @ToString.Exclude
  @EqualsAndHashCode.Exclude
  @JoinColumn(name = "storetypecode_id")
  private StoreTypeCode storeTypeCode;

  public StoreTypeCodeTranslation(){
    // Do nothing
  }
}

StoreTypeCodeTranslation表充当StoreTypeCode的转换。在SQL中，我将使用以下命令获取特定语言的StoreTypeCode。

SELECT STC.id, STC.displaysort, STT.type1, STT.type2 
FROM storetypecode AS STC
LEFT JOIN storetypecodetranslation AS STT on STC.id = STT.storetypecode_id
WHERE STT.lang = 'en'
ORDER BY STC.displaysort ASC

如何使用JPARepository获得上面SQL代码中编写的结果？另外，如果没有翻译成语言的StoreTypeCode，它应该返回带有'isDefault = true'的结果。

我还是JPARepository的新手，并试图从其库中获得最大的收益。如果有人可以指导我从哪里开始，将不胜感激。

谢谢

更新------------------------ 我有以下存储库设置。

public interface StoreTypeCodeRepository extends JpaRepository<StoreTypeCode, UUID> {

  @Query(
      value = "SELECT STC.id, STC.displaysort, STT.type1, STT.type2\n"
          + "FROM storetypecode AS STC\n"
          + "LEFT JOIN storetypecodetranslation AS STT on STC.id = STT.storetypecode_id\n"
          + "WHERE STT.lang = ?1\n"
          + "ORDER BY STC.displaysort ASC", nativeQuery = true)
  List<StoreTypeCodeResult> findByLanguage(String language);
}

然后我将StoreTypeCodeResult创建为DTO类，如下所示：

public class StoreTypeCodeResult {

  @Getter
  @Setter
  @Type(type="pg-uuid")
  private UUID id;
  @Getter
  @Setter
  private Integer displaySort = 999;
  @Getter
  @Setter
  private String type1;
  @Getter
  @Setter
  private String type2;

  public StoreTypeCodeResult(){

  }

}

运行代码时，出现错误，提示JDBC类型没有No Dialect映射：1111;嵌套的异常是org.hibernate.MappingException：没有JDBC类型的方言映射：1111

我在这里做错什么了吗？

JpaRepository-如何查询联接表？

0 个答案: