问

在Spring Data JPA中按类型查询

Carre陈发布于 2023-02-02 19:45

join

我抽象课:

@Entity
@Inheritance(strategy = InheritanceType.JOINED)
public abstract class A {
  ...
}

很少扩展类,如:

@Entity
public class B extends A {
  ...
}

我也有第三个实体:

@Entity
public class C  {

  @OneToOne(cascade = CascadeType.ALL, fetch = FetchType.EAGER)
  private A objectA;
  ...
}

问题是,我如何在C实体存储库中构造Spring Data JPA finder,以仅查询扩展A所需类型的对象？

1 个回答

您可以使用已定义"类型"的鉴别器值的名称

@Entity
@Inheritance(strategy = InheritanceType.JOINED)
@DiscriminatorColumn(name = "type", discriminatorType = DiscriminatorType.STRING)
@Table(name = "abc")
public abstract class Abc {
....

-------------------------------------------

@Query("select a from Abc a where type = ?1")
List<Abc> findByType(String typeValue);

2023-02-02 19:48 回答

ALI韩帅该

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