Question

有没有办法在基础代理接口上声明@Query，以便您不必在所有存储库中声明它？该查询在＆＃34; FROM＆＃34;中具有不同的实体名称。查询的一部分。

@MappedSuperclass
public abstract class BaseAction {
    @Id
    Long id;
    ...
}

@Entity
@Table(name="AKTION_EMAIL")
public class EmailAction extends BaseAction {
    private String email;
}

public interface ActionRepository<T extends BaseAction> extends JpaRepository<T, ActionPK> {
    @Query("SELECT max(seqNumber) + 1 FROM ????????????? e WHERE e.order = ?1 AND e.action = ?2")
    Long findNextSeqNumberByOrderAndAction(Order order, ActionConfiguration action);
}

public interface EmailActionRepository extends ActionRepository<EmailAction> {
    // This works, but I don't want to repeat that in all entity repositories...
    @Query("SELECT max(seqNumber) + 1 FROM EmailAction e WHERE e.order = ?1 AND e.action = ?2")
    Long findNextSeqNumberByOrderAndAction(Order order, ActionConfiguration action);
}

Answer 1

您可以在通用查询定义中使用SpEL表达式来引用未知实体类型：

interface ActionRepository<T extends BaseAction> extends JpaRepository<T, ActionPK> {

  @Query("SELECT max(seqNumber) + 1 FROM #{#entityName} e WHERE …")
  Long findNextSeqNumberByOrderAndAction(Order ActionConfiguration action);
}

请注意我们如何使用#{#entityName}动态插入将为其创建存储库的实体的名称。

在基本存储库接口上定义@Query

1 个答案: