Spring 数据 JPA，hql 查询在 select 请求中加入 @ManyToMany 关系

Question

收入明细：

帐号 table

@Entity
@Table(name = "account_table")
public class Account {
    @Id
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "account_seq_gen")
    @SequenceGenerator(name = "account_seq_gen", sequenceName = "ACCOUNT_SEQ")
    private Long id;
    @ManyToMany(cascade = CascadeType.REMOVE)
    @JoinTable(name = "account_calendar_relation",
            joinColumns = @JoinColumn(name = "account_id"),
            inverseJoinColumns = @JoinColumn(name = "calendar_id")
    )
    private List<Calendar> calendars = new ArrayList<>();

    @ManyToOne
    @JoinColumn(columnDefinition = "user_id")
    private User user;

//...
}

与日历有关

@Entity
@Table(name = "calendar")
public class Calendar {
    @Id
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "calendar_seq_gen")
    @SequenceGenerator(name = "calendar_seq_gen", sequenceName = "CALENDAR_SEQ")
    private Long id;
    @ManyToMany(mappedBy = "calendars")
    private List<Account> accounts;
//...
}

as manyToMany.

我需要通过 userId 使用 spring 数据 JPA 存储库实现从数据库加载轻型日历集合的请求（userId帐户字段）。

我试过了：

@Query(value = "SELECT new com.nextiva.calendar.model.CalendarsCoreInfo(c.id, c.email, c.originalCalendar.id," +
        " c.readOnly, c.deleted)" +
        " FROM Calendar c " +
        " JOIN Account a ON c.accounts IN (a)" +
        " WHERE a.user.id = :userId")
Set<CalendarsCoreInfo> findCalendarsCoreInfoByUserId(@Param("userId") Long usedId);

但应用程序没有启动，出现异常：

Caused by: java.lang.IllegalArgumentException: Validation failed for query for method public abstract java.util.Set com.nextiva.calendar.dao.jpa.CalendarRepository.findCalendarsCoreInfoByUserId(java.lang.Long)!

我尝试应用本机查询：

@Query(value = "SELECT new com.nextiva.calendar.model.CalendarsCoreInfo(c.id, c.email, c.originalCalendar.id," +
        " c.readOnly, c.deleted)" +
        " FROM {h-schema}.calendar c" +
        " JOIN {h-schema}.account_calendar_relation atr ON atr.calendar_id = c.id" +
        " JOIN {h-schema}.account_table account ON account.id = atr.account_id" +
        " WHERE account.user_id = :userId", nativeQuery = true)
Set<CalendarsCoreInfo> findCalendarsCoreInfoByUserId(@Param("userId") Long usedId);

但本机查询不支持自定义结果（CalendarsCoreInfo 在我的例子中）。

问题

据我所知，我可以使用 jdbcTemplate 或将 ManyToMany 实体映射替换为 OneToMany[=50] 来解决此问题=] 和 ManyToOne。但我希望有人知道当前结构修复的优雅解决方案 HQL only.

Answer 1

我的查询部分：

@NamedNativeQueries( {
        @NamedNativeQuery(name = "findCalendarsCoreInfoById",
                query = "SELECT c.id, c.email, c.original_id, c.read_only, c.deleted" +
                        " FROM {h-schema}calendar c" +
                        " JOIN {h-schema}account_calendar_relation atr ON atr.calendar_id = c.id" +
                        " JOIN {h-schema}account_table a ON a.id = atr.account_id" +
                        " WHERE a.user_id = ? ",
                resultSetMapping = "calendarsCoreInfoMapping"
        ),
})

与查询的目标对象对应的映射器：

@SqlResultSetMappings( {
        @SqlResultSetMapping(
                name = "calendarsCoreInfoMapping",
                classes = {
                        @ConstructorResult(
                                targetClass = CalendarsCoreInfo.class,
                                columns = {
                                        @ColumnResult(name = "id", type = Long.class),
                                        @ColumnResult(name = "email", type = String.class),
                                        @ColumnResult(name = "original_id", type = String.class),
                                        @ColumnResult(name = "read_only"),
                                        @ColumnResult(name = "deleted")
                                }
                        )
                }
        ),
})

我已将其放入 Calendar 实体（一些建议是因为不同 JPA 供应商的行为不同）。

为了使我的存储库正常工作，我声明了 Query 指定准备好的查询：

@Query(name = "findCalendarsCoreInfoById", nativeQuery = true)
Set<CalendarsCoreInfo> findCalendarsCoreInfoByUserId(Long userId);

请关注@Query。如果方法名称与查询名称相同，并且它被标记为 nativeQuery = true，那么在查询上映射方法是不够的（这种方式对我不起作用）。如果我也将 name = "findCalendarsCoreInfoById" 添加到 @Query 中，它是固定的。

Spring 数据 JPA，hql 查询在 select 请求中加入 @ManyToMany 关系

Spring data JPA, hql query joining @ManyToMany relation in select request

java

many-to-many

hibernate

hql

spring-data-jpa

收入明细：

问题