spring数据：使用附加字段获取计数

juud5qan 于 2021-07-16 发布在 Java

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我想返回一个字段加上另一个字段的计数。但我不能把它变成pojo。我只能把它作为对象数组的列表。我有什么：

public interface ChatMessageRepository extends JpaRepository<ChatMessage, Long> {

    @Query(value = "select count(c.is_read), c.chat_id from chat_message c where (c.sender_id = :userId or c.receiver_id = :userId) group by c.chat_id", nativeQuery = true)
    List<Object[]> findAllByUserId(long userId);

但我需要这样的东西：

@Query(value = "select count(c.is_read), c.chat_id from chat_message c where (c.sender_id = :userId or c.receiver_id = :userId) group by c.chat_id", nativeQuery = true)
List<POJO> findAllByUserId(long userId);

@Data
public static class POJO {
    private long count;
    private long id;
}

spring Hibernate spring-data

来源：https://stackoverflow.com/questions/66730132/spring-data-get-count-with-additional-fields

2条答案

按热度按时间

inb24sb21#

找到了答案：

public interface POJO {
    Long getCount();
    Long getId();
}

   @Query(value = "select count(c.isRead) as count,c.chat.chatId as id from ChatMessage c where (c.senderId = :userId or c.receiverId= :userId) group by c.chat.chatId ")
    List<POJO> findAllByUserId(long userId);

赞(0）回复(0）举报 2021-07-16

krugob8w2#

你可以用