如何加入和分组 java 中的重复对象列表

Question

我需要帮助。 我试图让 java 返回以验证“历史”查询银行的名称（bankAccount）属性是否相同，如果是，则将日期和总属性分组。如果您有办法调整 SQL 查询以便它使正确的回报更好。

Observation:
The idea of ​​the query is to return the last account balance record by day of the month.

// 你好，我需要帮助。 我正在尝试让 java 返回以验证“历史”查询 // 银行“的名称 //(bankAccount) 属性是否相同，如果是，则将日期和总属性分组。如果你有 //调整 SQL 查询的方法，使其正确返回更好。//
// Observation: // 查询的思路是按月的某天返回最后的账户余额记录。

我

SpringBoot Java Backend return:

    [
    {
        "bankAccount": "Intermedium",
        "day": "2021-12-01T12:55:43.559742",
        "total": 2000.00
    },
    {
        "bankAccount": "Intermedium",
        "day": "2021-12-02T08:37:18.316628",
        "total": 1000.00
    },
    {
        "bankAccount": "Intermedium",
        "day": "2021-12-03T08:20:52.86353",
        "total": 2300.00
    },
    {
        "bankAccount": "Santander",
        "day": "2021-12-01T12:55:54.783701",
        "total": 3000.00
    },
    {
        "bankAccount": "Santander",
        "day": "2021-12-02T08:37:03.832318",
        "total": 2000.00
    },
    {
        "bankAccount": "Santander",
        "day": "2021-12-03T08:21:08.954686",
        "total": 1500.00
    },
    {
        "bankAccount": "Nubank",
        "day": "2021-12-01T12:55:25.98958",
        "total": 1000.00
    },
    {
       "bankAccount": "Nubank",
        "day": "2021-12-02T08:36:54.141208",
        "total": 500.00
    },
    {
       "bankAccount": "Nubank",
        "day": "2021-12-03T08:20:33.213685",
        "total": 700.00
    }
]


What am i trying:
//The idea is to be a single object, being able to have more days and more totals.
[

    {
    "bankAccount": "Intermedium",
    "day": ["2021-12-01T12:55:43.559742","2021-12-02T08:37:18.316628","2021-12- 
           03T08:20:52.86353",]
    "total": [2000.00, 1000.00, 2300.00]
    },

    {
        "bankAccount": "Santander",
        "day": ["2021-12-01T12:55:54.783701","2021-12-02T08:37:03.832318","2021-12- 
               03T08:21:08.954686",]
        "total": [3000.00, 2000.00, 1500.00]
    },

    {
        "bankAccount": "Nubank",
        "day": ["2021-12-01T12:55:25.98958","2021-12-02T08:36:54.141208","2021-12- 
               03T08:20:33.213685",]
        "total": [1000.00, 500.00, 700.00]
    },
   
]

My DTO:

    @AllArgsConstructor
    @Getter
    @Setter
    public class BankAccountHistoryStatisticByDayDTO {

    private String bankAccount;

    private LocalDateTime day;

    private BigDecimal total;


}

My Class:

@Getter
@Setter
@ToString
@RequiredArgsConstructor
@Entity
public class BankAccountHistory extends BaseEntity {


    @NotNull
    private LocalDateTime date;

    @ManyToOne
    @JoinColumn(name = "bank_account_id")
    private BankAccount bankAccount;

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

    @NotNull
    private String name;

    @NotNull
    private BigDecimal balance;


   //EqualsandHash...
}


My Service:

   public List<BankAccountHistoryStatisticByDayDTO> byDay(LocalDateTime monthReference, Long userId) {
        LocalDateTime startDate = monthReference
                .withDayOfMonth(1).withHour(0).withMinute(0).withSecond(0);
        LocalDateTime endDate = monthReference.withDayOfMonth(monthReference.getMonth().maxLength())
                .withHour(23).withMinute(59).withSecond(59);

        List<BankAccountHistory> list = historyRepository.byDay(startDate, endDate, userId);


        List<BankAccountHistoryStatisticByDayDTO> listDto = list.stream()
                .map(obj -> new BankAccountHistoryStatisticByDayDTO(obj.getName(), obj.getDate(), obj.getBalance()))
                .collect(Collectors.toList());

     


        return listDto;
    }

My Repository:

    public interface HistoryRepository extends JpaRepository<BankAccountHistory, Long>,
        JpaSpecificationExecutor<BankAccountHistory> , BankAccountRepositoryQueries {

    @Query(nativeQuery = true, value = "SELECT * " +
            "FROM bank_account_history b1 " +
            "INNER JOIN (SELECT b.name,max(b.date) as maxdate,b.user_id " +
            "FROM bank_account_history b " +
            "GROUP BY b.user_id,b.name, CAST(b.date as date)) as b2 ON b2.user_id = b1.user_id AND b2.name = b1.name AND b2.maxdate = b1.date " +
            "where b1.user_id = :userId " +`enter code here`
            "and b1.date >= :startDate " +
            "AND b1.date <= :endDate " +
            "order by b1.name, b1.date asc ")
    List<BankAccountHistory> byDay(@Param("startDate") LocalDateTime startDate,
                                              @Param("endDate") LocalDateTime endDate, Long userId);
}