Java 在选择期间休眠重复的行

几个月前，我用Hibernate 5开始了我的冒险。我正在创建一个Spring引导应用程序，它需要从数据库视图获取数据。 我已经创建了一个JPA实体，并编写了负责运行查询并将结果映射到ORM实体的代码。问题是Hibernate在跟踪中生成正确的查询，但返回第一行的副本作为列表。Hibernate创建的查询如下所示：

select
    revenuesum0_.revenueId as revenueI1_9_,
    revenuesum0_.amount as amount2_9_,
    revenuesum0_.calculatedDate as calculat3_9_,
    revenuesum0_.revenueCalculatedDateId as revenueC4_9_,
    revenuesum0_.categoryName as category5_9_,
    revenuesum0_.timeSpan as timeSpan6_9_,
    revenuesum0_.title as title7_9_,
    revenuesum0_.userId as userId8_9_ 
from
    RevenueSummaryView revenuesum0_ 
where
    revenuesum0_.userId=?;

package org.pbt.model.entity;

import org.springframework.format.annotation.DateTimeFormat;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;
import java.time.LocalDate;


@Entity
@Table(name = "ExpenseSummaryView")
public class ExpenseSummaryView {
    @Id
    @Column(name = "expenseId")
    private int id;

    @Column(name = "expenseCalculatedDateId", nullable = false)
    private int calculatedDateId;

    @Column(name = "userId", nullable = false)
    private int userId;

    @Column(name = "title", nullable = false)
    private String title;

    @Column(name = "amount", nullable = false)
    private double amount;

    @DateTimeFormat(iso = DateTimeFormat.ISO.DATE)
    @Column(name = "calculatedDate", nullable = false)
    private LocalDate calculatedDate;

    @Column(name = "categoryName", nullable = false)
    private String categoryName;

    @Column(name = "timeSpan", nullable = false)
    private String timeSpan;


    public int getId() {
        return id;
    }

    public int getCalculatedDateId() {
        return calculatedDateId;
    }

    public int getUserId() {
        return userId;
    }

    public String getTitle() {
        return title;
    }

    public double getAmount() {
        return amount;
    }

    public LocalDate getCalculatedDate() {
        return calculatedDate;
    }

    public String getCategoryName() {
        return categoryName;
    }

    public String getTimeSpan() {
        return timeSpan;
    }

    @Override
    public String toString() {
        return "{id:" + id + ", calculatedDateId:" + calculatedDateId + ", userId:" + userId + ", title:" + title + ", amount:" + amount + ", calculatedDate:" + calculatedDate.toString() + ", categoryName:" + categoryName + "}";
    }
}

当我在DBeaver和MySQL控制台上运行它时，结果集是正确的。当我尝试使用Java JPA查询执行获取数据时，会出现问题。导致错误的代码如下所示：

    package org.pbt.dao;

    import org.hibernate.Session;
    import org.hibernate.SessionFactory;
    import org.pbt.HibernateUtil;
    import org.pbt.model.entity.ExpenseSummaryView;
    import org.pbt.model.filter.Filter;
    import org.springframework.stereotype.Repository;

    import javax.persistence.Query;
    import java.util.List;


    @Repository
    public class ExpenseSummaryViewDAOImpl implements ExpenseSummaryViewDAO {
        private SessionFactory sessionFactory = HibernateUtil.getSessionFactory();


        @Override
        public List<ExpenseSummaryView> getFiltered(Filter filter) {
            Session session = this.sessionFactory.openSession();
            String hql = "FROM ExpenseSummaryView WHERE userId = :userId ";

            if (filter.getStartDate() != null && filter.getEndDate() != null) {
                hql += "AND calculatedDate BETWEEN :startDate AND :endDate ";
            } else if (filter.getStartDate() != null) {
                hql += "AND calculatedDate >= :startDate ";
            } else if (filter.getEndDate() != null) {
                hql += "AND calculatedDate <= :endDate ";
            }

            Query query = session.createQuery(hql);
            query.setParameter("userId", filter.getUserId());

            if (filter.getStartDate() != null && filter.getEndDate() != null) {
                query.setParameter("startDate", filter.getStartDate());
                query.setParameter("endDate", filter.getEndDate());
            } else if (filter.getStartDate() != null) {
                query.setParameter("startDate", filter.getStartDate());
            } else if (filter.getEndDate() != null) {
                query.setParameter("endDate", filter.getEndDate());
            }

            List<ExpenseSummaryView> expenseSummaryViews = (List<ExpenseSummaryView>) query.getResultList();
            session.close();

            return expenseSummaryViews;
        }
    }

值得一提的是，在非常类似的情况下，我使用hibernate在同一个应用程序中从同一个db上的另一个视图中获取行，它工作正常，但在上面的情况下它不工作

---

是否有人可以提供帮助？

问题的原因是数据库中没有可用的真实ID，expenseId字段在DB中不是真实ID，更改后，源代码开始正常工作。

您的代码和映射似乎是正确的。也许可以查看您的存储库配置？另一方面，您可以将setParameter部分优化为：

if（filter.getStartDate（）！=null）{query.setParameter（“startDate”，filter.getStartDate（）；}否则if（filter.getEndDate（）！=null）{query.setParameter（“endDate”，filter.getEndDate（））；}

Hi，造成问题的原因是数据库中没有可用的真实ID，expenseId字段在DB中不是真实ID，更改后，源代码开始正常工作。