Question

我正在尝试在SpringBoot中创建一个本机查询返回到DTO。但是，我的SessionFactory正在返回null。我在这里已经阅读了很多问题，但似乎没有人帮忙。

我在这里做错了什么？

application.properties

spring.jpa.properties.hibernate.current_session_context_class=org.springframework.orm.hibernate4.SpringSessionContext

SessionFactoryConfig.class

import org.hibernate.SessionFactory;
import org.hibernate.jpa.HibernateEntityManagerFactory;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class SessionFactoryConfig {

    @Bean
    public SessionFactory sessionFactory(HibernateEntityManagerFactory hemf) {
        return hemf.getSessionFactory();
    }
}

ReportAverageCost.class

import lombok.*;
import org.hibernate.SQLQuery;
import org.hibernate.SessionFactory;
import org.hibernate.transform.ResultTransformer;
import org.hibernate.transform.Transformers;
import org.springframework.beans.factory.annotation.Autowired;

import java.util.Date;
import java.util.List;

@Getter
@Setter
@AllArgsConstructor
@NoArgsConstructor
@Builder
public class ReportAverageCost {

    @Autowired
    private SessionFactory sessionFactory;

    public Date date;

    public List getReportAverageCost() throws Exception {
        String q = "SELECT (...)";

        SQLQuery query = sessionFactory.getCurrentSession().createSQLQuery(q);
        query.addScalar("date");
        ResultTransformer aliasToBean = Transformers.aliasToBean(ReportAverageCost.class);
        List result = query.setResultTransformer(aliasToBean).list();
        return result;
    }
}

Answer 1

在@Component课程中定义注释ReportAverageCost。

Answer 2

这个网站帮助了我：https://blog.pranavek.com/using-hibernate-sessionfactory-in-spring-boot-app/

所以我的代码是这样的：

<强> application.properties

spring.jpa.properties.hibernate.current_session_context_class=thread

<强> ReportAverageCostRepository.class

@Repository
public class ReportAverageCostRepository {

    @Autowired
    private SessionFactory sessionFactory;

    public List getReportAverageCost() throws Exception {
        String q = "SELECT (...)";

        Session session = this.sessionFactory.getCurrentSession();
        session.beginTransaction();

        SQLQuery query = session.createSQLQuery(q);
        query.addScalar("date");
        query.addScalar("transactionIdentifier");
        query.addScalar("amount");
        query.addScalar("cost");
        query.addScalar("price");

        ResultTransformer aliasToBean = Transformers.aliasToBean(ReportAverageCost.class);
        List result = query.setResultTransformer(aliasToBean).list();

        session.getTransaction().commit();

        return result;
    }

}

<强> ReportAverageCostController.class

@RestController
@RequestMapping(value = "/api/v1/reports/averageCost")
public class ReportAverageCostController {

    @Autowired
    ReportAverageCostRepository reportAverageCostRepository;

    @RequestMapping(value = "/{pair}", method = RequestMethod.GET)
    public List<ReportAverageCost> reportAverageCost() throws Exception {
        return reportAverageCostRepository.getReportAverageCost();
    }
}

Spring Boot SessionFactory返回NullPointer

2 个答案: