Question

期望 - 延迟加载不应该在事务范围之外（例如在休息控制器中），但它可以工作。

在 @Transactional 中

问题，我的配置中的spring应用程序不使用它。我怎么能解决它？

... Rest控制器没有任何事务方法，它只使用specifiedServices来加载实体。如果未在服务中加载，则依赖集合应为空。

应用程序入门级：

@EntityScan("com.vl.pmanager.domain.model")
@EnableJpaRepositories("com.vl.pmanager.domain.repository")

我知道spring boot会自动配置存储库并扫描实体，但我希望... ...

package com.vl.pmanager.domain.repository;

import com.vl.pmanager.domain.model.Tag;
import org.springframework.data.repository.PagingAndSortingRepository;
import org.springframework.stereotype.Repository;
import org.springframework.transaction.annotation.Transactional;

@Repository
@Transactional
public interface TagRepository extends PagingAndSortingRepository<Tag, Long> {
}

此外，我尝试将 @Transactional 添加到存储库界面，但它对我不起作用

package com.vl.pmanager.domain.db.service.api;

import com.vl.pmanager.domain.model.Tag;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.Pageable;

public interface ITagManager {
    Page<Tag> findAll(Pageable pageable);
    Tag findOne(Long id);
}
// ======================== TAG SERVICE WRAPPED WITH TRANSACTION ==========================
package com.vl.pmanager.domain.db.service;

import com.vl.pmanager.domain.db.service.api.ITagManager;
import com.vl.pmanager.domain.model.Tag;
import com.vl.pmanager.domain.repository.TagRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.Pageable;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

@Service
@Transactional
public class TagManager implements ITagManager {
    @Autowired
    private TagRepository tagRepository;

    @Override
    public Page<Tag> findAll(Pageable pageable) {
        return tagRepository.findAll(pageable);
    }

    @Override
    public Tag findOne(Long id) {
        return tagRepository.findOne(id);
    }
}
// ====================== REST CONTROLLER ============================
package com.vl.pmanager.web;

import com.vl.pmanager.domain.db.service.api.ITagManager;
import com.vl.pmanager.domain.model.Tag;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.Pageable;
import org.springframework.data.web.PageableDefault;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping(value = "/tags")
public class TagController {
    private static final int DEFAULT_PAGE_SIZE = 50;

    @Autowired
    private ITagManager tagManager;

    @RequestMapping(method = RequestMethod.GET, consumes = MediaType.ALL_VALUE)
    public Page<Tag> getTags(@PageableDefault(size = DEFAULT_PAGE_SIZE) Pageable pageable) {
        return tagManager.findAll(pageable);
    }

    @RequestMapping(value = "/{id}", method = RequestMethod.GET, consumes = MediaType.ALL_VALUE)
    public Tag getTag(@PathVariable("id") Long id) {
        return tagManager.findOne(id);
    }
}

所以我从存储库中删除了 @Transactional ，创建了其他服务层来使用注释来管理它并将服务注入控制器：

// make request - load data using db service to controller level
Hibernate: select count(tag0_.id) as col_0_0_ from tag tag0_
Hibernate: select tag0_.id as id1_6_, tag0_.description as descript2_6_, tag0_.name as name3_6_ from tag tag0_ limit ?
// converting data to JSON automatically
Hibernate: select projectinf0_.tags as tags1_6_0_, projectinf0_.project_info as project_2_7_0_, projectinf1_.id as id1_4_1_, projectinf1_.description as descript2_4_1_, projectinf1_.name as name3_4_1_ from tag_project_info projectinf0_ inner join project_info projectinf1_ on projectinf0_.project_info=projectinf1_.id where projectinf0_.tags=?
Hibernate: select projectinf0_.tags as tags1_6_0_, projectinf0_.project_info as project_2_7_0_, projectinf1_.id as id1_4_1_, projectinf1_.description as descript2_4_1_, projectinf1_.name as name3_4_1_ from tag_project_info projectinf0_ inner join project_info projectinf1_ on projectinf0_.project_info=projectinf1_.id where projectinf0_.tags=?
Hibernate: select projectinf0_.tags as tags1_6_0_, projectinf0_.project_info as project_2_7_0_, projectinf1_.id as id1_4_1_, projectinf1_.description as descript2_4_1_, projectinf1_.name as name3_4_1_ from tag_project_info projectinf0_ inner join project_info projectinf1_ on projectinf0_.project_info=projectinf1_.id where projectinf0_.tags=?
Hibernate: select projectinf0_.tags as tags1_6_0_, projectinf0_.project_info as project_2_7_0_, projectinf1_.id as id1_4_1_, projectinf1_.description as descript2_4_1_, projectinf1_.name as name3_4_1_ from tag_project_info projectinf0_ inner join project_info projectinf1_ on projectinf0_.project_info=projectinf1_.id where projectinf0_.tags=?
Hibernate: select projectinf0_.tags as tags1_6_0_, projectinf0_.project_info as project_2_7_0_, projectinf1_.id as id1_4_1_, projectinf1_.description as descript2_4_1_, projectinf1_.name as name3_4_1_ from tag_project_info projectinf0_ inner join project_info projectinf1_ on projectinf0_.project_info=projectinf1_.id where projectinf0_.tags=?

Tag实体有一个字段 Set projectInfo 映射到其他实体与 @ManyToMany 的关系 FetchType fetch（）默认LAZY; 所以返回结果不能包含依赖实体，但它是。

我还监控了数据库日志：

{{1}}

我知道只有5个额外请求，因为我只有5个依赖于标记 project_info 。因此，作为结论，我的事务级别不管理事务。 ...我检查了数据源和transactionManager注入bean - 创建了一些。没有错误，在开始时间或运行时间没有警告......

Answer 1

@JBNizet

这不是交易问题。在文档中查找属性spring.jpa.open-in-view，如果不需要，请将其设置为false

我已添加此答案以标记问题，如已关闭。如果我关闭 jpa open in view ，交易就像我预期的那样工作。

对于主持人，请将作者答案更改为@JBNizet

Spring Boot - 事务管理无效

1 个答案: