Java 一对一的关系不起作用

Hibernate版本-5.3.4.Final，mysql连接器版本-8.0.12

我在帖子和帖子内容之间有一个@OneToOne关系：

职位：

这个maven插件：

<plugin>
                <groupId>org.hibernate.orm.tooling</groupId>
                <artifactId>hibernate-enhance-maven-plugin</artifactId>
                <version>5.3.4.Final</version>
                <executions>
                    <execution>
                        <configuration>
                            <failOnError>true</failOnError>
                            <enableLazyInitialization>true</enableLazyInitialization>
                        </configuration>
                        <goals>
                            <goal>enhance</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>

Hibernate sql：

    Hibernate: select postsinfo0_.post_id as post_id1_9_0_, postsinfo0_.createDate as createDa2_9_0_, postsinfo0_.title as title3_9_0_, postsinfo0_.user_id as user_id5_9_0_, postsinfo0_.views as views4_9_0_, postimage1_.post_id as post_id1_6_1_, postimage1_.image_l as image_l2_6_1_, postimage1_.image_m as image_m3_6_1_, postimage1_.image_s as image_s4_6_1_ from postsInfo postsinfo0_ left outer join postImage postimage1_ on postsinfo0_.post_id=postimage1_.post_id where postsinfo0_.post_id=?
Hibernate: select postconten0_.post_id as post_id1_5_0_, postconten0_.content as content2_5_0_, postconten0_.subtitle as subtitle3_5_0_ from postContent postconten0_ where postconten0_.post_id=?
Hibernate: select postinside0_.post_id as post_id3_7_0_, postinside0_.image_id as image_id1_7_0_, postinside0_.image_id as image_id1_7_1_, postinside0_.image as image2_7_1_, postinside0_.post_id as post_id3_7_1_ from postInsideImages postinside0_ where postinside0_.post_id=?
Hibernate: select tagspost0_.post_id as post_id1_10_0_, tagspost0_.tag_id as tag_id2_10_0_, tags1_.tag_id as tag_id1_15_1_, tags1_.description as descript2_15_1_, tags1_.name as name3_15_1_ from PostsTags tagspost0_ inner join Tags tags1_ on tagspost0_.tag_id=tags1_.tag_id where tagspost0_.post_id=?

---

我能做些什么来获得延迟加载？

@Danil Eltsov，这意味着您要对相关集合执行另一个查询。延迟加载无论如何都会生成另一个查询

您的数据库中有设计的味道。因为您没有与父表PK共享子表PK。一对一关联始终共享PK。在您的情况下，PostContent类的postId应仅由PostsInfo类的postId映射。但在PostContent中，PostsInfo有单独的PK和FK，这对于一对一的关系应该是相同的，hibernate也提倡这样做。因为如果你有单独的FK和PK，那么一个PostsInfo可能有多个PostContent。 请浏览以下链接，因为其中解释的场景与您的场景非常相似

---

我会避免完全使用一对一-它们往往会使数据结构复杂化，有时会造成性能问题。如果您正在使用spring的DTO/DAO系统，您可以稍后将数据分为不同的类。@Kilves，现在我使用的是java ee堆栈，如果您建议如何最好地组织数据，那么我很乐意提供任何帮助。我接受了@OneTONE决不会懒散地获取数据，无论您做什么。最后我使用了投影。@user2215545，如果您的意思是从post p中选择new project.dto.post.id，p.name，那么我有一个如何加载集合的问题。如果我需要一个此post的集合n，那么我必须为每个post发出n个请求？这意味着您要为每个post发出一个请求。正如您所见，Hibernate为您生成了4个查询，其中一个查询有一个连接，我认为这是您试图避免的。与代表集合的OneToMany相关的实体在默认情况下将发出一个急切加载。然后，Hibernate会在只有您需要时发出查询。通过投影，您可以手动完成，因此您可以优化查询并避免休眠生成您可能不需要的查询。我正确理解，要接收帖子内容，必须发出第二个请求？然后我可以使用继承加入策略，但我需要一个请求

<property name="hibernate.enhancer.enableLazyInitialization">true</property>

<plugin>
                <groupId>org.hibernate.orm.tooling</groupId>
                <artifactId>hibernate-enhance-maven-plugin</artifactId>
                <version>5.3.4.Final</version>
                <executions>
                    <execution>
                        <configuration>
                            <failOnError>true</failOnError>
                            <enableLazyInitialization>true</enableLazyInitialization>
                        </configuration>
                        <goals>
                            <goal>enhance</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>

@Override
public PostsInfo getCommonPost(long id){
    return session.find(PostsInfo.class, id);
}

    Hibernate: select postsinfo0_.post_id as post_id1_9_0_, postsinfo0_.createDate as createDa2_9_0_, postsinfo0_.title as title3_9_0_, postsinfo0_.user_id as user_id5_9_0_, postsinfo0_.views as views4_9_0_, postimage1_.post_id as post_id1_6_1_, postimage1_.image_l as image_l2_6_1_, postimage1_.image_m as image_m3_6_1_, postimage1_.image_s as image_s4_6_1_ from postsInfo postsinfo0_ left outer join postImage postimage1_ on postsinfo0_.post_id=postimage1_.post_id where postsinfo0_.post_id=?
Hibernate: select postconten0_.post_id as post_id1_5_0_, postconten0_.content as content2_5_0_, postconten0_.subtitle as subtitle3_5_0_ from postContent postconten0_ where postconten0_.post_id=?
Hibernate: select postinside0_.post_id as post_id3_7_0_, postinside0_.image_id as image_id1_7_0_, postinside0_.image_id as image_id1_7_1_, postinside0_.image as image2_7_1_, postinside0_.post_id as post_id3_7_1_ from postInsideImages postinside0_ where postinside0_.post_id=?
Hibernate: select tagspost0_.post_id as post_id1_10_0_, tagspost0_.tag_id as tag_id2_10_0_, tags1_.tag_id as tag_id1_15_1_, tags1_.description as descript2_15_1_, tags1_.name as name3_15_1_ from PostsTags tagspost0_ inner join Tags tags1_ on tagspost0_.tag_id=tags1_.tag_id where tagspost0_.post_id=?