一对一的关系不起作用

Question

Hibernate 版本 - 5.3.4.Final，mysql-connector 版本 - 8.0.12我@OneToOne在帖子和帖子内容之间有一种关系：邮政：@Entity@Table(name = "postsInfo")public class PostsInfo {    private long postId;    private String title;    private java.util.Date createDate;    private Integer views;    private Collection<Tags> tagsPost;    private PostContent postContent;    private PostImage postImage;    private UserInfo userInfo;    private List<PostsComments> postsComments;    @Id @GeneratedValue(strategy = GenerationType.IDENTITY)    @Column(name = "post_id", unique = true, nullable = false)    public long getPostId() {        return postId;    }    @Basic    @Column(name = "title", nullable = false)    public String getTitle() {        return title;    }    @Basic    @Column(name = "createDate", nullable = false)    public java.util.Date getCreateDate() {        return createDate;    }    @Basic    @Column(name = "views")    public Integer getViews() {        return views;    }    public PostsInfo(){}    public PostsInfo(String title, List<Tags> tagsPost) {        this.title = title;        this.tagsPost = tagsPost;        this.createDate = new Date();    }    @Fetch(FetchMode.SUBSELECT)    @ManyToMany(fetch = FetchType.EAGER)    @JoinTable(name = "PostsTags",            joinColumns = @JoinColumn(name = "post_id"),            inverseJoinColumns = @JoinColumn(name = "tag_id"))    public Collection<Tags> getTagsPost() {        return tagsPost;    }    @OneToOne(cascade = CascadeType.ALL, mappedBy = "postsInfo", fetch = FetchType.LAZY, optional = false)    public PostContent getPostContent() {        return postContent;    }    @OneToOne(cascade = CascadeType.ALL, mappedBy = "postsInfo", orphanRemoval = true, fetch = FetchType.EAGER)    public PostImage getPostImage() {        return this.postImage;    }    @ManyToOne(fetch = FetchType.LAZY, optional = false)    @JoinColumn(name = "user_id", nullable = false)    public UserInfo getUserInfo() {        return userInfo;    }

Answer 1

这意味着您要对该相关集合进行另一个查询。无论如何，延迟加载会生成另一个查询。