vue - blog开发学习6
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1、问题,如下图,使用iviewui中的card导致页面不能出现滚动条(不太会弄,在网上查了一个vue组件vuescroll,因此使用这个做滚动条)
2、安装vuescroll
cnpm install -S vuescroll
https://vuescrolljs.yvescoding.org/zh/guide/getting-started.html#%E5%AE%89%E8%A3%85
3、问题:项目使用的jpa操作数据库,因为postclass和post是多堆多的关系,因此post.java和postclass.java如下,
package com.nxz.blog.entity; import lombok.Data; import org.hibernate.annotations.GenericGenerator; import javax.persistence.*; import java.util.HashSet; import java.util.Set; @Entity @Data public class Post @Id @GeneratedValue(generator = "system-uuid") @GenericGenerator(name = "system-uuid", strategy = "uuid") @Column(length = 32) private String postId; private String postTitle; @Lob private String postContent; /** * 摘要,也就是content的前100个字符 */ private String postRemark; private Long createDate; private Long updateDate; @ManyToMany(fetch = FetchType.LAZY) @JoinTable(name = "post_postclass", joinColumns = @JoinColumn(name = "post_id"), inverseJoinColumns = @JoinColumn(name = "post_class_id")) private Set<PostClass> postClasses = new HashSet<>();
package com.nxz.blog.entity; import lombok.Data; import org.hibernate.annotations.GenericGenerator; import javax.persistence.*; import java.util.HashSet; import java.util.Set; @Entity @Data public class PostClass @Id @GeneratedValue(generator = "system-uuid") @GenericGenerator(name = "system-uuid", strategy = "uuid") @Column(length = 32) private String classId; @Column(unique = true,length = 50) private String className; @ManyToMany(mappedBy = "postClasses", fetch = FetchType.LAZY) private Set<Post> posts = new HashSet<>();
但是当调用post.getPostclasses时会出错,会循环输出一下内容:
HHH000100: Fail-safe cleanup (collections) : [email protected]37b2<[email protected]> 2019-06-11 21:30:16.860 WARN 33728 --- [nio-8888-exec-1] o.h.e.loading.internal.LoadContexts : HHH000100: Fail-safe cleanup (collections) : [email protected]2b5b<[email protected]> 2019-06-11 21:30:16.860 WARN 33728 --- [nio-8888-exec-1] o.h.e.loading.internal.LoadContexts : HHH000100: Fail-safe cleanup (collections) : [email protected]60ce<[email protected]> 2019-06-11 21:30:16.860 WARN 33728 --- [nio-8888-exec-1] o.h.e.loading.internal.LoadContexts : HHH000100: Fail-safe cleanup (collections) : [email protected]d7b1<[email protected]> 2019-06-11 21:30:16.860 WARN 33728 --- [nio-8888-exec-1] o.h.e.loading.internal.LoadContexts : H
经过查询资料:https://stackoverflow.com/questions/54946083/jpa-bidirectional-mapping-not-fetching-deep-mapped-data
得知,这个应该是lombok注解@Data导致的,具体原因没有查明,把这个注解去掉,同时自己手写get、set方法和tostring方法,就可以了
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