SpringBoot frame: Construction entity class

SpringBoot frame: Construction entity class

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Built package

• In the project com.xxxunder a new popacket, used to store the entity class

Creating Entity Framework

• BlogEntity classes id、title、content、firstPicture、flag、views、appreaciation、shareStatment、commentabled、published、recommend、createTime、updateTimeinclude: . And set property values are all get、set、toStringmethods, and initializes an empty constructor

  Package com.skgxsn.blog_idea2017.po; 
  
  Import the javax.persistence *. ;
   Import java.util.Date; 
  
  @Entity      // have this corresponds to generating a database annotation before 
  the @Table (name = "t_blog")      // corresponding to the database name 
  public  class Blog { 
  
      the @Id      // identifier Id, on behalf of the primary key 
      @GeneratedValue      // generation strategy Id of 
      Private Long the above mentioned id; 
      
      Private String title;
       Private String Content;
       Private String firstPicture;
       Private String Flag;
       Private Integer views;
       Private boolean appreciation;
      private boolean shareStatment;
      private boolean commentabled;
      private boolean published;
      private boolean recommend;
      @Temporal(TemporalType.TIMESTAMP)       //数据库时间转换
      private Date createTime;
      @Temporal(TemporalType.TIMESTAMP)
      private Date updateTime;
  
      public Blog() {
  
      }
  
      public Long getId() {
          return id;
      }
  
      public void setId(Long id) {
          this.id = id;
      }
  
      public String getTitle() {
          return title;
      }
  
      public void setTitle(String title) {
          this.title = title;
      }
  
      public String getContent() {
          return content;
      }
  
      public void setContent(String content) {
          this.content = content;
      }
  
      public String getFirstPicture() {
          return firstPicture;
      }
  
      public void setFirstPicture(String firstPicture) {
          this.firstPicture = firstPicture;
      }
  
      public String getFlag() {
          return flag;
      }
  
      public void setFlag(String flag) {
          this.flag = flag;
      }
  
      public Integer getViews() {
          return views;
      }
  
      public void setViews(Integer views) {
          this.views = views;
      }
  
      public boolean isAppreciation() {
          return appreciation;
      }
  
      public void setAppreciation(boolean appreciation) {
          this.appreciation = appreciation;
      }
  
      public boolean isShareStatment() {
          return shareStatment;
      }
  
      public void setShareStatment(boolean shareStatment) {
          this.shareStatment = shareStatment;
      }
  
      public boolean isCommentabled() {
          return commentabled;
      }
  
      public void setCommentabled(boolean commentabled) {
          this.commentabled = commentabled;
      }
  
      public boolean isPublished() {
          return published;
      }
  
      public void setPublished(boolean published) {
          this.published = published;
      }
  
      public boolean isRecommend() {
          return recommend;
      }
  
      public void setRecommend(boolean recommend) {
          this.recommend = recommend;
      }
  
      public Date getCreateTime() {
          return createTime;
      }
  
      public void setCreateTime(Date createTime) {
          this.createTime = createTime;
      }
  
      public Date getUpdateTime() {
          return updateTime;
      }
  
      public void setUpdateTime(Date updateTime) {
          this.updateTime = updateTime;
      }
  
      @Override
      public String toString() {
          return "Blog{" +
                  "id=" + id +
                  ", title='" + title + '\'' +
                  ", content='" + content + '\'' +
                  ", firstPicture='" + firstPicture + '\'' +
                  ", flag='" + flag + '\'' +
                  ", views=" + views +
                  ", appreciation=" + appreciation +
                  ", shareStatment=" + shareStatment +
                  ", commentabled=" + commentabled +
                  ", published=" + published +
                  ", recommend=" + recommend +
                  ", createTime=" + createTime +
                  ", updateTime=" + updateTime +
                  '}';
      }
  }

• TypeCategories include:id、name
• TagCategories include:id、name
• CommentCategories include:id、nickname、email、content、avatar、createTime
• UserCategories include:id、niacname、username、passworrd、email、avatar、type、creataTime、updateTime
• Construction of the above properties are get、set、toStringmethods and constructors

Creating correspondence between entities

• Relationships between entities
  • Type 一对多 Blog
  • Blog 多对一 Type
  • In Blog.javaCreate a file of the Blog对应于Type的ManyToOnetype of relationship and create its set、getmethods. In Type.javaCreate a file of the Type对应于Blog的OneToManytype of relationship and create its set、getmethods. Similar to the relationship between the rest of the way to create the type of entity classes

    //Blog.java
    //被维护端
    @ManyToOne
        private Type type;
    
    //Type.java
    //维护端
    @OneToMany(mappedBy = "type")
        private List<Blog> blogs = new ArrayList<>();

• Comments from class relationships
  
  • Parent comment parentCommentcorresponding to the sub comment commentis one to many relationship, in Comment.javaCreate an inline relationship between comments files and creates corresponding get、setmethod:

    @OneToMany(mappedBy = "parentComment")
        private List<Comment> replyComment = new ArrayList<>();
    
        @ManyToOne
        private Comment parentComment;