PlayFramework完整實現一個APP（九）

2019-11-14 15:13:56

字體：大中小

來源：轉載

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添加增刪改查操作

1.開啟CRUD Module

在/conf/application.conf 中添加

# Import the crud modulemodule.crud=${play.path}/modules/crud

在/conf/routes 中添加

# Import CRUD routes*      /admin              module:crud

需要重啟Server，導入CRUD Module

2.添加控制器

/app/controllers

import play.*;import play.mvc.*; public class Posts extends CRUD {    }public class Tags extends CRUD {    }public class Users extends CRUD {    }public class Comments extends CRUD {    }

可能會提示錯誤： CRUD 無法解析為類型 并且運行程序會提示錯誤

解決辦法：

修改 conf/dependencies.yml

require:    - play    - play -> crud

運行Shell

> play dependencies

工程下會生成 modules/crud 文件，重新啟動工程即可，但是編譯還是會出錯，可能是沒有引用crud工程的原因

3.創建Controller

package controllers;import models.User;@CRUD.For(User.class)public class AdminUsers extends CRUD {}

4.修改Model，添加驗證

以User為例

public class User extends Model {    @Email    @Required    public String email;    @Required    @PassWord    public String password;    public String fullname;    public String isAdmin;    public String toString() {        return email;    }}

進入http://localhost:9000/admin/ 選擇add user進入 User Form進行測試

public class Post extends Model {    @Required    public String title;    @Required    public Date postedAt;    @Lob    @Required    @MaxSize(10000)    public String content;    @Required    @ManyToOne    public User author;    @OneToMany(mappedBy = "post", cascade = CascadeType.ALL)    public List<Comment> comments;    @ManyToMany(cascade = CascadeType.PERSIST)    public Set<Tag> tags;}

public class Tag extends Model implements Comparable<Tag> {     @Required        public String name;}

public class Comment extends Model {    @Required    public String author;        @Required    public Date postedAt;    @Lob    @Required        @MaxSize(10000)    public String content;    @ManyToOne    @Required    public Post post;}

5.頁面上顯示的Label名字是小寫，與對應類的字段名一致，如果想顯示大寫，可以修改/conf/messages

title=Titlecontent=ContentpostedAt=Posted atauthor=Authorpost=Related posttags=Tags setname=Common nameemail=Emailpassword=Passwordfullname=Full nameisAdmin=User is admin