Play Framework 完整實現一個APP（九）

 添加增刪改查操做

 

1.開啓CRUD Module

在/conf/application.conf 中添加

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

　　

在/conf/routes 中添加

# Import CRUD routes
*      /admin              module:crud

　　

須要重啓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 沒法解析爲類型 而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，從新啓動工程便可，可是編譯仍是會出錯，多是沒有引用crud工程的緣由

 

3.建立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爲例

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，若是想顯示大寫，能夠修改/conf/messages

title=Title
content=Content
postedAt=Posted at
author=Author
post=Related post
tags=Tags set
name=Common name
email=Email
password=Password
fullname=Full name
isAdmin=User is admin

　　

 

。。