Play Framework 完整实现一个APP（九）

添加增删改查操作

1.开启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

需要重启Server，导入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 {
}

可能会提示错误： CRUD 无法解析为类型 并且运行程序会提示错误

解决办法：

修改 conf/dependencies.yml

require:
    - play
    - play -> crud

运行Shell

> play dependencies

工程下会生成 modules/crud 文件，重新启动工程即可，但是编译还是会出错，可能是没有引用crud工程的原因

3.创建Controller

package controllers;

import models.User;

@CRUD.For(User.class)
public class AdminUsers extends CRUD {

}

4.修改Model，添加验证

以User为例

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;
    }
}

进入http://localhost:9000/admin/  选择add user进入 User Form进行测试

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.页面上显示的Label名字是小写，与对应类的字段名一致，如果想显示大写，可以修改/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

。。