有了ORM，我們就可以把Web App需要的3個表用Model表示出來：

import time, uuidfrom transwarp.db import next_idfrom transwarp.orm import Model, StringField, BooleanField, FloatField, TextFieldclass User(Model):  __table__ = 'users'  id = StringField(primary_key=True, default=next_id, ddl='varchar(50)')  email = StringField(updatable=False, ddl='varchar(50)')  password = StringField(ddl='varchar(50)')  admin = BooleanField()  name = StringField(ddl='varchar(50)')  image = StringField(ddl='varchar(500)')  created_at = FloatField(updatable=False, default=time.time)class Blog(Model):  __table__ = 'blogs'  id = StringField(primary_key=True, default=next_id, ddl='varchar(50)')  user_id = StringField(updatable=False, ddl='varchar(50)')  user_name = StringField(ddl='varchar(50)')  user_image = StringField(ddl='varchar(500)')  name = StringField(ddl='varchar(50)')  summary = StringField(ddl='varchar(200)')  content = TextField()  created_at = FloatField(updatable=False, default=time.time)class Comment(Model):  __table__ = 'comments'  id = StringField(primary_key=True, default=next_id, ddl='varchar(50)')  blog_id = StringField(updatable=False, ddl='varchar(50)')  user_id = StringField(updatable=False, ddl='varchar(50)')  user_name = StringField(ddl='varchar(50)')  user_image = StringField(ddl='varchar(500)')  content = TextField()  created_at = FloatField(updatable=False, default=time.time)

在編寫ORM時，給一個Field增加一個default參數可以讓ORM自己填入缺省值，非常方便。并且，缺省值可以作為函數對象傳入，在調用insert()時自動計算。

例如，主鍵id的缺省值是函數next_id，創建時間created_at的缺省值是函數time.time，可以自動設置當前日期和時間。

日期和時間用float類型存儲在數據庫中，而不是datetime類型，這么做的好處是不必關心數據庫的時區以及時區轉換問題，排序非常簡單，顯示的時候，只需要做一個float到str的轉換，也非常容易。
初始化數據庫表

如果表的數量很少，可以手寫創建表的SQL腳本：

-- schema.sqldrop database if exists awesome;create database awesome;use awesome;grant select, insert, update, delete on awesome.* to 'www-data'@'localhost' identified by 'www-data';create table users (  `id` varchar(50) not null,  `email` varchar(50) not null,  `password` varchar(50) not null,  `admin` bool not null,  `name` varchar(50) not null,  `image` varchar(500) not null,  `created_at` real not null,  unique key `idx_email` (`email`),  key `idx_created_at` (`created_at`),  primary key (`id`)) engine=innodb default charset=utf8;create table blogs (  `id` varchar(50) not null,  `user_id` varchar(50) not null,  `user_name` varchar(50) not null,  `user_image` varchar(500) not null,  `name` varchar(50) not null,  `summary` varchar(200) not null,  `content` mediumtext not null,  `created_at` real not null,  key `idx_created_at` (`created_at`),  primary key (`id`)) engine=innodb default charset=utf8;create table comments (  `id` varchar(50) not null,  `blog_id` varchar(50) not null,  `user_id` varchar(50) not null,  `user_name` varchar(50) not null,  `user_image` varchar(500) not null,  `content` mediumtext not null,  `created_at` real not null,  key `idx_created_at` (`created_at`),  primary key (`id`)) engine=innodb default charset=utf8;