Python廖雪峰实战web开发(day4-编写Model)
编写Model
结合上文编写完ORM,我们就可以把博客中需要用到的
Uers
,blogs
以及comments
各自的信息,存储到数据库的三个表中,并透过使用Model
表示出来。
编写代码如下:
#!usr/bin/env python
# -*- coding: utf-8 -*-
\'\'\'
创建model
\'\'\'
__author__=\'Seiei\'
import uuid,time
import asyncio
from web_app import orm
from web_app.orm import Model,StringField,IntegerField,BooleanField,TextField,FloatField
#from orm import Model,StringField,IntegerField,BooleanField,TextField,FloatField
def next_id():#随机生成id
return \'%015d%s000\'%(int(time.time()*1000),uuid.uuid4().hex)
class User(Model):
__table__ = \'users\'
id = StringField(primary_key=True, default=next_id, ddl=\'varchar(50)\')
email = StringField(ddl=\'varchar(50)\')
passwd = StringField(ddl=\'varchar(50)\')
admin = BooleanField()
name = StringField(ddl=\'varchar(50)\')
image = StringField(ddl=\'varchar(500)\')#注意由于是image,所以这里接受字节是500
create_at = FloatField(default=time.time)
class Blog(Model):
__table__ = \'blogs\'
id = StringField(primary_key=True, default=next_id,ddl=\'varchar(50)\')
user_id = StringField(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()
create_at = FloatField(default=time.time)
class Comment(Model):
__table__ = \'comments\'
id = StringField(primary_key=True, default=next_id, ddl=\'varchar(50)\')
blog_id = StringField(ddl=\'varchar(50)\')
user_id = StringField(ddl=\'varchar(50)\')
user_name = StringField(ddl=\'varchar(50)\')
user_image = StringField(ddl=\'varchar(500)\')
content = TextField()
create_at = FloatField(default=time.time)
if __name__== \'__main__\':
async def test():
await orm.create_pool(loop,user=\'www-data\', password=\'www-data\', db=\'awesome\')
u = User(name=\'Test\', email=\'test@example.com\', passwd=\'123456780\', image=\'about:blank\')
await u.save()
a = await u.findall() #这个要打印才显示出来
print(a)
loop = asyncio.get_event_loop()
loop.run_until_complete(test())
orm.__pool.close() #在关闭event loop之前,首先需要关闭连接池。
loop.run_until_complete(orm.__pool.wait_closed())#在关闭event loop之前,首先需要关闭连接池。
loop.close()
在编写完Model
代码后,我自行添加了数据访问代码,试着检测一下所写ORM
以及Model
是否有误。
但在此之前,得先初始化数据库表。
初始化数据库表
代码如下:
#!/usr/bin/env python3
# -*- coding: utf-8 -*-
__author__ = \'Seiei\'
import mysql.connector
conn = mysql.connector.connect(user=\'root\', password=\'password\', database=\'awesome\')#连接MySQL数据库中的awesome数据库
cursor = conn.cursor()#创建游标
cursor.execute(\'create table users (id varchar(50) primary key,email varchar(50),passwd varchar(50),name varchar(50),image varchar(500),admin boolean,create_at real)\')#创建users表-->表列都要定义名字及类型,主键后还要跟primary key
cursor.execute(\'create table blogs (id varchar(50) primary key,user_id varchar(50),user_name varchar(50),user_image varchar(500),name varchar(50),summary varchar(200),content text,create_at real)\')#创建blogs表
cursor.execute(\'create table comments (id varchar(50) primary key,blog_id varchar(50),user_id varchar(50),user_name varchar(50),user_image varchar(500),content text,create_at real)\')#创建comments表
cursor.close()
conn.commit()
conn.close()