一、模型
1、准备
from sqlalchemy import create_engine
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy import Column, Integer, String
from sqlalchemy.orm import sessionmaker
2、配置
db_url = 'mysql+pymysql://root:[email protected]:3306/tornado9'
# 创建引擎建立连接
engine = create_engine(db_url)
# 模型与数据库表关联的基类，模型必须继承于Base
Base = declarative_base(bind=engine)
# 创建session会话
DbSession = sessionmaker(bind=engine)
session = DbSession()
def create_db():
# 映射模型对应的表
Base.metadata.create_all()
def drop_db():
# 删除模型映射表
Base.metadata.drop_all()
class Student(Base):
id = Column(Integer, primary_key=True, autoincrement=True)
s_name = Column(String(10), unique=True, nullable=False)
s_age = Column(Integer, default=18)
__tablename__ = 'student'
3、使用
#增
stu = Student()
stu.s_name = 'xiaoming'
stus.append(stu)
session.add_all(stus)
session.commit()
#删
session.delete(stu)
session.commit()
#改
stu.s_name = 'xiaohua'
session.add(stu)
session.commit()
#查
#方法一：
stu = session.query(Student).filter(Student.s_name == 'xiaoming_1').first()
#方法二：
stus = session.query(Student).filter_by(s_name = 'xiaoming_0').all()
manage.py
import os
import tornado.web
import tornado.ioloop
from tornado.options import define, options, parse_command_line
from app.views import IndexHandler, XindexHandler, DbHandler, DropDbHandler, AddStuHandler, StusHandler
# 设置默认端口
define('port', default=80, type=int)
def make_app():
return tornado.web.Application(handlers=[
(r'/', IndexHandler),
(r'/xindex/', XindexHandler),
(r'/init_db/', DbHandler),
(r'/drop_db/', DropDbHandler),
(r'/add_stu/', AddStuHandler),
(r'/stus/', StusHandler)
],
# 指定参数表示文件在templates
template_path=os.path.join(os.path.dirname(os.path.abspath(__file__)), 'templates'),
static_path=os.path.join(os.path.dirname(os.path.abspath(__file__)), 'static'))
if __name__ == '__main__':
# 解析命令行
parse_command_line()
# 生成Application对象
app = make_app()
# 监听端口
app.listen(options.port)
# 启动
tornado.ioloop.IOLoop.current().start()
app/models.py
from sqlalchemy import Column, Integer, String
from utils.conn import Base
def create_db():
# 映射模型对应的表
Base.metadata.create_all()
def drop_db():
# 删除模型映射表
Base.metadata.drop_all()
class Student(Base):
id = Column(Integer, primary_key=True, autoincrement=True)
s_name = Column(String(10), unique=True, nullable=False)
s_age = Column(Integer, default=18)
__tablename__ = 'student'
utils/conn.py
from sqlalchemy import create_engine
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker
# 练级数据库格式
# mysql+pymysql://root:[email protected]:3306/tornado9
db_url = 'mysql+pymysql://root:[email protected]:3306/tornado9'
# 创建引擎建立连接
engine = create_engine(db_url)
# 模型与数据库表关联的基类，模型必须继承于Base
Base = declarative_base(bind=engine)
# 创建session会话
DbSession = sessionmaker(bind=engine)
session = DbSession()
app/views.py
from sqlalchemy import create_engine
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker
# 连接数据库格式
# mysql+pymysql://root:[email protected]:3306/tornado9
db_url = 'mysql+pymysql://root:[email protected]:3306/tornado9'
# 创建引擎建立连接
engine = create_engine(db_url)
# 模型与数据库表关联的基类，模型必须继承于Base
Base = declarative_base(bind=engine)
# 创建session会话
DbSession = sessionmaker(bind=engine)
session = DbSession()
二、HTTP行为方法
| 方法 | 说明 |
|---|---|
| GET | 用于获取数据 |
| POST | 用于创建数据 |
| PUT | 修改某个对象的全部属性 |
| PATCH | 修改某个对象的部分属性 |
| DELETE | 删除数据 |
三、模板
1、模板文件路径定义:Application(handlers=[], template_path='指定template文件夹的路径')
2、获取templates路径 os.patch.join(os.path.dirname(os.path.abspath(__file__)), 'templates')
3、挖坑 {% block name %} {% end %}注意：这里和Flask的jinja2有区别。
4、继承{% extends '父模板名称' %}
5、模板语法
{# 我是注释！ #}
{% block content %}
(｡◕ˇ∀ˇ◕)
{% for score in scores %}
{% if score > 60 %}
{{ score }}
{% elif score < 10 %}
{{ score }}
{% else %}
{{ score }}
{% end %}
{% end %}
{% while len(items) %}
{{ items.pop() }}
{% end %}
{% try %}
{{ item[10] }}
{% except %}
下标越界
{% finally %}
必须执行操作
{% end %}
{% set n=1 %}
{{ n }}
{% end %}