python sanic_Sanic 连接postgresql数据库

1.安装系统包

# yum install postgresql-devel

2.安装Python包

peewee-2.8.5.tar.gz

psycopg2-2.6.2.tar.gz

1).安装peewee-async

# pip install peewee-async

Collecting peewee-async

Downloading peewee_async-0.5.6-py3-none-any.whl

Requirement already satisfied: peewee>=2.8.0 in /usr/local/lib/python3.5/site-packages (from peewee-async)

Installing collected packages: peewee-async

Successfully installed peewee-async-0.5.6

#

2).安装aiopg

# pip install aiopg

Collecting aiopg

Using cached aiopg-0.13.0-py3-none-any.whl

Requirement already satisfied: psycopg2>=2.5.2 in /usr/local/lib/python3.5/site-packages/psycopg2-2.6.2-py3.5-linux-x86_64.egg (from aiopg)

Installing collected packages: aiopg

Successfully installed aiopg-0.13.0

#

3.目录结构

/home/webapp

|-- main.py

|-- my_blueprint.py

templates

|-- index.html

4.文件内容：

1).main.py

# more main.py

from sanic import Sanic

from my_blueprint import bp

app = Sanic(__name__)

app.blueprint(bp)

app.run(host='0.0.0.0', port=8000, debug=True)

#

2).my_blueprint.py

# more my_blueprint.py

from sanic import Blueprint

from sanic.response import json, text, html

## Jinja2 template ####

from jinja2 import Environment, PackageLoader

env = Environment(loader=PackageLoader('my_blueprint', 'templates'))

## database ####

import uvloop, peewee

from peewee_async import PostgresqlDatabase

bp = Blueprint('my_blueprint')

# init db connection

global database

database = PostgresqlDatabase(database='webdb',

host='127.0.0.1',

user='postgres',

password='111111')

# router define

@bp.route('/')

async def bp_root(request):

serialized_obj = []

cursor = database.execute_sql('select * from t1;')

for row in cursor.fetchall():

serialized_obj.append({

'id': row[0],

'name': row[1]}

)

template = env.get_template('index.html')

content=template.render(items=serialized_obj)

return html(content)

#

3).index.html

# more index.html

Sanic

#

5.浏览器运行结果