How Sanic connects to postgresql database
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1. Install System Pack
# yum install postgresql-devel
2. Install Python packages
peewee-2.8.5.tar.gz
psycopg2-2.6.2.tar.gz
1). Install 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). Install 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. directory structure
/home/webapp
|-- main.py
|-- my_blueprint.py
templates
|-- index.html
4. Document content:
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
id
name
{% for item in items %}
` item`.` id `
` item`.` name `
{% endfor %}
#
5. Browser Run Results
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