add example for asyncpg

examples/sanic_asyncpg_example.py

@@ -0,0 +1,64 @@
+""" To run this example you need additional asyncpg package
+
+"""
+import os
+import asyncio
+
+import uvloop
+from asyncpg import create_pool
+import sqlalchemy as sa
+
+from sanic import Sanic
+from sanic.response import json
+
+asyncio.set_event_loop_policy(uvloop.EventLoopPolicy())
+
+DB_CONFIG = {
+    'host': 'localhost',
+    'user': 'tachien',
+    'database': 'tachien'
+}
+
+def jsonify(records):
+    """ Parse asyncpg record response into JSON format
+
+    """
+    return [{key: value for key, value in
+             zip(r.keys(), r.values())} for r in records]
+
+loop = asyncio.get_event_loop()
+
+async def make_pool():
+    return await create_pool(**DB_CONFIG)
+
+app = Sanic(__name__)
+pool = loop.run_until_complete(make_pool())
+
+async def create_db():
+    """ Create some table and add some data
+
+    """
+    async with pool.acquire() as connection:
+        async with connection.transaction():
+            await connection.execute('DROP TABLE IF EXISTS sanic_post')
+            await connection.execute("""CREATE TABLE sanic_post (
+                                    id serial primary key,
+                                    content varchar(50),
+                                    post_date timestamp
+                                );""")
+            for i in range(0, 100):
+                await connection.execute(f"""INSERT INTO sanic_post
+                    (id, content, post_date) VALUES ({i}, {i}, now())""")
+
+
+@app.route("/")
+async def handler(request):
+    async with pool.acquire() as connection:
+        async with connection.transaction():
+            results = await connection.fetch('SELECT * FROM sanic_post')
+            return json({'posts': jsonify(results)})
+
+
+if __name__ == '__main__':
+    loop.run_until_complete(create_db())
+    app.run(host='0.0.0.0', port=8000, loop=loop)