add sanic aiopg example with raw sql

examples/sanic_aiopg_example.py

@@ -0,0 +1,58 @@
+import os
+import asyncio
+import datetime
+
+import uvloop
+import aiopg
+
+from sanic import Sanic
+from sanic.response import json
+
+asyncio.set_event_loop_policy(uvloop.EventLoopPolicy())
+
+database_name = os.environ['DATABASE_NAME']
+database_host = os.environ['DATABASE_HOST']
+database_user = os.environ['DATABASE_USER']
+database_password = os.environ['DATABASE_PASSWORD']
+
+connection = 'postgres://{0}:{1}@{2}/{3}'.format(database_user, database_password, database_host, database_name)
+loop = asyncio.get_event_loop()
+
+
+async def get_pool():
+    return await aiopg.create_pool(connection)
+
+app = Sanic(name=__name__)
+pool = loop.run_until_complete(get_pool())
+
+
+async def prepare_db():
+    """ Let's create some table and add some data
+
+    """
+    async with pool.acquire() as conn:
+        async with conn.cursor() as cur:
+            await cur.execute("""CREATE TABLE sanic_poll (
+                                    id integer primary key,
+                                    question varchar(50),
+                                    pub_date timestamp
+                                );""")
+            for i in range(0, 100):
+                await cur.execute("""INSERT INTO sanic_poll (id, question, pub_date) VALUES ({}, {}, now())
+                """.format(i, i))
+
+
+@app.route("/")
+async def handle(request):
+    async with pool.acquire() as conn:
+        async with conn.cursor() as cur:
+            result = []
+            await cur.execute("SELECT question, pub_date FROM sanic_poll")
+            async for row in cur:
+                result.append({"question": row[0], "pub_date": row[1]})
+            return json({"polls": result})
+
+
+if __name__ == '__main__':
+    loop.run_until_complete(prepare_db())
+    app.run(host="0.0.0.0", port=8100, workers=3, loop=loop)