aiomysql

aiomysql is a "driver" for accessing a MySQL database from the asyncio (PEP-3156/tulip) framework. It depends and reuses most parts of PyMySQL . aiomysql try to be like awesome aiopg library and preserve same api, look and feel.

Internally aiomysql is copy of PyMySQL, underlying io calls switched to async, basically yield from and asyncio.coroutine added in proper places)). sqlalchemy support ported from aiopg.

Basic Example

aiomysql based on PyMySQL , and provides same api, you just need to use yield from conn.f() instead of just call conn.f() for every method.

Properties are unchanged, so conn.prop is correct as well as conn.prop = val.

import asyncio
import aiomysql

loop = asyncio.get_event_loop()

@asyncio.coroutine
def test_example():
    conn = yield from aiomysql.connect(host='127.0.0.1', port=3306,
                                       user='root', passwd='', db='mysql',
                                       loop=loop)

    cur = yield from conn.cursor()
    yield from cur.execute("SELECT Host,User FROM user")
    print(cur.description)
    r = yield from cur.fetchall()
    print(r)
    yield from cur.close()
    conn.close()

loop.run_until_complete(test_example())

Connection Pool

Connection pooling ported from aiopg :

import asyncio
import aiomysql


loop = asyncio.get_event_loop()


@asyncio.coroutine
def test_example():
    pool = yield from aiomysql.create_pool(host='127.0.0.1', port=3306,
                                           user='root', passwd='',
                                           db='mysql', loop=loop)
    with (yield from pool) as conn:
        cur = yield from conn.cursor()
        yield from cur.execute("SELECT 10")
        # print(cur.description)
        (r,) = yield from cur.fetchone()
        assert r == 10
    pool.close()
    yield from pool.wait_closed()

loop.run_until_complete(test_example())

Example of SQLAlchemy optional integration

Sqlalchemy support has been ported from aiopg:

import asyncio
from aiomysql.sa import create_engine
import sqlalchemy as sa


metadata = sa.MetaData()

tbl = sa.Table('tbl', metadata,
    sa.Column('id', sa.Integer, primary_key=True),
    sa.Column('val', sa.String(255)))


@asyncio.coroutine
def go():
    engine = yield from create_engine(user='root',
                                      db='aiomysql',
                                      host='127.0.0.1',
                                      password='')

    with (yield from engine) as conn:
        yield from conn.execute(tbl.insert().values(val='abc'))

        res = yield from conn.execute(tbl.select())
        for row in res:
            print(row.id, row.val)


asyncio.get_event_loop().run_until_complete(go())

TODO

• implement ssl transport support
• rethink autocommit in tests
• documentation
• bring back loggers like in pymysql

Requirements

• Python 3.3+
• asyncio or Python 3.4+
• PyMySQL