aiomysql is a library for accessing a MySQL database from the asyncio
terrycain Merge pull request #339 from TimothyFitz/conn-pool-check-exception
Don't reuse connections when StreamReader has an exception
Latest commit e81f356 Sep 17, 2018


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aiomysql is a "driver" for accessing a MySQL database from the asyncio (PEP-3156/tulip) framework. It depends on and reuses most parts of PyMySQL . aiomysql tries 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.


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Basic Example

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

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

import asyncio
from aiomysql import create_pool

loop = asyncio.get_event_loop()

async def go():
    async with create_pool(host='', port=3306,
                           user='root', password='',
                           db='mysql', loop=loop) as pool:
        async with pool.get() as conn:
            async with conn.cursor() as cur:
                await cur.execute("SELECT 42;")
                value = await cur.fetchone()


Connection Pool

Connection pooling ported from aiopg :

import asyncio
import aiomysql

async def test_example(loop):
    pool = await aiomysql.create_pool(host='', port=3306,
                                      user='root', password='',
                                      db='mysql', loop=loop)
    async with pool.acquire() as conn:
        async with conn.cursor() as cur:
            await cur.execute("SELECT 42;")
            (r,) = await cur.fetchone()
            assert r == 42
    await pool.wait_closed()

loop = asyncio.get_event_loop()

Example of SQLAlchemy optional integration

Sqlalchemy support has been ported from aiopg so api should be very familiar for aiopg user.:

import asyncio
import sqlalchemy as sa

from import create_engine

metadata = sa.MetaData()

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

async def go(loop):
    engine = await create_engine(user='root', db='test_pymysql',
                                 host='', password='', loop=loop)
    async with engine.acquire() as conn:
        await conn.execute(tbl.insert().values(val='abc'))
        await conn.execute(tbl.insert().values(val='xyz'))

        async for row in conn.execute(
            print(, row.val)

    await engine.wait_closed()

loop = asyncio.get_event_loop()