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Asyncio strategy for SQLAlchemy.

Project description

PyPI Version Documentation Travis Coverage MIT License

sqlalchemy_aio adds asyncio support to SQLAlchemy core, derived from alchimia.

Getting started

import asyncio

from sqlalchemy_aio import ASYNCIO_STRATEGY

from sqlalchemy import (
    MetaData, Table, Column, Integer, String, create_engine, select)
from sqlalchemy.schema import CreateTable

async def main():
    engine = create_engine(
        'sqlite://', strategy=ASYNCIO_STRATEGY
    )

    metadata = MetaData()
    users = Table('users', metadata,
        Column('id', Integer(), primary_key=True),
        Column('name', String()),
    )

    # Create the table
    await engine.execute(CreateTable(users))

    conn = await engine.connect()

    # Insert some users
    await conn.execute(users.insert().values(name='Jeremy Goodwin'))
    await conn.execute(users.insert().values(name='Natalie Hurley'))
    await conn.execute(users.insert().values(name='Dan Rydell'))
    await conn.execute(users.insert().values(name='Casey McCall'))
    await conn.execute(users.insert().values(name='Dana Whitaker'))

    result = await conn.execute(users.select(users.c.name.startswith('D')))
    d_users = await result.fetchall()

    await conn.close()

    # Print out the users
    for user in d_users:
        print('Username: %s' % user[users.c.name])

    # Supports context async managers
    async with engine.connect() as conn:
        async with conn.begin() as trans:
            r = await conn.execute(select([1]))
            assert await r.fetchone() == (1,)

if __name__ == '__main__':
    loop = asyncio.get_event_loop()
    loop.run_until_complete(main())

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