ClickHouse SQLAlchemy
=====================
ClickHouse dialect for SQLAlchemy to `ClickHouse database <https://clickhouse.yandex/>`_.
.. image:: https://img.shields.io/pypi/v/clickhouse-sqlalchemy.svg
:target: https://pypi.org/project/clickhouse-sqlalchemy
.. image:: https://coveralls.io/repos/github/xzkostyan/clickhouse-sqlalchemy/badge.svg?branch=master
:target: https://coveralls.io/github/xzkostyan/clickhouse-sqlalchemy?branch=master
.. image:: https://img.shields.io/pypi/l/clickhouse-sqlalchemy.svg
:target: https://pypi.org/project/clickhouse-sqlalchemy
.. image:: https://img.shields.io/pypi/pyversions/clickhouse-sqlalchemy.svg
:target: https://pypi.org/project/clickhouse-sqlalchemy
.. image:: https://img.shields.io/pypi/dm/clickhouse-sqlalchemy.svg
:target: https://pypi.org/project/clickhouse-sqlalchemy
.. image:: https://github.com/xzkostyan/clickhouse-sqlalchemy/actions/workflows/actions.yml/badge.svg
:target: https://github.com/xzkostyan/clickhouse-sqlalchemy/actions/workflows/actions.yml
Documentation
=============
Documentation is available at https://clickhouse-sqlalchemy.readthedocs.io.
Usage
=====
Supported interfaces:
- **native** [recommended] (TCP) via `clickhouse-driver <https://github.com/mymarilyn/clickhouse-driver>`
- **async native** (TCP) via `asynch <https://github.com/long2ice/asynch>`
- **http** via requests
Define table
.. code-block:: python
from sqlalchemy import create_engine, Column, MetaData
from clickhouse_sqlalchemy import (
Table, make_session, get_declarative_base, types, engines
)
uri = 'clickhouse+native://localhost/default'
engine = create_engine(uri)
session = make_session(engine)
metadata = MetaData(bind=engine)
Base = get_declarative_base(metadata=metadata)
class Rate(Base):
day = Column(types.Date, primary_key=True)
value = Column(types.Int32)
__table_args__ = (
engines.Memory(),
)
Rate.__table__.create()
Insert some data
.. code-block:: python
from datetime import date, timedelta
from sqlalchemy import func
today = date.today()
rates = [
{'day': today - timedelta(i), 'value': 200 - i}
for i in range(100)
]
And query inserted data
.. code-block:: python
session.execute(Rate.__table__.insert(), rates)
session.query(func.count(Rate.day)) \
.filter(Rate.day > today - timedelta(20)) \
.scalar()
License
=======
ClickHouse SQLAlchemy is distributed under the `MIT license
<http://www.opensource.org/licenses/mit-license.php>`_.
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