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clickhouse-sqlalchemy
Advanced tools
ClickHouse dialect for SQLAlchemy to ClickHouse database <https://clickhouse.yandex/>
_.
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Documentation is available at https://clickhouse-sqlalchemy.readthedocs.io.
Supported interfaces:
clickhouse-driver <https://github.com/mymarilyn/clickhouse-driver>
asynch <https://github.com/long2ice/asynch>
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()
ClickHouse SQLAlchemy is distributed under the MIT license <http://www.opensource.org/licenses/mit-license.php>
_.
FAQs
Simple ClickHouse SQLAlchemy Dialect
We found that clickhouse-sqlalchemy demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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