clickhouse-driver

ClickHouse Python Driver

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ClickHouse Python Driver with native (TCP) interface support.

Asynchronous wrapper is available here: https://github.com/mymarilyn/aioch

Features

• External data for query processing.

• Query settings.

• Compression support.

• TLS support.

• Types support:

  • Float32/64
  • [U]Int8/16/32/64/128/256
  • Date/Date32/DateTime('timezone')/DateTime64('timezone')
  • String/FixedString(N)
  • Enum8/16
  • Array(T)
  • Nullable(T)
  • Bool
  • UUID
  • Decimal
  • IPv4/IPv6
  • LowCardinality(T)
  • SimpleAggregateFunction(F, T)
  • Tuple(T1, T2, ...)
  • Nested
  • Map(key, value)

• Query progress information.

• Block by block results streaming.

• Reading query profile info.

• Receiving server logs.

• Multiple hosts support.

• Python DB API 2.0 specification support.

• Optional NumPy arrays support.

Documentation

Documentation is available at https://clickhouse-driver.readthedocs.io.

Usage

There are two ways to communicate with server:

• using pure Client;
• using DB API.

Pure Client example:

.. code-block:: python

    >>> from clickhouse_driver import Client
    >>>
    >>> client = Client('localhost')
    >>>
    >>> client.execute('SHOW TABLES')
    [('test',)]
    >>> client.execute('DROP TABLE IF EXISTS test')
    []
    >>> client.execute('CREATE TABLE test (x Int32) ENGINE = Memory')
    []
    >>> client.execute(
    ...     'INSERT INTO test (x) VALUES',
    ...     [{'x': 100}]
    ... )
    1
    >>> client.execute('INSERT INTO test (x) VALUES', [[200]])
    1
    >>> client.execute(
    ...     'INSERT INTO test (x) '
    ...     'SELECT * FROM system.numbers LIMIT %(limit)s',
    ...     {'limit': 3}
    ... )
    []
    >>> client.execute('SELECT sum(x) FROM test')
    [(303,)]

DB API example:

.. code-block:: python

    >>> from clickhouse_driver import connect
    >>>
    >>> conn = connect('clickhouse://localhost')
    >>> cursor = conn.cursor()
    >>>
    >>> cursor.execute('SHOW TABLES')
    >>> cursor.fetchall()
    [('test',)]
    >>> cursor.execute('DROP TABLE IF EXISTS test')
    >>> cursor.fetchall()
    []
    >>> cursor.execute('CREATE TABLE test (x Int32) ENGINE = Memory')
    >>> cursor.fetchall()
    []
    >>> cursor.executemany(
    ...     'INSERT INTO test (x) VALUES',
    ...     [{'x': 100}]
    ... )
    >>> cursor.rowcount
    1
    >>> cursor.executemany('INSERT INTO test (x) VALUES', [[200]])
    >>> cursor.rowcount
    1
    >>> cursor.execute(
    ...     'INSERT INTO test (x) '
    ...     'SELECT * FROM system.numbers LIMIT %(limit)s',
    ...     {'limit': 3}
    ... )
    >>> cursor.rowcount
    0
    >>> cursor.execute('SELECT sum(x) FROM test')
    >>> cursor.fetchall()
    [(303,)]

License

ClickHouse Python Driver is distributed under the MIT license <http://www.opensource.org/licenses/mit-license.php>_.