はじめに

pip install clickhouse-connect

pip install "clickhouse-connect[async]"      # Native asyncio client
pip install "clickhouse-connect[pandas]"     # Pandas
pip install "clickhouse-connect[arrow]"      # PyArrow
pip install "clickhouse-connect[polars]"     # Polars
pip install "clickhouse-connect[sqlalchemy]" # SQLAlchemy dialect
pip install "clickhouse-connect[sqlalchemy-async]" # Async SQLAlchemy dialect
pip install "clickhouse-connect[alembic]"    # SQLAlchemy and Alembic
pip install "clickhouse-connect[chdb]"       # Embedded chDB backend
pip install "clickhouse-connect[rust,arrow]" # Experimental Rust codec evaluation setup
pip install "clickhouse-connect[tzdata]"     # IANA time zones on minimal systems

pip cache remove clickhouse_connect

python -c "from importlib.util import find_spec; print(all(find_spec(m) for m in ('clickhouse_connect.driverc.buffer', 'clickhouse_connect.driverc.dataconv', 'clickhouse_connect.driverc.npconv')))"

import clickhouse_connect

client = clickhouse_connect.get_client(
    host="localhost",
    username="default",
    password="password",
)

import clickhouse_connect

client = clickhouse_connect.get_client(
    host="HOSTNAME.clickhouse.cloud",
    port=8443,
    username="default",
    password="your password",
)

client.command(
    "CREATE TABLE new_table "
    "(key UInt32, value String, metric Float64) "
    "ENGINE MergeTree ORDER BY key"
)

row1 = [1000, "String Value 1000", 5.233]
row2 = [2000, "String Value 2000", -107.04]
data = [row1, row2]
client.insert("new_table", data, column_names=["key", "value", "metric"])

result = client.query("SELECT max(key), avg(metric) FROM new_table")
print(result.result_rows)
# Output: [(2000, -50.9035)]

client.close()

import clickhouse_connect

with clickhouse_connect.get_client(interface="chdb") as client:
    result = client.query("SELECT number FROM numbers(3)")
    print(result.result_rows)
    # Output: [(0,), (1,), (2,)]