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from typing import Sequence, Optional, Union
from clickhouse_connect.driver import Client
class TableContext:
def __init__(self, client: Client,
table: str,
columns: Union[str, Sequence[str]],
column_types: Optional[Sequence[str]] = None,
engine: str = 'MergeTree',
order_by: str = None):
self.client = client
self.table = table
if isinstance(columns, str):
columns = columns.split(',')
if column_types is None:
self.column_names = []
self.column_types = []
for col in columns:
col = col.strip()
ix = col.find(' ')
self.column_types.append(col[ix + 1:].strip())
self.column_names.append(col[:ix].strip())
else:
self.column_names = columns
self.column_types = column_types
self.engine = engine
self.order_by = self.column_names[0] if order_by is None else order_by
def __enter__(self):
if self.client.min_version('19'):
self.client.command(f'DROP TABLE IF EXISTS {self.table}')
else:
self.client.command(f'DROP TABLE IF EXISTS {self.table} SYNC')
col_defs = ','.join(f'{name} {col_type}' for name, col_type in zip(self.column_names, self.column_types))
self.client.command(f'CREATE TABLE {self.table} ({col_defs}) ENGINE {self.engine} ORDER BY {self.order_by}')
return self
def __exit__(self, exc_type, exc_val, exc_tb):
self.client.command(f'DROP TABLE IF EXISTS {self.table}')
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