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dbcm.py
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dbcm.py
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"""Менеджер контекста базы данных."""
import pyodbc
from pyodbc import InterfaceError, OperationalError, ProgrammingError
class ConnectionErrorDB(Exception):
pass
class CredentialsErrorDB(Exception):
pass
class SQLError(Exception):
pass
pyodbc.pooling = False
class UseDatabase:
def __init__(self, config: str) -> None:
self.configuration = config
def __enter__(self) -> 'cursor':
try:
self.conn = pyodbc.connect(self.configuration, attrs_before={}, timeout=1)
self.cursor = self.conn.cursor()
return self.cursor
except OperationalError as err:
raise ConnectionErrorDB(err)
except InterfaceError as err:
raise ConnectionErrorDB(err)
except ProgrammingError as err:
raise CredentialsErrorDB(err)
def __exit__(self, exc_type, exc_val, exc_tb) -> None:
self.conn.commit()
self.cursor.close()
self.conn.close()
if exc_type is ProgrammingError:
raise SQLError(exc_val)
elif exc_type:
raise SQLError(exc_val)