bardo-copyright-db/sessionManager.py

57 lines
1.7 KiB
Python

import os
from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker
from model.core import Base
class SessionManager():
def __init__(self, user=None, pswd=None, host=None, port=None, db=None):
self.user = user if user else os.environ.get('DB_USER', None)
self.pswd = pswd if pswd else os.environ.get('DB_PSWD', None)
self.host = host if host else os.environ.get('DB_HOST', None)
self.port = port if port else os.environ.get('DB_PORT', None)
self.db = db if db else os.environ.get('DB_NAME', None)
self.engine = None
self.session = None
def generateEngine(self):
try:
self.engine = create_engine(
'postgresql://{}:{}@{}:{}/{}'.format(
self.user,
self.pswd,
self.host,
self.port,
self.db
)
)
except Exception as e:
raise e
def initializeDatabase(self, reinit=False):
if reinit: Base.metadata.drop_all(self.engine, checkfirst=True)
if not self.engine.dialect.has_table(self.engine, 'cce'):
Base.metadata.create_all(self.engine)
def createSession(self, autoflush=True):
if not self.engine: self.generateEngine()
self.session = sessionmaker(
bind=self.engine,
autoflush=autoflush
)()
return self.session
def startSession(self):
self.session.begin_nested()
def commitChanges(self):
self.session.commit()
def rollbackChanges(self):
self.session.rollback()
def closeConnection(self):
self.commitChanges()
self.session.close()
self.engine.dispose()