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Alternative Flask SQLAlchemy extension
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from sqlalchemy.engine import create_engine | |
from sqlalchemy.orm.scoping import scoped_session | |
from sqlalchemy.orm.session import sessionmaker | |
class SQLAlchemy: | |
def __init__(self, app=None): | |
if app is not None: | |
self.init_app(app) | |
def init_app(self, app): | |
if not hasattr(app, 'extensions'): | |
app.extensions = {} | |
app.extensions['sqlalchemy'] = self | |
pool_size = app.config.get('SQLALCHEMY_POOL_SIZE', 5) | |
max_overflow = app.config.get('SQLALCHEMY_MAX_OVERFLOW', 15) | |
self.engine = create_engine(app.config['SQLALCHEMY_URL'], pool_size=pool_size, max_overflow=max_overflow) | |
self.session = scoped_session(sessionmaker(self.engine)) | |
app.teardown_appcontext(self.close_session) | |
def close_session(self, response_or_exc): | |
try: | |
if response_or_exc is None and self.session.is_active: | |
self.session.commit() | |
finally: | |
self.session.remove() | |
return response_or_exc |
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