Hello everyone!
I have Flask app with using flask_sqlalchemy:
from flask import Flask
from flask_sqlalchemy import SQLAlchemy
app = Flask(__name__)
app.config.from_pyfile(filename='settings.py', silent=True)
db = SQLAlchemy(app=app)
I want connect to same database from daemon. In daemon i just import db and
use db.engine.execute for SQLAlchemy queries.
But when daemon starts main app can't connect to database.
In log i see that:
fdb.fbcore.DatabaseError: ('Error while connecting to database:\n- SQLCODE:
-902\n- I/O error during "lock" operation for file "main.fdb"\n- Database
already opened with engine instance, incompatible with current', -902,
335544344)
I trying use isolation level:
from fdb.fbcore import ISOLATION_LEVEL_READ_COMMITED_LEGACY
class TPBAlchemy(SQLAlchemy):
def apply_driver_hacks(self, app_, info, options):
if 'isolation_level' not in options:
options['isolation_level'] =
ISOLATION_LEVEL_READ_COMMITED_LEGACY
return super(TPBAlchemy, self).apply_driver_hacks(app_, info,
options)
And replace this:
db = SQLAlchemy()
To:
db = TPBAlchemy()
But this only make another error:
TypeError: Invalid argument(s) 'isolation_level' sent to create_engine(),
using configuration FBDialect_fdb/QueuePool/Engine. Please check that the
keyword arguments are appropriate for this combination of components.
I would appreciate the full example to address my issue.
Thanks!
--
SQLAlchemy -
The Python SQL Toolkit and Object Relational Mapper
http://www.sqlalchemy.org/
To post example code, please provide an MCVE: Minimal, Complete, and Verifiable
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