Generally a object-relational database like postgres is advised for production environments where you expect many concurrent queries. Sqlite is nice and lightweight for use in development but isn't necessarily desirable to use in production. LOG_TO_STDOUT = os.environ.get('LOG_TO_STDOUT')įrom flask import Flask, request, current_appįrom flask_appbuilder import AppBuilder, SQLAįrom logging.handlers import SMTPHandler, RotatingFileHandlerĪppbuilder = AppBuilder(app, db.session, indexview=MyIndexView, base_template='mybase.html')įile_handler = RotatingFileHandler('logs/microblog.log',įile_tFormatter(logging.Michael West 03-11-2019 Migrate your Flask SQLite DB to Postgres IMG_UPLOAD_FOLDER = basedir + "/app/static/uploads/" UPLOAD_FOLDER = basedir + "/app/static/uploads/" #SQLALCHEMY_DATABASE_URI = "sqlite:///" + os.path.join(basedir, "app.db") SQLALCHEMY_DATABASE_URI = os.environ.get('DATABASE_URL') or "sqlite:///" + os.path.join(basedir, "app.db") Load_dotenv(os.path.join(basedir, '.env')) T16:01:19.958297+00:00 heroku: State changed from up to crashed Error converting sqllite database to postgresql database when deploying Flask app on Heroku Ask Question Asked 3 years, 3 months ago Modified 3 years, 3 months ago Viewed 436 times 0 My flask app deployed with Heroku crashes when I change the database to postgresql from sqllite. Once you have changes on your entities (data classes) in your code base, you crate the related migration and commit/push the code. T16:01:19.714006+00:00 app: LINE 1: PRAGMA foreign_keys=ON First, you need to keep data structure up-to-date among your team. T16:01:19.714006+00:00 app: : (圎rror) syntax error at or near "PRAGMA" To use SqlAlchemy ORM a few simple steps must be followed: Import the library in the file that bootstrap our simple app, provide the minimal required configuration and bind the SqlAlchemy Object to the 'app' object. T16:01:19.714005+00:00 app: File "/app/app/_init_.py", line 47, in set_sqlite_pragma admin (username'admin').first () admin.email '' db.mit () user (5) user.name 'New Name' db.mit () Flask-SQLAlchemy is based on SQLAlchemy, so be sure to check out the SQLAlchemy Docs as well. Was the direct cause of the following exception: It provides an SQL interface compliant with the DB-API 2.0 specification described by PEP 249, and requires SQLite 3.7.15 or newer. The sqlite3 module was written by Gerhard Hring. T15:54:29.068485+00:00 app: The above exception It’s also possible to prototype an application using SQLite and then port the code to a larger database such as PostgreSQL or Oracle. Now when I deploy to Heroku I get an error. ![]() I changed my DATABASE_URI to: SQLALCHEMY_DATABASE_URI = os.environ.get('DATABASE_URL') or "sqlite:///" + os.path.join(basedir, "app.db") I added postgresql to Heroku, and verified the url existed by running os.environ.get('DATABASE_URL') in the Heroku Python terminal. ![]() That said, there are cases where you do need to make changes to the data stored in your database as part of a migration. In general the contents of the database do not need to change and in particular a full data dump shouldn't be necessary. But because of Heroku's ephemeral file system I must change my db from sqlite to postgresql. The main purpose of Flask-Migrate and Alembic is to manage the database schema migration history. I deployed it to Heroku successfully with no errors. Originally my DATABASE_URI in my config file was as follows: SQLALCHEMY_DATABASE_URI = "sqlite:///" + os.path.join(basedir, "app.db") Note that some of those cannot be modified after the engine was created so make sure to configure as early as possible and to not modify them at runtime. Flask-SQLAlchemy loads these values from your main Flask config which can be populated in various ways. I set up my flask application using a SQL Lite database for local development. Configuration The following configuration values exist for Flask-SQLAlchemy. My flask app deployed with Heroku crashes when I change the database to postgresql from sqllite.
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