如何在Flask中将SQLAlchemy-Migrate与MySQL数据库一起使用

Question

I've been working on replacing my SQLite database with a MySQL database in my Flask app.

Previously I've been using scripts from the Mega Flask Tutorial to manage my database creation and migration using SQLAlchemy-Migrate.

It seems that these scripts are not compatible with MySQL out of the box, and I can't really find anything on how to use SQLAlchemy-Migrate with MySQL.

How do you guys typically handle changes to your models and database migrations when in development with MySQL?

#Config
SQLALCHEMY_DATABASE_URI = 'mysql+pymysql://root:tehnoose@localhost/app'
SQLALCHEMY_MIGRATE_REPO = os.path.join(basedir, 'db_repository')

#db_create.py
from migrate.versioning import api
from config import SQLALCHEMY_DATABASE_URI
from config import SQLALCHEMY_MIGRATE_REPO
from app import db
import os.path
db.create_all()
if not os.path.exists(SQLALCHEMY_MIGRATE_REPO):
    api.create(SQLALCHEMY_MIGRATE_REPO, 'database repository')
    api.version_control(SQLALCHEMY_DATABASE_URI, SQLALCHEMY_MIGRATE_REPO)
else:
    api.version_control(SQLALCHEMY_DATABASE_URI, SQLALCHEMY_MIGRATE_REPO, api.version(SQLALCHEMY_MIGRATE_REPO))

#Traceback

    Traceback (most recent call last):
  File "db_create.py", line 12, in <module>
    api.version_control(SQLALCHEMY_DATABASE_URI, SQLALCHEMY_MIGRATE_REPO, api.ve
rsion(SQLALCHEMY_MIGRATE_REPO))
  File "C:\pyprojects\cc\flask\lib\site-packages\migrate\versioning\api.py", lin
e 133, in version
    repo = Repository(repository)
  File "C:\pyprojects\cc\flask\lib\site-packages\migrate\versioning\repository.p
y", line 77, in __init__
    self.verify(path)
  File "C:\pyprojects\cc\flask\lib\site-packages\migrate\versioning\repository.p
y", line 98, in verify
    raise exceptions.InvalidRepositoryError(path)
migrate.exceptions.InvalidRepositoryError: C:\pyprojects\cc\db_repository

Answer 1

I got exactly the same situation today, finally I found they're compatible perfectly. Just create a new database in mysql and reset SQLALCHEMY_DATABASE_URI before you run the scripts.