Create database table db.create in flask project_ all()

Flask The project needs to be deployed according to database Create data tables by using the model classes defined in . Directly in database.py Write in db.create_all() It doesn't work , Report errors ：

...
 from app import db, logger
ModuleNotFoundError: No module named 'app'

to update ： Need to be in py Add... To the document

import os
import sys

sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), '..')))

So you can find the path
Search for a long time without success in a separate file （database.py） In the implementation of db.create_all(), So first __init__.py Write the created statement , Be careful to write it at the end import database It only works after .

from flask import Flask
from config import Config
from flask_sqlalchemy import SQLAlchemy

app = Flask(__name__)
app.config.from_object(Config)
db = SQLAlchemy(app)

from app import database
db.create_all()

Comment this out after creating it .