Question

我从另一台计算机上恢复了一个Flask应用程序，我想在我的macbook pro上使用mysql。我正在运行python3.6和最新的烧瓶版本

应用/ __初始化__。PY

from flask import Flask
from flask_sqlalchemy import SQLAlchemy

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

from app import views

models.py

from app import db


class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    nickname = db.Column(db.String(64), index=True, unique=True)
    email = db.Column(db.String(120), index=True, unique=True)
    posts = db.relationship('Post', backref='author', lazy='dynamic')

    def __repr__(self):
        return '<User %r>' % (self.nickname)


class Post(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    body = db.Column(db.String(140))
    timestamp = db.Column(db.DateTime)
    user_id = db.Column(db.Integer, db.ForeignKey('user.id'))

    def __repr__(self):
        return '<Post %r>' % (self.body)

config.py

import os
basedir = os.path.abspath(os.path.dirname(__file__))

WTF_CSRF_ENABLED = True
SECRET_KEY = '8ccfeba0c5602070a243fc343e62258501789c52a0ced099'

SQLALCHEMY_DATABASE_URI = 'mysql://root:@localhost/microblog'
SQLALCHEMY_MIGRATE_REPO = os.path.join(basedir, 'db_repository')
SQLALCHEMY_TRACK_MODIFICATIONS = True

首先我创建了数据库：

CREATE DATABASE mydatabase CHARACTER SET utf8 COLLATE utf8_general_ci;

接下来，我使用https://blog.miguelgrinberg.com/post/the-flask-mega-tutorial-part-iv-database中的脚本来创建数据库并运行迁移。

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))

db_migrate.py

import imp
from migrate.versioning import api
from app import db
from config import SQLALCHEMY_DATABASE_URI
from config import SQLALCHEMY_MIGRATE_REPO
v = api.db_version(SQLALCHEMY_DATABASE_URI, SQLALCHEMY_MIGRATE_REPO)
migration = SQLALCHEMY_MIGRATE_REPO + ('/versions/%03d_migration.py' % (v+1))
tmp_module = imp.new_module('old_model')
old_model = api.create_model(SQLALCHEMY_DATABASE_URI, SQLALCHEMY_MIGRATE_REPO)
exec(old_model, tmp_module.__dict__)
script = api.make_update_script_for_model(SQLALCHEMY_DATABASE_URI, SQLALCHEMY_MIGRATE_REPO, tmp_module.meta, db.metadata)
open(migration, "wt").write(script)
api.upgrade(SQLALCHEMY_DATABASE_URI, SQLALCHEMY_MIGRATE_REPO)
v = api.db_version(SQLALCHEMY_DATABASE_URI, SQLALCHEMY_MIGRATE_REPO)
print('New migration saved as ' + migration)
print('Current database version: ' + str(v))

所以我跑

python3 db_create.py

和

python3 db_migrate.py

一切正常，没有错误。

接下来我打开一个终端运行：

from app import db, models
users = models.User.query.all()

我收到了这个错误：

ProgrammingError: (_mysql_exceptions.ProgrammingError) (1146, "Table 'microblog.user' doesn't exist") [SQL: 'SELECT user.id AS user_id, user.nickname AS user_nickname, user.email AS user_email \nFROM user']

但是我创建了数据库并使用我的最后两个脚本运行了迁移。任何的想法？感谢

Flask：使用mysql和sqlalchemy编程错误

0 个答案: