Python编程：Flask扩展Flask-Migrate迁移数据库

pip install  Flask-Migrate

pip install Flask-Script Flask-SQLAlchemy

from flask import Flask
from flask_sqlalchemy import SQLAlchemy
from flask_script import Manager
from flask_migrate import Migrate, MigrateCommand
app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///app.db'
db = SQLAlchemy(app)
migrate = Migrate(app, db)
manager = Manager(app)
manager.add_command('db', MigrateCommand)
class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String(128))
if __name__ == '__main__':
    manager.run()

# 1、初始化
python main.py db init
# 2、生成迁移文件
python main.py db migrate -m "备注信息"
# 3、执行升级
python main.py db upgrade
# 4、查看历史记录
python main.py db history
# 5、执行降级
python main.py db downgrade <版本号>

brew install pandoc
OSError: No pandoc was found