Introduction to the usage of flask-migrate extension (with code)

This article brings you an introduction to the usage of the flask-migrate extension (with code). It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

flask-migrate is a falsk extension used for data migration. It is usually used in conjunction with flask-sqlalchemy. I also introduced this extension in the previous article. Friends who need it can read it. Later, I will write about flask-sqlalchemy in more depth.
【config.py】

SQLALCHEMY_DATABASE_URI='mysql://root:mysql@127.0.0.1:3306/test'    //数据库连接

SQLALCHEMY_TRACK_MODIFICATIONS=False

【data_migrate.py】

from flask import Flask
from flask_sqlalchemy import SQLAlchemy
from flask_script import Manager    #这是一个做脚本调式的库，有时间我也会总结
from flask_migrate import Migrate,MigrateCommand

app = Flask(__name__)

app.config.from_envvar('config.py')
db = SQLAlchemy(app) 

migrate = Migrate(app, db)

manager = Manager(app)
manager.add_command('db', MigrateCommand)

class User(db.Model):    #创建一个模型类，用于做数据迁移
    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String(32))
    
if __name__ == '__main__':
    manager.run()

【Console test】

>>>python data_migrate.py db init    //创建迁移存储库
>>>python data_migrate.py db migrate -m '版本名后缀'   //生成初始迁移
>>>python data_migrate.py db upgrade    //将迁移应用于数据库

//若有修改，可重复执行2/3这两条命令
>>>python 文件 db history    //显示整个历史版本记录
【其他命令】
python data_migrate.py db --help    //帮助，查找所有命令
python data_migrate.py db current    //显示当前版本
python data_migrate.py db upgrade 版本号    //升级版本,不指定版本为最新版本
python data_migrate.py db downgrade 版本号    //降级数据库,不指定版本则是最老版本

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