database using SQLAlchemy's schema inspection capabilities, compare it to the current state of the database model as specified in Python, and generate a series of "candidate" migrations, rendering them into a new migration script as Python directives. The developer then edits the new file, ...
Alembic is a database migrations tool written by the author ofSQLAlchemy. A migrations tool offers the following functionality: Can emit ALTER statements to a database in order to change the structure of tables and other constructs Provides a system whereby "migration scripts" may be constructed;...
Flask-Migrate is an extension that handles SQLAlchemy database migrations for Flask applications using Alembic. The database operations are provided as command-line arguments under theflask dbcommand. Installation Install Flask-Migrate withpip:
app= Flask(__name__) app.config["SQLALCHEMY_DATABASE_URI"] ='mysql://username:password@hostname/database'#自动追踪,同步修改模型和数据库中的改动,建议设为False,降低内存消耗app.config[SQLALCHEMY_TRACK_MODIFICATIONS] =False#db是SQLAlchemy类的实例,表示应用使用的数据库db = SQLAlchemy(app) 定义模...
1.初始化,项目使用的时候,只敲一次,生成migrations文件夹 python manage.py db init 1. 2.记录变化,增加表,删除表,增加字段,删除字段都需要记录 python manage.py db migrate 1. 3.同步到数据库中 python manage.py db upgrade 1. 4.运行flask
database.py 数据库初始化(创建migrations文件夹) python database.py db init 数据库migrations python database.py db migrate -m "注释" 数据库migrate python database.py db upgrade 查询以前的版本 python database.py db history 回滚到指定版本 ...
config['SQLALCHEMY_DATABASE_URI'] = "mysql+pymysql://root:weiyigeek@localhost:3306/Flask_Hello" Step 4.项目环境决定数据库链接自定义配置 (1) 开发环境(Development):开发人员把代码拉取到本地环境中进行开发,等开发完成后推送到开发环境中(让项目的开发人员查看) (2) 测试环境(Testing):测试人员使用 ...
SQLALCHEMY_DATABASE_URI='数据库+数据库的驱动库://用户名:密码@主机ip:端口号/数据库名' 我们一般都在settings配置文件中配置数据库的连接路径,代码如下所示: class Config: ENV='development' #开发环境配置 DEBUG=True #调试模式为True # 配置连接数据库路径 ...
...在这一部分,我们将借助于SQLAlchemy使用Postgres数据库。...ORM时,需要执行迁移操作以便在模型和持久化数据之间保持同步。...Generating /Users/Vihar/Desktop/flask-databases/migrations/alembic.ini ... done 执行第一个迁移任务: $ python app.py
app.config['SQLALCHEMY_DATABASE_URI'] = "mssql+pyodbc:///?odbc_connect=%s" % params 然后这导致了一个额外的错误,因为我也在使用 Flask-Migrate 并且显然它不喜欢连接 URI 中的 % 。所以我做了更多的挖掘并找到了这篇文章。然后我在我的./migrations/env.py文件中更改了以下行 ...