The actual operation command
1, python .py db init file
2, python xx.py db migrate -m 'version descriptor'
3,python xx.py db upgrade
4, python xx.py db history view the version number
5, python xx.py db downgrade (upgrade) version number
The actual operation command
1, python .py db init file
2, python xx.py db migrate -m 'version descriptor'
3,python xx.py db upgrade
4, python xx.py db history view the version number
5, python xx.py db downgrade (upgrade) version number