Flask 如何在代码中往数据库插入数据

@staticmethod
def insert_roles():
roles = {
'User': (Permission.FOLLOW |
Permission.COMMENT |
Permission.WRITE_ARTICLES, True),
'Moderator': (Permission.FOLLOW |
Permission.COMMENT |
Permission.WRITE_ARTICLES |
Permission.MODERATE_COMMENTS, False),
'Administrator': (0xff, False)
}
for r in roles:
role = Role.query.filter_by(name=r).first()
if role is None:
role = Role(name=r)
role.permissions = roles[r][0]
role.default = roles[r][1]
db.session.add(role)
db.session.commit()

@manager.command
def insertdb():
from flask_migrate import upgrade
upgrade()
Role.insert_roles()