sqlalchemy 相关

from sqlalchemy.ext.declarative import declarative_base
Base = declarative_base()
class User(Base):
    """
    Eventually should be used for security purposes
    """
    __tablename__ = "user"
    id = Column(Integer, primary_key=True)
    username = Column(String(ID_LEN), unique=True)
    email = Column(String(500))

    def __init__(self, username=None, email=None):
        self.username = username
        self.email = email

Base.metadata.create_all(settings.engine)
declarative_base() 创建了一个 BaseModel 类，这个类的子类可以自动与一个表关联
BaseModel.metadata.create_all(engine) 会找到 BaseModel 的所有子类，并在数据库中建立这些表；drop_all() 则是删除这些表。