from sqlalchemy import *
from datetime import datetime
from database import Base
class Class(Base):
    '''
    班级信息数据库类模型
    '''
    __tablename__ = "s_class"
    id = Column(Integer,
                primary_key=True,
                autoincrement=True,
                index=True,#为该列创建索引，加快查询速度
                comment='班级主键id')
    class_id = Column(String(32),
                      nullable=False,
                      index=True,
                      unique=True,
                      comment='班级编号')
    class_name = Column(String(32),
                        nullable=False,
                        index=True,
                        comment='班级名字')
    ht_id = Column(Integer,nullable=False,
                            comment='班主任ID')
    t_id = Column(Integer,nullable=False,
                             comment='授课老师ID')
    start_time = Column(DATETIME,default=datetime.now,comment='开课时间')
    update_time = Column(DATETIME,default=datetime.now,onupdate=datetime.now)
    is_deleted = Column(Integer,default=0,index=True)