from sqlalchemy import  Column, Integer, String, Date
from sqlalchemy.orm import relationship
from database import Base
from model.teacher_class import teacher_class
from model.teacher import Teacher
from model.student import Student
# 导入中间关联表

# 班级信息表
class ClassInfo(Base):
    __tablename__="classinfo"
    id=Column(Integer,primary_key=True,autoincrement=True)
    class_name=Column(String(50),nullable=False,unique=True)
    start_time=Column(Date)
    statu=Column(Integer,default=1)  # 逻辑删除表字段 1代表存在
    teachers=relationship(Teacher,secondary=teacher_class,back_populates="classinfo")
    students= relationship(Student,back_populates="classinfo")