from sqlalchemy import Column, DateTime, ForeignKey, Integer, String
from sqlalchemy.orm import relationship

from database import Base


class Emp(Base):
    __tablename__ = "wl_emp"

    # 学号做主键，同时做外键指向学生表，长度跟 Student.stu_no 保持一致
    stu_no = Column(String(20), ForeignKey('wl_student.stu_no'), primary_key=True)
    emp_open_time = Column(DateTime)
    offer_time = Column(DateTime)
    company_name = Column(String(100), nullable=False)
    salary = Column(Integer, nullable=False, default=15000)

    student = relationship("Student", back_populates="emp")

    # 逻辑删除：0 正常 1 已删除
    is_deleted = Column(Integer, default=0, comment='逻辑删除: 0正常 1删除')

    def __repr__(self):
        return f"<Emp(stu_no={self.stu_no}, company='{self.company_name}')>"