合并统计，学生，老师，成绩，班级模块，还差顾问，就业

model/wl_emp_model.py

@@ -1,18 +1,20 @@
 from sqlalchemy import *
 from sqlalchemy.orm import *
 
+from database import Base
+
 
 class Emp(Base):
     __tablename__ = "wl_emp"
 
-    stu_id = Column(Integer, primary_key=True, autoincrement=True)
-
+    stu_id = Column(Integer,ForeignKey('wl_student.stu_id'), primary_key=True, autoincrement=True)
     emp_open_time = Column(DateTime, default="2026-11-30 18:18:18")
     offer_time = Column(DateTime, default=func.now())
     company_name = Column(String(100), nullable=False)
     salary = Column(Integer, nullable=False, default=15000)
 
-    student = relationship("wl_student", back_populates="wl_emp")
+    # Student.emp 用的是 back_populates="student"，这个反向属性必须保留，否则 mapper 配置失败
+    student = relationship("Student", back_populates="emp")
 
     def __repr__(self):
         pass