Merge pull request '南方宇' (#15) from 南方宇 into main

Reviewed-on: #15

models/employment.py

@@ -0,0 +1,40 @@
+from sqlalchemy import *
+from sqlalchemy.orm import declarative_base,sessionmaker
+from datetime import datetime
+from core.database import Base, engine
+
+# 为了符合三范式，就业表只保存 student_id，不保存学生姓名和班级名称。查询返回时通过关联 students 和 classes 带出学生姓名、班级名称。
+
+class Employment(Base):
+    __tablename__ = "employments"                              # 实际数据库的表名字
+    id = Column(BigInteger, primary_key=True                   # 主键
+                , autoincrement=True                           # 声明是自增主键
+                ,comment="就业信息主键id")
+    student_id = Column(BigInteger, ForeignKey("students.id")  # 外键 -> students.id
+                        , nullable=False                       # 不允许为null
+                        ,comment="关联学生id")
+    employment_status = Column(String(50)
+                               , default="not_started"
+                               ,comment="就业状态:not_started/job_hunting/offered/employed")
+    employment_open_date = Column(Date
+                                  ,comment="就业开放时间")
+    offer_date = Column(Date
+                        ,comment="offer下发时间")
+    company_name = Column(String(100)
+                          , comment="就业公司名称")
+    salary = Column(DECIMAL(10, 2)                      # 高精度浮点数薪资,最多 10 位数字，小数占 2 位
+                    , comment="就业薪资")
+    remark = Column(String(255)
+                    ,default=None
+                    , comment="备注信息")
+    created_at = Column(DateTime
+                        , default=datetime.now
+                        , comment="创建时间")
+    updated_at = Column(DateTime
+                        , default=datetime.now
+                        , onupdate=datetime.now
+                        ,comment="更新时间")
+    is_deleted = Column(SmallInteger
+                        ,default=0
+                        ,comment="逻辑删除：0正常，1删除")
+