初始化前后端学生管理系统项目

model/Score.py

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+from sqlalchemy import  Column, Integer,ForeignKey
+from sqlalchemy.orm import relationship
+from sqlalchemy_fastapi_demo_1.database import Base
+
+
+# 成绩表表模型
+class Score(Base):
+    __tablename__ = 'score'
+    # 联合主键stu_id,exam_order
+    # 外键关联student
+    stu_id=Column(Integer,ForeignKey('student.stu_id'),primary_key=True)
+    # 声明关联student
+    student=relationship('Student',back_populates='score')
+    exam_id=Column(Integer,primary_key=True)
+    score=Column(Integer,nullable=False)
+
+
+

model/advisors.py

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+from datetime import datetime
+from sqlalchemy import Column, Integer, String, DateTime
+from sqlalchemy.orm import relationship
+
+from sqlalchemy_fastapi_demo_1.database import Base
+#创建顾问老师表模型。
+class Advisor(Base):
+    __tablename__ = 'advisor'
+    advisor_id = Column(Integer, primary_key=True,autoincrement=False)
+    advisor_name = Column(String(50),nullable=False)
+    #引入时间模块，得到创建时时间。特别注意这里，datetime点now不能有括号，有括号时，就在创建这个表类的时候，就锚定了时间。
+    #不写括号的话，就是当这个生成实例的时候，也就是具体往表里面注入内容的时候，才会生成一个对应的时间。
+    # 反向关系：Student.advisor 的对端（属性名必须是 students，与 Student.advisor 的 back_populates 一致）
+    students = relationship("Student", back_populates="advisor")

model/c_lass.py

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+
+
+from sqlalchemy import Column, Integer, Date #  导入"列"和字段类型（整数、日期）
+from sqlalchemy.orm import relationship #  导入"关系"函数，用来定义表间关联
+from sqlalchemy_fastapi_demo_1.database import Base #  导入database.py里的Base基类
+
+
+class Classinfo(Base):#  定义ORM模型类，继承Base，SQLAlchemy才知道它对应一张表
+    # 表名必须和建表语句一致：c_lass
+    __tablename__ = "c_lass"  #  指定表名，必须和MySQL里的表名一模一样，否则连不上表
+
+    class_id = Column(Integer, primary_key=True, index=True) #  主键列：整数类型；index=True表示建索引，按这个字段查会更快
+    start_time = Column(Date, nullable=False) #  开班日期：日期类型；nullable=False = 不能为空（数据库层面强制）
+    # 逻辑删除：0未删除，1已删除，默认0
+    is_deleted = Column(Integer, nullable=False, default=0)
+
+    # 反向关系：Student.my_class / Teacher.classes 的对端
+    students = relationship("Student", back_populates="my_class")
+    #  声明关系：一个班级下有很多学生（一对多）。"Student"是字符串，指向学生模型
+    #    back_populates="my_class"：和Student模型里的my_class属性互相呼应
+    teachers = relationship("Teacher", back_populates="classes")
+    #  同样：一个班级下有很多老师
+

model/employment.py

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+#导入创造引擎、定义类模块、数据类型模块、连接符模块
+from sqlalchemy import Column, Integer, String, Date, Float, ForeignKey
+#导入基类
+from sqlalchemy_fastapi_demo_1.database import Base
+#定义就业基础模块
+class EmploymentBase(Base):
+    __tablename__="employment_base"
+    stu_id=Column(Integer,ForeignKey("student.stu_id"),primary_key=True)
+    employment_open_time=Column(Date)
+    job_time=Column(Date)
+    company_name=Column(String(100))
+    salary=Column(Float)
+    is_deleted=Column(Integer,default=0)
+#定义就业协议模块
+class EmploymentOffer(Base):
+    __tablename__="employment_offer"
+    stu_id=Column(Integer,primary_key=True)
+    offer_id=Column(Integer,primary_key=True)
+    offer_time=Column(Date)
+    is_deleted=Column(Integer,default=0)

model/students.py

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+# model/users.py
+# 本文件定义 User 表的结构，映射到 MySQL 数据库
+
+from sqlalchemy import  Column, Integer, String, Float, ForeignKey,DateTime,Date
+from sqlalchemy.orm import declarative_base,relationship
+from sqlalchemy.sql import func
+from sqlalchemy_fastapi_demo_1.database import Base
+
+
+# model 类，对应 student表
+class Student(Base):
+    __tablename__ = "student"    #指定表名
+
+    stu_id = Column(Integer, primary_key = True)   #主键，学生编号
+    stu_name = Column(String(10),nullable = False)  #学生名字，非空约束
+    native_place = Column(String(30),nullable = False)      #籍贯，非空
+    graduate_school = Column(String(50),nullable = False)   #毕业院校
+    major = Column(String(20),nullable = False)   #专业
+    enroll_time = Column(Date, comment = "入学时间",nullable = False)
+    graduate_time = Column(Date, comment = "毕业时间",nullable = False)
+    education = Column(String(10),nullable = False)   #学历，非空
+    age = Column(Integer,nullable = False)    #年龄
+    gender = Column(String(10),nullable = False)  #性别
+    # employment_open_time = Column(Date,nullable = False)  #简历开放时间
+    # company_name = Column(String(100),nullable = False)   #公司名称
+    # salary = Column(Float,nullable = False)    #薪资
+    # # 逻辑删除标记
+    is_deleted = Column(Integer, nullable=False,default=0, comment="0正常；1逻辑删除")
+    # 外键：关联 C_lass 的 id
+    class_id = Column(Integer, ForeignKey("c_lass.class_id"), nullable=False)
+    # 关系属性：关联 Classinfo
+    my_class = relationship("Classinfo", back_populates="students")
+    # 外键：关联Advisor的id
+    advisor_id = Column(Integer,ForeignKey("advisor.advisor_id"),nullable=False)
+    # 关系属性：关联Advisor
+    advisor = relationship("Advisor", back_populates="students")
+    # 关系属性：关联成绩（Score.student 的对端）
+    score = relationship("Score", back_populates="student")
+
+
+

model/teachers.py

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+# 与数据库的表进行关联
+# 导入database文件,这里已经创建基类
+from sqlalchemy import Column, Integer, ForeignKey, String
+from sqlalchemy.orm import relationship
+from sqlalchemy_fastapi_demo_1.database import Base
+# 关联数据库中的teacher表
+class Teacher(Base):
+    __tablename__ = 'teacher'
+    teacher_id = Column(Integer, primary_key=True)
+    class_id = Column(Integer,ForeignKey('c_lass.class_id'),nullable=False)
+    teacher_name = Column(String(50),nullable=False)
+    job_name=Column(String(50),nullable=False,comment='主讲、班主任、助教')
+    is_deleted = Column(Integer, default=0, nullable=False)
+    classes=relationship("Classinfo",back_populates="teachers")
+    def __repr__(self):
+        return f"<Teacher(teacher_id={self.teacher_id},class_id={self.class_id},teacher_name='{self.teacher_name}',job_name='{self.job_name}')>"