143 lines
5.3 KiB
Python
143 lines
5.3 KiB
Python
# dao/teacher_dao.py
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# 本文件封装对 tes_info 表的所有数据库操作（增、删、改、查）
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from sqlalchemy import or_
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from sqlalchemy.orm import Session
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from model.cls_mgmt_model import ClsMgmt
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from model.teacher_model import Teacher
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from scheme.teacher_scheme import TeacherUpdate, TeacherAdd
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import random
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class TeacherDao:
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"""教师数据访问对象，所有方法均为静态方法，方便调用"""
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#获取所有教师基本信息
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@staticmethod
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def get_all(db: Session, skip: int = 0, limit: int = 100) :
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"""
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获取所有用户（支持分页）
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:param db: 数据库会话
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:param skip: 偏移量（跳过前 skip 条）
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:param limit: 最大返回条数
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:return: 教师对象列表
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"""
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return db.query(Teacher).filter(Teacher.is_deleted == 0).offset(skip).limit(limit).all()
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#获取单个教师信息
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@staticmethod
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def get_by_id(db: Session, teacher_id: str) :
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"""
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根据主键 ID 获取单个教师信息
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:return:教师对象或 None
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"""
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return db.query(Teacher).filter(Teacher.id == teacher_id,Teacher.is_deleted == 0).first()
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@staticmethod
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def get_by_name(db: Session, teacher_name: str) :
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"""
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根据教师姓名获取信息（用于唯一性检查）
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"""
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return db.query(Teacher).filter(Teacher.name == teacher_name,Teacher.is_deleted == 0).first()
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# 根据教师id获取教师带教班级信息
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@staticmethod
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def get_clss_info(db: Session, teacher_id: str):
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"""
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根据主键 ID 获取单个教师信息
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:return: 带教信息或 None
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"""
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return db.query(ClsMgmt).filter(or_(ClsMgmt.head_tea_id == teacher_id,ClsMgmt.lecturer_id == teacher_id), ClsMgmt.is_deleted == 0).all()
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#添加教师
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@staticmethod
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def add(db: Session, teacher_data: TeacherAdd) :
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"""
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添加新教师
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:param db: 数据库会话
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:param teacher_data: 符合 TeacherAddUpdate 请求体模型的数据
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:return: 创建后的 teacher 对象（含id ）
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"""
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# 教师id自动生成 格式:T+随机四位数 并进行重复验证
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while True:
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new_id = f"T{random.randint(100, 999)}" # 确保是4位数，不会出现 0012 这种情况
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# 查询数据库是否已存在这个 id
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exists = db.query(Teacher).filter(Teacher.id == new_id).first()
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if not exists:
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break # 不存在，跳出循环，使用这个 id
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# 把传入的参数变成字典
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data_dict = teacher_data.model_dump()
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# 把生成id加到字典里
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data_dict["id"] = new_id
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#软删除逻辑is_delete默认为0
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data_dict["is_deleted"] = 0
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# 将 Pydantic 模型转为字典，并解包构建 SQLAlchemy 模型实例
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# 对字典进行拆包变成Teacher(id='',name='', phone='', type='',is_delete='0')
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db_teacher = Teacher(**data_dict)
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db.add(db_teacher) # 添加到会话
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db.commit() # 提交事务，此时会执行 INSERT，并自动填充自增字段
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db.refresh(db_teacher) # 刷新对象，获取数据库生成的默认值（如 created_at）
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return db_teacher
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#更新教师信息
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@staticmethod
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def update(db: Session, teacher_id: str, teacher_data: TeacherUpdate) :
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"""
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更新教师信息（只更新传入的非空字段）
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:param db: 数据库会话
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:param teacher_id: 要更新的教师 ID
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:param teacher_data: 包含要更新字段的 Pydantic 模型
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:return: 更新后的 Teacher 对象，如果没有此教师则返回None
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"""
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db_teacher = TeacherDao.get_by_id(db, teacher_id)
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if not db_teacher:
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return None
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# 只更新客户端显式传入的字段（exclude_unset=True 排除未设置的字段）
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# 不加 exclude_unset=True;teacher_data.model_dump() 会输出所有字段，没传的字段值是 None：
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# 将传入参数转变成字典
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update_data = teacher_data.model_dump(exclude_unset=True)
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#如果不传数据,直接返回本id教师
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if not update_data:
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return db_teacher
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#拆分遍历传入的数据
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for key, value in update_data.items():
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#滚动插入数据 动态赋值
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setattr(db_teacher, key, value)
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""""
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不使用setattr的写法
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if 'name' in update_data:
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db_teacher.name = update_data['name']
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if 'phone' in update_data:
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db_teacher.phone = update_data['phone']
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if 'type' in update_data:
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db_teacher.type = update_data['type']
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"""
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db.commit() # 提交事务
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db.refresh(db_teacher) # 刷新对象，获取 onupdate 时间等
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return db_teacher
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# 通过id删除教师
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@staticmethod
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def delete(db: Session, teacher_id: str):
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db_teacher = TeacherDao.get_by_id(db, teacher_id)
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#如果不存在返回None,供接口判断
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if not db_teacher:
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return None
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#存在的情况下,只需把is_delete改成1
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db_teacher.is_deleted = 1 #软删除,1代表已删除
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# db.delete(db_teacher) # 正常删除
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db.commit() # 提交事务
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db.refresh(db_teacher)
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return True |