117 lines
3.1 KiB
Python
117 lines
3.1 KiB
Python
from models.student import Student
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from sqlalchemy.orm import Session
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#新建学生
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def create_students(d: dict, db: Session):
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stu = Student(**d)
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try:
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db.add(stu)
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# 把 SQL 发给数据库执行
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db.flush()
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# 根据 id 生成学生编号
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if not stu.student_no:
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stu.student_no = f"STU{stu.id:04d}"
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db.commit()
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db.refresh(stu)
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return stu
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except Exception as e:
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db.rollback()
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print(f"插入学生失败: {e}")
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return None
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#查询学生是否已经被逻辑删除
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def get_student_by_id(student_id: int, db: Session):
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# 同时判断 is_deleted，已经逻辑删除的学生不会被查到
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return db.query(Student).filter(
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Student.id == student_id,
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Student.is_deleted == 0,
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).first()
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#更新学生信息
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def update_student(student_id: int, data: dict, db: Session):
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# 第一步：先查询学生
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student = get_student_by_id(student_id, db)
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# 没有查到就返回 None
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if not student:
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return None
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try:
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# 第二步：循环修改前端传来的字段
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# field 是字段名，value 是新的值
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for field, value in data.items():
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setattr(student, field, value)
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# 第三步：提交修改并重新读取数据
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db.commit()
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db.refresh(student)
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return student
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except Exception as e:
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# 修改失败时回滚
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db.rollback()
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print("修改学生失败：", e)
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return False
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#允许条件输入的列表查询
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def get_students(
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db: Session,
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student_no: str | None = None,
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student_name: str | None = None,
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class_id: int | None = None,
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page: int = 1,
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page_size: int = 10,
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):
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# 第一步：只查询没有被删除的学生
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query = db.query(Student).filter(Student.is_deleted == 0)
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# 第二步：前端传了哪个条件，就增加哪个条件
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if student_no:
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# 学号使用精确查询
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query = query.filter(Student.student_no == student_no)
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if student_name:
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# 姓名使用模糊查询，例如“张”可以查到“张三”
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query = query.filter(Student.student_name.like(f"%{student_name}%"))
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# 班级 ID 使用精确查询
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if class_id is not None:
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query = query.filter(Student.class_id == class_id)
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# 分页之前统计符合条件的总条数
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total = query.count()
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#默认按学生id排序
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students = (
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query
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.order_by(Student.id.desc())
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.offset((page - 1) * page_size)
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.limit(page_size)
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.all()
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)
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return total, students
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#逻辑删除学生
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def delete_student(student_id: int, db: Session):
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# 第一步：查询学生
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student = get_student_by_id(student_id, db)
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if not student:
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return None
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try:
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# 第二步：不真正删除记录，只把删除标记改成 1
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student.is_deleted = 1
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# 第三步：提交修改
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db.commit()
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return student
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except Exception as e:
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# 删除失败时回滚
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db.rollback()
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print("删除学生失败：", e)
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return False
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