From 1e891a73e1e8f2488c1ccbe389debf02e677001f Mon Sep 17 00:00:00 2001
From: wolin_ck666_999 <ck666_999@163.com>
Date: Tue, 22 Sep 2026 13:17:44 +0800
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---
 dao/student_dao.py | 57 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 57 insertions(+)
 create mode 100644 dao/student_dao.py

diff --git a/dao/student_dao.py b/dao/student_dao.py
new file mode 100644
index 0000000..366ad79
--- /dev/null
+++ b/dao/student_dao.py
@@ -0,0 +1,57 @@
+from sqlalchemy.orm import Session
+from model.student_model import Student
+from schema.student_schema import StudentCreateRequest,StudentUpdateRequest
+def create_student(db: Session, student_create: StudentCreateRequest):
+    """
+    新增学生
+    : db: 数据库会话
+    :student_c reate: 前端传来的新增请求体
+    """
+    db_student = Student(**student_create.model_dump())#请求体转为字典，再解包创建实体对象
+    db.add(db_student)#添加
+    db.commit()#提交事务
+    new_student=db.query(Student).filter(
+        Student.stu_id==student_create.stu_id,
+        Student.is_deleted==False).first()
+    #查询 Student 表,取第一条，没有则返回 None
+    return new_student
+def get_student_by_id(db: Session, stu_id: int):#根据stu_id查询单个学生
+    query = db.query(Student).filter(
+        Student.stu_id == stu_id,
+        Student.is_deleted == False)
+    return query.first()
+def get_student_list(db: Session, stu_id:None,
+                     class_id:str=None, page:int=1, page_size:int=10, stu_name:str=None):#查询学生列表，支持按照编号/姓名/班级删选
+    # 基础查询：只查未逻辑删除的学生
+    query = db.query(Student).filter(Student.is_deleted == False)
+    if stu_id:
+        query = query.filter(Student.stu_id == stu_id)
+    if stu_name:
+        query = query.filter(Student.stu_name == stu_name)
+    if class_id:
+        query = query.filter(Student.class_id == class_id)
+    total = query.count()#统计满足条件的记录
+    offset = (page - 1) * page_size# 计算分页偏移量：跳过前面 (page-1)*page_size 条
+    db_student_list = query.offset(offset).limit(page_size).all()# 执行分页查询：跳过offset条，取page_size条
+    return total, db_student_list
+def update_student(db: Session, stu_id:int,student_update: StudentUpdateRequest):
+    """修改学生信息
+db: 数据库会话stu_id: 要修改的学生主键student_update: 前端传来的修改请求体:
+"""
+    db_student = get_student_by_id(db=db,stu_id=stu_id)
+    if not db_student:
+        return None#先查学生，查不到报错
+    update_data=student_update.model_dump(exclude_unset=True)#只解析前端输入的键值对，默认值不会解析
+    for k,v in update_data.items():
+        setattr(db_student,k,v)#把 value 赋给 db_student 的 key 属性。
+    db.commit()
+    updated_student=get_student_by_id(db, stu_id)
+    return updated_student
+def delete_student_logic(db: Session, stu_id:int):
+    db_student = get_student_by_id(db, stu_id)
+    if not db_student:
+        return None
+    db_student.is_deleted = True#把逻辑删除标记改成True
+    db.commit()#重新查询，返回标记已删除的这条记录
+    deleted_student = db.query(Student).filter(Student.stu_id == stu_id).first()
+    return deleted_student