更新学期功能

backend/models/semester.py

@@ -137,6 +137,73 @@ class SemesterModel:
             GROUP BY hs.student_id, hs.status
         """
         return await execute_query(sql, (start_date, end_date))
+    
+    @staticmethod
+    async def update(
+        semester_id: int,
+        semester_name: str = None,
+        start_date: str = None,
+        end_date: str = None
+    ) -> bool:
+        """编辑学期信息（仅未归档）"""
+        sets = []
+        params = []
+        if semester_name is not None:
+            sets.append("semester_name = %s")
+            params.append(semester_name)
+        if start_date is not None:
+            sets.append("start_date = %s")
+            params.append(start_date)
+        if end_date is not None:
+            sets.append("end_date = %s")
+            params.append(end_date)
+        if not sets:
+            return False
+        params.append(semester_id)
+        sql = f"UPDATE semesters SET {', '.join(sets)} WHERE semester_id = %s AND is_archived = 0"
+        result = await execute_update(sql, tuple(params))
+        return result > 0
+    
+    @staticmethod
+    async def delete(semester_id: int) -> bool:
+        """删除学期"""
+        sql = "DELETE FROM semesters WHERE semester_id = %s"
+        result = await execute_update(sql, (semester_id,))
+        return result > 0
+    
+    @staticmethod
+    async def count_archives(semester_id: int) -> int:
+        """统计学期的归档数据数量"""
+        sql = "SELECT COUNT(*) as cnt FROM semester_archives WHERE semester_id = %s"
+        result = await execute_one(sql, (semester_id,))
+        return result['cnt'] if result else 0
+    
+    @staticmethod
+    async def associate_records_by_date_range(
+        semester_id: int,
+        start_date: str,
+        end_date: str
+    ) -> Dict[str, int]:
+        """按日期范围关联记录到学期"""
+        # 关联操行分记录（created_at 为 TIMESTAMP，需包含 end_date 当天）
+        conduct_sql = """
+            UPDATE conduct_records
+            SET semester_id = %s
+            WHERE semester_id IS NULL
+              AND created_at BETWEEN %s AND CONCAT(%s, ' 23:59:59')
+        """
+        conduct_count = await execute_update(conduct_sql, (semester_id, start_date, end_date))
+        
+        # 关联考勤记录
+        attendance_sql = """
+            UPDATE attendance_records
+            SET semester_id = %s
+            WHERE semester_id IS NULL
+              AND `date` BETWEEN %s AND %s
+        """
+        attendance_count = await execute_update(attendance_sql, (semester_id, start_date, end_date))
+        
+        return {"conduct": conduct_count, "attendance": attendance_count}
 
 
 class SemesterArchiveModel: