加了带班信息查询，查询老师list表优化

dao/wl_teacher_dao.py

@@ -11,16 +11,23 @@ def generate_teacher_no():
     seq = random.randint(1, 999)
     return f"T{date_str}{seq:03d}"
 
-def list_teachers(db: Session):
-    """查询全部未删除教师列表"""
-    return db.query(Teacher).filter(Teacher.is_deleted == 0).order_by(Teacher.t_id.desc()).all()
+def list_teachers(db: Session, page: int = 1, page_size: int = 10):
+    skip = (page - 1) * page_size
+    return (db.query(Teacher)
+            .filter(Teacher.is_deleted == 0)
+            .order_by(Teacher.t_id.desc())
+            .offset(skip)
+            .limit(page_size)
+            .all())
 
 def get_teacher_id(db: Session, t_id: int):
-    return (db.query(Teacher).filter(Teacher.t_id == t_id, Teacher.is_deleted == 0)
+    return (db.query(Teacher)
+            .filter(Teacher.t_id == t_id, Teacher.is_deleted == 0)
             .first() )
 
 def get_teacher_no(db:Session, t_no: str):
-    return(db.query(Teacher).filter(Teacher.t_no == t_no,Teacher.is_deleted == 0)
+    return(db.query(Teacher).
+           filter(Teacher.t_no == t_no,Teacher.is_deleted == 0)
            .first())
 
 
@@ -62,4 +69,10 @@ def delete_teacher_logic(db: Session, t_id: int):
         return None
     db_obj.is_deleted = 1
     db.commit()
-    return db_obj
+    return db_obj
+
+def get_teacher_class_info(db: Session, t_id: int):
+    teacher = get_teacher_id(db, t_id)
+    if teacher:
+        return teacher.class_id
+    return None