尝试合并，所有代码需要调整from后文件路径。

students/databases.py

@@ -3,7 +3,17 @@
 from sqlalchemy import *
 from sqlalchemy.orm import sessionmaker,declarative_base
 
-db_url = "mysql+pymysql://root:420821@localhost:3306/student_manage_system?charset=utf8mb4"
+# 导入.env参数
+import os
+from dotenv import load_dotenv
+load_dotenv( )
+DB_USER = os.getenv("DB_USER", "root")
+DB_PASSWORD = os.getenv("DB_PASSWORD", "")
+DB_HOST = os.getenv("DB_HOST", "localhost")
+DB_PORT = os.getenv("DB_PORT", "3306")
+DB_NAME = os.getenv("DB_NAME", "student_manage_system")
+
+db_url = f"mysql+pymysql://{DB_USER}:{DB_PASSWORD}@{DB_HOST}:{DB_PORT}/{DB_NAME}?charset=utf8mb4"
 
 engine1 = create_engine(db_url)