更新了一点，没思路了

orm/blue_forecast.py

@@ -0,0 +1,12 @@
+from orm_db import *
+from sqlalchemy import select, desc
+
+try:
+    get_last_data_stmt = select(History).order_by(desc('id')).limit(1)
+    last_data_result = db_session.execute(get_last_data_stmt).scalar()
+    print(last_data_result)
+except Exception as e:
+    print(e)
+
+last_blue = last_data_result.blue
+print(last_blue)

orm/orm_db.py

@@ -1,6 +1,6 @@
 import sqlalchemy
 from sqlalchemy import create_engine
-from sqlalchemy.orm import declarative_base
+from sqlalchemy.orm import declarative_base, sessionmaker
 from sqlalchemy import Column, Integer, String, DATE
 
 # 创建数据引擎
@@ -72,8 +72,5 @@ class RedForecastAll(Base):
 # 创建数据表，下面部分没有联想
 Base.metadata.create_all(engine)
 
-
-from sqlalchemy.orm import sessionmaker
-
 Session_class = sessionmaker(bind=engine)  # 创建与数据引擎的绑定会话类
-session = Session_class()  # 实例化session连接
+db_session = Session_class()  # 实例化session连接

orm/real_index.py

@@ -0,0 +1,2 @@
+from orm_db import *
+