feat(NoteForm): 增加文件上传状态反馈

backend/app/db/engine.py

@@ -0,0 +1,36 @@
+import os
+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker, declarative_base
+from dotenv import load_dotenv
+
+load_dotenv()
+
+# 默认 SQLite，如果想换 PostgreSQL 或 MySQL，可以直接改 .env
+DATABASE_URL = os.getenv("DATABASE_URL", "sqlite:///bili_note.db")
+
+# SQLite 需要特定连接参数，其他数据库不需要
+engine_args = {}
+if DATABASE_URL.startswith("sqlite"):
+    engine_args["connect_args"] = {"check_same_thread": False}
+
+engine = create_engine(
+    DATABASE_URL,
+    echo=os.getenv("SQLALCHEMY_ECHO", "false").lower() == "true",
+    **engine_args
+)
+
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+Base = declarative_base()
+
+
+def get_engine():
+    return engine
+
+
+def get_db():
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()