正式起服务打底

app/config.py

@@ -0,0 +1,48 @@
+# app/config.py
+import os
+from functools import lru_cache
+
+
+class Settings:
+    """
+    后端配置：
+    - APP_ENV: dev / prod
+    - DB_*: 数据库连接参数
+    - 默认库：dev 用 LLZQ-test；prod 用 LLZQ
+    """
+
+    def __init__(self) -> None:
+        self.app_env = os.getenv("APP_ENV", "dev").lower()
+
+        self.db_host = os.getenv("DB_HOST", "127.0.0.1")
+        self.db_port = int(os.getenv("DB_PORT", "5432"))
+        self.db_user = os.getenv("DB_USER", "local-Python")
+        self.db_password = os.getenv("DB_PASSWORD", "")
+
+        # 默认连接的库，根据 APP_ENV 决定
+        if self.app_env == "prod":
+            self.db_name_default = "LLZQ"
+        else:
+            self.db_name_default = "LLZQ-test"
+
+        self.db_schema = os.getenv("DB_SCHEMA", "XCX")
+
+    def resolve_db_name(self, env_header: str | None) -> str:
+        """
+        根据前端传来的 X-LLZQ-Env 决定最终使用哪个 DB：
+        - "prod" => LLZQ
+        - 其它/为空 => LLZQ-test
+        """
+        if env_header is None:
+            return self.db_name_default
+
+        env_header = env_header.lower()
+        if env_header == "prod":
+            return "LLZQ"
+        else:
+            return "LLZQ-test"
+
+
+@lru_cache()
+def get_settings() -> Settings:
+    return Settings()