添加数据库连接

mini-program/app/db.py

@@ -0,0 +1,45 @@
+from collections.abc import Generator
+
+from sqlalchemy import create_engine, text
+from sqlalchemy.orm import Session, sessionmaker
+
+try:
+    # For module mode: `uvicorn app.main:app`
+    from app.settings import settings
+except ModuleNotFoundError:
+    # For script mode: `python app/main.py` or VS Code "Run Python File"
+    from settings import settings
+
+
+engine = create_engine(
+    settings.mysql_dsn,
+    pool_size=5,
+    max_overflow=10,
+    pool_pre_ping=True,
+    pool_recycle=1800,
+    future=True,
+)
+
+SessionLocal = sessionmaker(
+    bind=engine,
+    autocommit=False,
+    autoflush=False,
+    expire_on_commit=False,
+)
+
+
+def get_db() -> Generator[Session, None, None]:
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()
+
+
+def check_db_connection() -> None:
+    with engine.connect() as conn:
+        conn.execute(text("SELECT 1"))
+
+
+def close_db_engine() -> None:
+    engine.dispose()

mini-program/app/main.py

@@ -4,10 +4,12 @@ from fastapi import FastAPI
 
 try:
     # For module mode: `uvicorn app.main:app`
+    from app.db import check_db_connection, close_db_engine
     from app.routers.health import router as health_router
     from app.settings import settings
 except ModuleNotFoundError:
     # For script mode: `python app/main.py` or VS Code "Run Python File"
+    from db import check_db_connection, close_db_engine
     from routers.health import router as health_router
     from settings import settings
 
@@ -18,6 +20,15 @@ def create_app() -> FastAPI:
         version=settings.app_version,
         description=settings.app_description,
     )
+
+    @app.on_event("startup")
+    def on_startup() -> None:
+        check_db_connection()
+
+    @app.on_event("shutdown")
+    def on_shutdown() -> None:
+        close_db_engine()
+
     app.include_router(health_router)
     return app
 

mini-program/requirements.txt

@@ -2,3 +2,5 @@ fastapi==0.115.11
 uvicorn[standard]==0.34.0
 pydantic-settings==2.8.1
 python-dotenv==1.0.1
+SQLAlchemy==2.0.38
+PyMySQL==1.1.1