初始化

backend/app/database.py

@@ -0,0 +1,33 @@
+from sqlalchemy import create_engine, event
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.orm import sessionmaker, Session
+from app.config import get_settings
+
+settings = get_settings()
+
+# 创建引擎
+engine = create_engine(
+    settings.DATABASE_URL,
+    connect_args={"check_same_thread": False} if settings.DATABASE_URL.startswith("sqlite") else {},
+    echo=settings.DEBUG
+)
+
+# 会话工厂
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+# 模型基类
+Base = declarative_base()
+
+
+def get_db() -> Session:
+    """获取数据库会话"""
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()
+
+
+def init_db():
+    """初始化数据库"""
+    Base.metadata.create_all(bind=engine)