后端开发完成

backend/app/database/database.py

@@ -0,0 +1,27 @@
+from sqlalchemy import create_engine
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.orm import sessionmaker
+from app.config import settings
+
+# 创建数据库引擎
+engine = create_engine(
+    settings.database_url,
+    pool_pre_ping=True,
+    pool_size=10,
+    max_overflow=20
+)
+
+# 创建会话工厂
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+# 创建基类
+Base = declarative_base()
+
+
+def get_db():
+    """获取数据库会话的依赖函数"""
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()