# 17. Error Handling Strategy

定义前端和后端的统一错误处理：

## 17.1 错误流程

```mermaid
sequenceDiagram
    participant Client as 客户端
    participant API as API网关
    participant Service as 业务服务
    participant DB as 数据库

    Client->>API: API请求
    API->>Service: 调用业务逻辑
    Service->>DB: 数据库操作

    alt 操作成功
        DB-->>Service: 成功结果
        Service-->>API: 业务数据
        API-->>Client: 成功响应
    else 发生错误
        DB-->>Service: 数据库错误
        Service->>Service: 捕获并包装错误
        Service-->>API: 标准错误格式
        API->>API: 添加请求ID和时间戳
        API-->>Client: 错误响应
        Client->>Client: 统一错误处理
        Client-->>User: 显示友好错误信息
    end
```

## 17.2 错误响应格式

```typescript
interface ApiError {
  error: {
    code: string;
    message: string;
    details?: Record<string, any>;
    timestamp: string;
    requestId: string;
  };
}
```