React Query 数据库插件：与全文检索引擎的集成实践

// 导入 Elasticsearch 客户端
import { Client } from '@elastic/elasticsearch';

// 创建 Elasticsearch 客户端实例
const client = new Client({ node: 'http://localhost:9200' });

// 自定义查询函数
const searchPosts = async (query) => {
  const { body } = await client.search({
    index: 'articles',
    body: {
      query: {
        match: {
          title: query,
        },
      },
    },
  });
  
  return body.hits.hits.map(hit => hit._source);
};

// 在 React Query 中注册自定义查询函数
const queryClient = new QueryClient();
queryClient.setQueryDefaults({ queries: { enabled: false } });
queryClient.setDefaultOptions({ queries: { enabled: true } });
queryClient.setQueryFn('searchPosts', searchPosts);

// 在组件中使用自定义查询函数
const SearchForm = () => {
  const queryClient = useQueryClient();
  
  const onSubmit = (e) => {
    e.preventDefault();
    const query = e.target.elements.query.value;
    queryClient.invalidateQueries('searchPosts', { query });
  };
  
  return (
    <form onSubmit={onSubmit}>
      <input type="text" name="query" />
      <button type="submit">搜索</button>
    </form>
  );
};

const SearchResults = () => {
  const queryClient = useQueryClient();
  const query = 'React Query';

  const { data, isFetching } = useQuery('searchPosts', () => queryClient.fetchQueryData('searchPosts', query));
  
  if (isFetching) {
    return <div>Loading...</div>;
  }
  
  if (data && data.length === 0) {
    return <div>No results found</div>;
  }
  
  return (
    <ul>
      {data.map(post => (
        <li key={post.id}>{post.title}</li>
      ))}
    </ul>
  );
};