React Query Database Plugin: A way to achieve data archiving and recovery

React Query database plug-in: To implement data archiving and recovery methods, specific code examples are required

Introduction:
React Query is a powerful data management library. Can be used to manage remote data and local state in applications. It provides a set of easy-to-use APIs that can implement functions such as data acquisition, update, and caching. In addition to basic data management functions, React Query also supports plug-in extensions, allowing us to customize some functions according to specific needs. This article will introduce how to use the React Query database plug-in to implement data archiving and recovery, and provide specific code examples.

1. Introduction to React Query database plug-in
The React Query database plug-in is an extension library that allows us to store data in a local database to achieve data archiving and recovery functions. By using a database plug-in, we can store long-term data locally so that it can be quickly restored when the application reloads or an error occurs.

2. Install and configure the database plug-in
First, we need to use npm or yarn to install the React Query database plug-in. Open the terminal and execute the following command:

npm install react-query-db-plugin

or

yarn add react-query-db-plugin

After the installation is complete, we need to enable the database plug-in in the configuration of React Query. In the entry file of the application, such as index.js or App.js, add the following code:

import { QueryClient, QueryClientProvider } from 'react-query';
import { ReactQueryDBPlugin } from 'react-query-db-plugin';

const queryClient = new QueryClient();

// 创建数据库插件实例
const dbPlugin = new ReactQueryDBPlugin();

// 启用数据库插件
queryClient.use(dbPlugin);

// 渲染应用程序
ReactDOM.render(
  <QueryClientProvider client={queryClient}>
    <App />
  </QueryClientProvider>,
  document.getElementById('root')
);

3. Data archiving and recovery methods
The database plug-in provides two main methods for archiving and restoring data: archiveData and restoreData. Below we will introduce these two methods in detail respectively.

1. archiveData method
   archiveData method is used to archive data to a local database. We can selectively save data that needs long-term preservation to the database for future reloading or restoration.

import { useQueryClient } from 'react-query';

const ArchiveButton = () => {
  const queryClient = useQueryClient();

  const handleArchiveData = () => {
    // 获取所有查询的数据
    const data = queryClient.getQueryData();
  
    // 将数据存储到数据库
    queryClient.archiveData('myAppData', data);
  };

  return (
    <button onClick={handleArchiveData}>归档数据</button>
  );
};

In the above example, we first use the useQueryClient hook function to obtain an instance of QueryClient, and then define an ArchiveButton component. When the button is clicked , call the archiveData method, and store all queried data in a database named 'myAppData'.

2. restoreData method
   restoreData method is used to restore previously archived data from the database. We can use this method when the app reloads or an error occurs to quickly restore previously saved data.

import { useQueryClient } from 'react-query';

const RestoreButton = () => {
  const queryClient = useQueryClient();

  const handleRestoreData = async () => {
    // 从数据库中恢复数据
    const data = await queryClient.restoreData('myAppData');
  
    // 将数据设置为查询的数据
    queryClient.setQueryData(data);
  };

  return (
    <button onClick={handleRestoreData}>恢复数据</button>
  );
};

In the above example, we also use the useQueryClient hook function to obtain the instance of QueryClient, and then define a RestoreButton component. When the button is clicked , call the restoreData method, and set the data in 'myAppData' database to the queried data.

4. Summary
The React Query database plug-in provides us with data archiving and recovery functions, allowing us to store data that needs to be saved for a long time locally and quickly when the application is reloaded or an error occurs. Data recovery. By installing and configuring the database plug-in, and using the archiveData and restoreData methods, we can easily archive and restore data. I hope this article can help you understand and use the React Query database plug-in!

Reference link:

• React Query official documentation: https://react-query.tanstack.com/
• React Query database plug-in GitHub repository: https: //github.com/react-query-db/react-query-db

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