How to achieve instant replication of database in React Query?

How to implement instant replication of database in React Query?

Introduction:
In the development of modern applications, real-time replication of the database is often involved. Instant replication means that when additions, deletions, and modifications occur in the database, the latest data can be automatically synchronized to the application. React Query is a powerful tool for managing application data, providing many useful features to handle fetching, updating, and caching of data. This article will introduce how to use React Query to achieve instant replication of the database and provide specific code examples.

Step 1: Install and set up React Query
First, we need to install React Query and set it up. Execute the following command in the terminal:

npm install react-query

Then, import React Query in the application's entry file and use the QueryClientProvider component to provide the global QueryClient object. The sample code is as follows:

import React from 'react';
import ReactDOM from 'react-dom';
import { QueryClient, QueryClientProvider } from 'react-query';

const queryClient = new QueryClient();

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

Step 2: Define query and update functions
Next, we need to define query and update functions. Query functions are used to obtain the latest data from the database, while update functions are used to insert, update, or delete data into the database. The sample code is as follows:

import { useQuery, useMutation } from 'react-query';

// 查询函数
const fetchItems = async () => {
  const response = await fetch('/api/items');
  return response.json();
};

// 更新函数
const updateItem = async (item) => {
  const response = await fetch(`/api/items/${item.id}`, {
    method: 'PATCH',
    headers: {
      'Content-Type': 'application/json',
    },
    body: JSON.stringify(item),
  });
  return response.json();
};

Step 3: Use useQuery and useMutation
Now, we can use useQuery and useMutation hooks in the component to obtain and update data. The sample code is as follows:

import { useQuery, useMutation } from 'react-query';

const ItemList = () => {
  // 获取最新的数据
  const { data: items } = useQuery('items', fetchItems);

  // 创建更新函数
  const mutation = useMutation(updateItem, {
    onSuccess: () => {
      queryClient.invalidateQueries('items');
    },
  });

  // 提交数据更新
  const handleSubmit = () => {
    const item = {
      id: 1,
      name: 'New Item',
    };
    mutation.mutate(item);
  };

  return (
    <div>
      <ul>
        {items.map((item) => (
          <li key={item.id}>{item.name}</li>
        ))}
      </ul>
      <button onClick={handleSubmit}>添加新项目</button>
    </div>
  );
};

In the above sample code, we use useQuery hook to get the latest data, and use useMutation hook to create an update function. When the data is successfully updated, we invalidate the query and trigger re-fetching of the data by calling queryClient.invalidateQueries('items').

Summary:
By using React Query, we can easily achieve instant replication of the database. First, we need to install and set up React Query, and define query and update functions. Then, we can use useQuery and useMutation hooks in the component to obtain and update data. Instant replication of the database can be achieved by calling the queryClient.invalidateQueries method in the onSuccess callback of the update function. In this way, we can easily achieve instant synchronization and update of data.

The above is a detailed introduction and code example on how to implement instant replication of the database in React Query. I hope this article can help readers better understand and apply React Query to realize the instant replication function of the database.

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