How to achieve separation of read and write in database in React Query?

How to achieve separation of read and write in database in React Query?

In modern front-end development, the separation of read and write in the database is an important architectural design consideration. React Query is a powerful state management library that optimizes the data acquisition and management process for front-end applications. This article will introduce how to use React Query to achieve separation of read and write in the database, and provide specific code examples.

The core concepts of React Query are Query, Mutation and QueryClient. Query is used to obtain data, Mutation is used to modify data, and QueryClient is used to manage and track the status of queries and mutations. We can use these concepts to achieve separation of read and write in the database.

First, we need to configure two different API clients, one for reading data and the other for writing data. We can use libraries like axios or fetch to create these API clients. Here is a sample code:

import axios from 'axios';

const readApiClient = axios.create({
  baseURL: 'https://api.read.com',
});

const writeApiClient = axios.create({
  baseURL: 'https://api.write.com',
});

export { readApiClient, writeApiClient };

Next, we can configure these two clients in the application using React Query’s QueryProvider and MutationProvider components. QueryProvider is used to configure the client that reads data, and MutationProvider is used to configure the client that writes data. Here is a sample code:

import { QueryClient, QueryProvider, MutationProvider } from 'react-query';
import { readApiClient, writeApiClient } from './api';

const queryClient = new QueryClient();

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

Now we can use React Query’s useQuery and useMutation hooks in the components of the application to send requests to read and write data. Here is a sample code:

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

const fetchUser = async () => {
  const response = await readApiClient.get('/users/1');
  return response.data;
};

const updateUser = async (userData) => {
  const response = await writeApiClient.put('/users/1', userData);
  return response.data;
};

const Profile = () => {
  const { data, isLoading } = useQuery('user', fetchUser);
  const mutation = useMutation(updateUser, {
    onSuccess: () => {
      queryClient.invalidateQueries('user');
    },
  });

  if (isLoading) {
    return <p>Loading...</p>;
  }

  return (
    <div>
      <h1>{data.name}</h1>
      <button onClick={() => mutation.mutate({ name: 'John Doe' })}>
        Update Name
      </button>
    </div>
  );
};

In the above code, we use useQuery hook to get user data and useMutation hook to update user data. After a successful update, we use the queryClient.invalidateQueries method to invalidate the query in order to re-fetch the latest user data.

Through the above steps, we successfully achieved the separation of reading and writing in the database. Using React Query's QueryProvider and MutationProvider components, we can configure different API clients for read and write operations, thus achieving separation of read and write in the database. At the same time, by using useQuery and useMutation hooks, we can easily send requests to read and write data in the component, and perform state management and updates.

To sum up, React Query is a powerful state management library that can help us optimize the data acquisition and management process of front-end applications. By properly configuring different API clients and using QueryProvider, MutationProvider, useQuery and useMutation hooks, we can achieve database read-write separation in React Query. This is very important for building efficient and scalable front-end applications.

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