React Query データベース プラグイン: バックエンド API と統合するための究極のガイド

npm install react-query

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

const queryClient = new QueryClient();

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

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

const fetchUsers = async () => {
  const response = await fetch('/api/users');
  return response.json();
};

const createUser = async (user) => {
  const response = await fetch('/api/users', {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
    },
    body: JSON.stringify(user),
  });
  return response.json();
};

const useUsers = () => {
  return useQuery('users', fetchUsers);
};

const useCreateUser = () => {
  return useMutation(createUser);
};

export { useUsers, useCreateUser };

import { useUsers, useCreateUser } from './api';

const UserList = () => {
  const { data: users, isLoading, isError } = useUsers();

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

  if (isError) {
    return <div>Error loading users.</div>;
  }

  return (
    <div>
      {users.map((user) => (
        <div key={user.id}>{user.name}</div>
      ))}
    </div>
  );
};

const CreateUserForm = () => {
  const createUser = useCreateUser();

  const handleSubmit = async (event) => {
    event.preventDefault();
    const form = event.target;
    const user = {
      name: form.name.value,
      email: form.email.value,
    };

    try {
      await createUser.mutateAsync(user);
      form.reset();
    } catch (error) {
      console.error('Error creating user:', error);
    }
  };

  return (
    <form onSubmit={handleSubmit}>
      <input type="text" name="name" placeholder="Name" required />
      <input type="email" name="email" placeholder="Email" required />
      <button type="submit">Create User</button>
    </form>
  );
};