在 React Query 中优化数据库查询性能的技巧

import { useQuery } from 'react-query';

const getUsers = async (ids) => {
  const response = await fetch(`/api/users?ids=${ids.join(',')}`);
  const data = await response.json();
  return data;
};

const UserList = () => {
  const userIds = [1, 2, 3, 4, 5];
  const { data } = useQuery(['users', userIds], () => getUsers(userIds));
  
  return (
    <ul>
      {data.map(user => (
        <li key={user.id}>{user.name}</li>
      ))}
    </ul>
  );
};

const UserProfile = ({ userId }) => {
  const { data } = useQuery(['user', userId], () => getUser(userId));
  
  return (
    <div>
      <h2>{data.name}</h2>
      <p>{data.email}</p>
      <p>{data.bio}</p>
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    </div>
  );
};

const UserPage = () => {
  const userIds = [1, 2, 3, 4, 5];
  
  return (
    <div>
      <h1>User Page</h1>
      {userIds.map(userId => (
        <UserProfile key={userId} userId={userId} />
      ))}
    </div>
  );
};

import { useQueryClient } from 'react-query';

const Home = () => {
  const queryClient = useQueryClient();
  
  useEffect(() => {
    queryClient.prefetchQuery('users', getUsers);
    queryClient.prefetchQuery('posts', getPosts);
  }, []);
  
  return (
    <div>
      {/* 组件内容 */}
    </div>
  );
};

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

const updateUser = async (userId, newData) => {
  const response = await fetch(`/api/users/${userId}`, {
    method: 'PUT',
    body: JSON.stringify(newData),
    headers: { 'Content-Type': 'application/json' },
  });
  
  if (!response.ok) {
    throw new Error('更新用户失败');
  }
};

const UserProfile = ({ userId }) => {
  const queryClient = useQueryClient();
  
  const { data } = useQuery(['user', userId], () => getUser(userId));

  const updateUserMutation = useMutation(newData => updateUser(userId, newData), {
    onSuccess: () => {
      queryClient.invalidateQueries(['user', userId]);
    },
  });
  
  const handleUpdateUser = (newData) => {
    updateUserMutation.mutate(newData);
  };
  
  return (
    <div>
      <h2>{data.name}</h2>
      <p>{data.email}</p>
      <p>{data.bio}</p>
      <button onClick={() => handleUpdateUser({ name: 'new name' })}>
        更新用户
      </button>
    </div>
  );
};