Use React Query and database to control data access permissions

Using React Query and database to implement data access control

In modern web applications, data access control is an integral part. It ensures that only authorized users can access and manipulate specific data. Using React Query combined with the database to control data access permissions can provide an efficient and scalable solution.

React Query is a powerful and flexible data retrieval and management library that handles data retrieval, caching and updating in an easy and intuitive way. It integrates well with various backends and databases, and can be easily integrated with authentication and authorization systems.

In this article, we will introduce the basic principles of how to use React Query and the database to implement data access control, and give some specific code examples.

1. Define permission models and roles
   First, we need to define permission models and roles. The permission model defines what data and operations exist in the system and gives the permissions that different roles have on these data and operations. A role is a set of permissions, and each user can be assigned one or more roles.
2. Set data access restrictions for different roles
   According to the permission model and role definition, we can set data access restrictions for different roles. For example, one role might be able to read only specific data, while another role can read and modify all data. We can use React Query's query hooks to achieve these restrictions. Here is an example:

import { useQuery } from 'react-query';

const getData = async () => {
  // 这里是获取数据的逻辑
}

const useRestrictedData = (role) => {
  const { data, isLoading, isError } = useQuery(
    'restrictedData',
    getData,
    {
      enabled: role === 'admin', // 只有管理员角色可以访问
    }
  );

  return { data, isLoading, isError };
}

function RestrictedDataComponent() {
  const { data, isLoading, isError } = useRestrictedData('admin');

  if (isLoading) {
    return 'Loading...';
  }

  if (isError) {
    return 'Error loading data.';
  }

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

In the above example, only the administrator role can get restricted data through the useRestrictedData('admin') hook. For other roles, the enabled property is set to false, so the query will not be triggered.

3. Combined with the database for permission verification
   To achieve true data access permission control, we need to combine the database for permission verification. This usually involves storing the user's role information in the database and validating the user's role before querying the data. Here is a simple example:

import { useQuery } from 'react-query';
import { db } from '../myDatabase'; // 假设我们使用了一个名为 db 的数据库库

const getData = async () => {
  const userRole = getCurrentUserRole(); // 获取当前用户的角色信息
  
  if (userRole === 'admin') {
    return db.query('SELECT * FROM restrictedData');
  } else {
    throw new Error('Unauthorized access');
  }
}

const useRestrictedData = () => {
  const { data, isLoading, isError } = useQuery(
    'restrictedData',
    getData
  );

  return { data, isLoading, isError };
}

// 省略其他代码...

In the above example, we used a hypothetical db module to perform database query operations. In the getData function, we obtain the current user's role information through the getCurrentUserRole() function. If the user role is administrator, we perform database query operations, otherwise an unauthorized access error is thrown.

It should be noted that the database query logic in the above example is a simple example and not a real database access code. In practical applications, we need to write corresponding query code based on the specific backend and database.

Conclusion

Using React Query combined with the database, we can easily implement data access control. In this article, we introduced how to define permission models and roles, and gave example code for how to perform permission verification with React Query and a database. Of course, the specific implementation methods will vary depending on actual needs and technology stacks. I hope this article can help readers understand how to use React Query and database to achieve data access control, and provide some reference for the development of actual projects.

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