How to achieve high availability of database in React Query?

How to achieve high availability of database in React Query?

Foreword:
As the complexity of modern applications continues to increase, the requirements for high availability and fault tolerance of databases are also getting higher and higher. In the process of using React Query as a data management solution, we can take some measures to increase the high availability of the database. This article will introduce how to achieve high availability of the database in React Query.

1. Using database transactions
In React Query, we can use database transactions to ensure the atomicity and consistency of database operations. A transaction refers to a group of database operations that are bound together and either all execute successfully or all are rolled back. Using transactions can prevent data inconsistency in the event of a database failure. In React Query, we can use the useMutation hook to wrap database operations and wrap multiple database operations in a transaction to ensure data consistency.
The following is a sample code:

import { useMutation } from 'react-query';

const createNewUser = async (userData) => {
  // 开始事务
  await database.transaction();
  
  try {
    // 执行数据库操作
    await database.query('INSERT INTO users VALUES (?)', [userData]);

    // 提交事务
    await database.commit();
  
  } catch (error) {
    // 回滚事务
    await database.rollback();
  }
};

const useCreateNewUser = () => {
  return useMutation(createNewUser);
};

const CreateUserComponent = () => {
  const createNewUser = useCreateNewUser();

  const handleCreateUser = async (userData) => {
    try {
      await createNewUser.mutateAsync(userData);
      // 用户创建成功
    } catch (error) {
      // 用户创建失败
    }
  };

  // 渲染表单和提交按钮
};

2. Use database master-slave replication
In React Query, we can increase the availability of the database by replicating the database from master to slave. Master-slave replication refers to synchronizing the update operations of the master database to the slave database. The slave database can be used for read operations, and the master database can be used for write operations. This can improve the concurrent reading capability of the system, and can switch to the secondary database to continue providing services when the primary database fails.
The following is a sample code:

const databaseConfig = {
  master: {
    host: 'master-db-host',
    port: 'master-db-port',
    username: 'master-db-username',
    password: 'master-db-password',
  },
  slaves: [
    {
      host: 'slave1-db-host',
      port: 'slave1-db-port',
      username: 'slave1-db-username',
      password: 'slave1-db-password',
    },
    {
      host: 'slave2-db-host',
      port: 'slave2-db-port',
      username: 'slave2-db-username',
      password: 'slave2-db-password',
    },
  ],
};

const useDatabase = () => {
  const [databaseConnection, setDatabaseConnection] = useState(null);

  useEffect(() => {
    const masterDbConnection = createDatabaseConnection(databaseConfig.master);
    const slaveDbConnection = createDatabaseConnection(databaseConfig.slaves[0]);

    setDatabaseConnection({
      master: masterDbConnection,
      slaves: databaseConfig.slaves.map(slaveConfig => createDatabaseConnection(slaveConfig)),
    });

    return () => {
      masterDbConnection.close();
      slaveDbConnection.close();
    };
  }, []);

  return databaseConnection;
};

const CreateUserComponent = () => {
  const database = useDatabase();

  // 渲染表单和提交按钮
};

3. Use database cluster
In React Query, we can also increase the availability and fault tolerance of the database by using a database cluster. Database cluster refers to connecting multiple database servers together to form a cluster to achieve distributed storage and load balancing. When a database server fails, it can automatically switch to other servers to provide services. In React Query, we can implement database clustering using database connection pools and load balancers. The following is a sample code:

const databaseConfig = {
  connectionPoolSize: 10,
  servers: [
    {
      host: 'db-server1-host',
      port: 'db-server1-port',
      username: 'db-server1-username',
      password: 'db-server1-password',
    },
    {
      host: 'db-server2-host',
      port: 'db-server2-port',
      username: 'db-server2-username',
      password: 'db-server2-password',
    },
  ],
};

const useDatabase = () => {
  const [databaseConnectionPool, setDatabaseConnectionPool] = useState([]);

  useEffect(() => {
    const databaseConnections = databaseConfig.servers.map(serverConfig => createDatabaseConnection(serverConfig));
    setDatabaseConnectionPool(databaseConnections);

    return () => {
      databaseConnections.forEach(connection => connection.close());
    };
  }, []);

  return databaseConnectionPool;
};

const CreateUserComponent = () => {
  const databaseConnectionPool = useDatabase();

  // 渲染表单和提交按钮
};

Conclusion:
It is very important to achieve high availability of the database in React Query, which can ensure that the system can still work normally when a failure occurs. This article describes how to use transactions, master-slave replication, and database clustering to achieve high availability for your database, and provides corresponding code examples. Hope this article is helpful to you, thank you!

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