Completely master Swoole's coroutine MySQL design ideas and application practices

Swoole is a high-performance network communication framework based on PHP language. It supports multiple protocols such as TCP/UDP/HTTP/WebSocket, and also supports coroutine implementation. In the fields of Internet acceleration, Internet of Things, game development, big data processing and other fields, Swoole has become the preferred framework for many developers.

In the Swoole framework, coroutine MySQL is a very important component. Coroutine MySQL provides an efficient and simple way to connect and operate MySQL database. Compared with the traditional MySQL connection method, coroutine MySQL has obvious advantages in performance. In this article, we will discuss Swoole's coroutine MySQL design ideas and application practices to help readers better master this important component.

1. The design idea of ​​coroutine MySQL

The design idea of ​​coroutine MySQL is mainly divided into two aspects:

1. Long connection and connection pool

Coroutine MySQL uses long connections and connection pools to achieve efficient database connections. A long connection means that the basic TCP connection to the MySQL database remains undisconnected until the process exits or is manually closed. This can reduce the overhead of re-establishing the TCP connection for each request and improve connection efficiency. The connection pool is to make full use of connection resources and allocate the connections in the connection pool according to certain strategies. Through the connection pool, you can control the number and validity period of connections to avoid exhaustion of database connection resources.

2. Asynchronous IO and coroutines

Coroutines MySQL uses asynchronous IO and coroutines to achieve efficient IO processing. Traditional MySQL connections are synchronous, which means that when executing a SQL query, it will wait until the query results are returned. Coroutine MySQL uses coroutine and asynchronous IO technology to separate data requests and processing, so that the query request can be processed immediately after being sent for the next query or other operations without waiting for the query results. When the query results are returned, coroutine MySQL will automatically trigger coroutine recovery and pass the results to the coroutine for processing.

2. Application practice of coroutine MySQL

In the Swoole framework, using coroutine MySQL is also very simple. Below we will use a simple example to demonstrate the basic application of coroutine MySQL.

1. First of all, we need to enable the coroutine MySQL extension in Swoole, which can be achieved through the following code:

Coun(function() {
    $mysql = new SwooleCoroutineMySQL();
    $mysql->connect([
        'host' => '127.0.0.1',
        'user' => 'root',
        'password' => 'root',
        'database' => 'test_db',
    ]);
});

In the above code, we first use Coun to create A coroutine then creates a MySQL connection through SwooleCoroutineMySQL (the coroutine MySQL class in Swoole). Among them, the MySQL connection parameters are configured in the connect method. Through this example, we have implemented a simple MySQL connection and can start reading and writing data.

2. Next, we will demonstrate how to query the MySQL database. The following is a sample code:

Coun(function () {
    $mysql = new SwooleCoroutineMySQL();
    $mysql->connect([
        'host' => '127.0.0.1',
        'user' => 'root',
        'password' => 'root',
        'database' => 'test',
    ]);
    $result = $mysql->query('SELECT * FROM users where id = 1');
    var_dump($result);
});

In the above code, we implement a basic query operation through the query method, query the record with id 1 in the users table, and output the query results.

3. Finally, we will describe how to write to the MySQL database. The following is a sample code:

Coun(function () {
    $mysql = new SwooleCoroutineMySQL();
    $mysql->connect([
        'host' => '127.0.0.1',
        'user' => 'root',
        'password' => 'root',
        'database' => 'test',
    ]);
    $data = ['name' => 'user1', 'password' => 'pwd1'];
    $tableName = 'users';
    $keys = implode(',', array_keys($data));
    $values = implode(',', array_fill(0, count($data), '?'));
    $sql = "INSERT INTO `{$tableName}` ({$keys}) VALUES ({$values})";
    $params = array_values($data);
    $result = $mysql->prepare($sql)->execute($params);
    var_dump($result);
});

In the above code, we implement a basic SQL writing operation through the prepare method and execute method. The prepare method can create a prepared statement, pass in SQL and the parameters to be bound, and return a coroutine MySQL preprocessing object. The execute method executes the prepared statement and returns the execution result.

Summary

Coroutine MySQL is a very important module in the Swoole framework. It uses technologies such as long connections, connection pools, asynchronous IO and coroutines to achieve efficient and stable MySQL connections. with read and write operations. Through the introduction of this article, we can better understand the design ideas and application practices of coroutine MySQL, and thus better master the use of coroutine MySQL.

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