How Does Connection Pooling with Node.js and MySQL Boost Your Application's Performance?

Connection Pooling with Node.js and MySQL

Optimizing your application's use of MySQL can enhance performance and efficiency. This article explores connection pooling techniques using the node-mysql module.

Connection Pooling

Connection pooling eliminates the need to establish individual connections to the database for each query. Instead, a pool of reusable connections is maintained, improving query execution speed and reducing resource consumption.

Implementing Connection Pooling

To implement connection pooling, create a pool object using the createPool() function of the mysql module:

var mysql = require('mysql');

var pool = mysql.createPool({
    host: 'localhost',
    user: 'root',
    password: 'root',
    database: 'guess'
});

Store the pool object in a separate module (e.g., mysql.js) for reuse.

Querying the Database

To execute queries using the connection pool, require the mysql.js module and obtain a connection:

var mysql = require('../db/mysql').pool;

var test = function (req, res) {
    mysql.getConnection(function (err, conn) {
        conn.query("select * from users", function (err, rows) {
            res.json(rows);
        });
    });
};

Best Practices

• Pool Size: Determine an optimal pool size based on your application's expected load.
• Connection Handling: Release connections back to the pool using the release() method.
• Connection End: Close connections manually if they are no longer needed, even if released back to the pool.

Returning a Connection from the Pool

To simplify connection retrieval, modify the mysql module to return a function that retrieves a connection:

var getConnection = function (callback) {
    pool.getConnection(function (err, connection) {
        callback(err, connection);
    });
};

module.exports = getConnection;

This allows you to obtain connections directly:

var getConnection = require('../db/mysql');

getConnection(function (err, connection) {
    // Use the connection...
});

The above is the detailed content of How Does Connection Pooling with Node.js and MySQL Boost Your Application's Performance?. For more information, please follow other related articles on the PHP Chinese website!