何时使用node-mysql模块打开连接？

npm install mysql

const mysql = require('mysql');

const connection = mysql.createConnection({
  host: 'localhost',
  user: 'your-username',
  password: 'your-password',
  database: 'your-database-name'
});

connection.connect((error) => {
  if (error) {
    console.error('Error connecting to the database:', error);
    return;
  }
  console.log('Connected to the database');
});

process.on('exit', () => {
  connection.end();
});