mysql节点js -在连接失败时不继续执行下一条语句，并退出代码

npm install mysql

const mysql = require('mysql');

const connection = mysql.createConnection({
  host: 'localhost',
  user: 'root',
  password: 'password',
  database: 'mydatabase'
});

connection.connect((err) => {
  if (err) {
    console.error('Error connecting to MySQL database: ' + err.stack);
    process.exit(1); // 退出代码，停止执行后续语句
  }
  console.log('Connected to MySQL database');
});

connection.query('SELECT * FROM users', (err, results) => {
  if (err) {
    console.error('Error executing query: ' + err.stack);
    process.exit(1); // 退出代码，停止执行后续语句
  }
  console.log('Query results:', results);
});

connection.end((err) => {
  if (err) {
    console.error('Error closing database connection: ' + err.stack);
    process.exit(1); // 退出代码，停止执行后续语句
  }
  console.log('Database connection closed');
});