使用导出连接到动态数据库node.js

const mysql = require('mysql');

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

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

connection.query('SELECT * FROM table_name', (err, results) => {
  if (err) {
    console.error('Error executing query: ', err);
    return;
  }
  console.log('Query results: ', results);
});

connection.end((err) => {
  if (err) {
    console.error('Error closing database connection: ', err);
    return;
  }
  console.log('Database connection closed.');
});