如何用javascript向数据库中的动态表添加不同的列

const mysql = require('mysql');

// 创建数据库连接
const connection = mysql.createConnection({
  host: 'localhost',
  user: 'root',
  password: 'password',
  database: 'mydatabase'
});

// 连接数据库
connection.connect();

// 创建动态表
const createTableQuery = 'CREATE TABLE mytable (id INT AUTO_INCREMENT PRIMARY KEY, name VARCHAR(255))';
connection.query(createTableQuery, (error, results, fields) => {
  if (error) throw error;
  console.log('Table created successfully');
});

// 添加动态列
const addColumnQuery = 'ALTER TABLE mytable ADD COLUMN new_column VARCHAR(255)';
connection.query(addColumnQuery, (error, results, fields) => {
  if (error) throw error;
  console.log('Column added successfully');
});

// 插入数据
const insertDataQuery = 'INSERT INTO mytable (name, new_column) VALUES (?, ?)';
const data = ['John Doe', 'Value for new column'];
connection.query(insertDataQuery, data, (error, results, fields) => {
  if (error) throw error;
  console.log('Data inserted successfully');
});

// 关闭数据库连接
connection.end();