如何在node.js中的模块之间共享连接池？

// connectionPool.js
const mysql = require('mysql');
const pool = mysql.createPool({
  host: 'localhost',
  user: 'username',
  password: 'password',
  database: 'database',
  connectionLimit: 10 // 设置连接池的最大连接数
});

module.exports = pool;

// module1.js
const pool = require('./connectionPool');

function queryData() {
  pool.getConnection((err, connection) => {
    if (err) {
      console.error('Error getting connection from pool:', err);
      return;
    }

    // 执行数据库操作
    connection.query('SELECT * FROM table', (error, results) => {
      connection.release(); // 释放连接
      if (error) {
        console.error('Error executing query:', error);
        return;
      }

      console.log('Query results:', results);
    });
  });
}

module.exports = { queryData };

// module2.js
const pool = require('./connectionPool');

function insertData(data) {
  pool.getConnection((err, connection) => {
    if (err) {
      console.error('Error getting connection from pool:', err);
      return;
    }

    // 执行数据库操作
    connection.query('INSERT INTO table SET ?', data, (error, results) => {
      connection.release(); // 释放连接
      if (error) {
        console.error('Error executing query:', error);
        return;
      }

      console.log('Insert results:', results);
    });
  });
}

module.exports = { insertData };