mysql Nodejs pool.getConnection返回未定义的

我正在尝试使用异步等待语法重新创建mysql Nodejs事务。这是文档在没有async/await的情况下显示的内容：

connection.beginTransaction(function(err) {
  if (err) { throw err; }
  connection.query('INSERT INTO posts SET title=?', title, function (error, results, fields) {
    if (error) {
      return connection.rollback(function() {
        throw error;
      });
    }

    var log = 'Post ' + results.insertId + ' added';

    connection.query('INSERT INTO log SET data=?', log, function (error, results, fields) {
      if (error) {
        return connection.rollback(function() {
          throw error;
        });
      }
      connection.commit(function(err) {
        if (err) {
          return connection.rollback(function() {
            throw err;
          });
        }
        console.log('success!');
      });
    });
  });
});

我已经创建了一个异步

池

，可以与async await一起使用：

let util=require('util')

let pool = mysql.createPool({
    connectionLimit: 20,
    host: keys.connection.host,
    user: keys.connection.user,
    password: keys.connection.password,
    database: keys.connection.database,
    dateStrings: true 
    // debug:true                //Set this to true for verbose debugging. Leaving this to default for now cause it is creating too many messages at my console
})
pool.getConnection((err, connection) => {
    if (err) {
        if (err.code === 'PROTOCOL_CONNECTION_LOST') {
            console.error('Database connection was closed.')
        }
        if (err.code === 'ER_CON_COUNT_ERROR') {
            console.error('Database has too many connections.')
        }
        if (err.code === 'ECONNREFUSED') {
            console.error('Database connection was refused.')
        }
    }
    if (connection) connection.release()
    return
})

pool.query = util.promisify(pool.query)

module.exports = pool

要将文档转换为async/await，我尝试执行以下操作：

const connection = await pool.getConnection();
await connection.beginTransaction();

但我得到了：

TypeError:无法读取未定义的属性“beginTransaction”

---

这回答了你的问题吗？在将代码从mariadb移植到mysql时也会得到同样的结果。使用异步调用getConnection返回未定义的