koa2中用return await exec(sql).then(result => {return [0]})报错

Question

koa2 中用return await exec(sql).then(result => {return result[0]})
报错。
修改为 const result = await exec(sql); return result[0]即运行正确

Answer 1

提问者 qq_醒梦_0 2019-07-11 13:47:06

  <-- GET /api/user/login?username=zhangsan&password=123

select username,realname from users where username='zhangsan' and password =123

[ RowDataPacket { username: 'zhangsan', realname: '张三' } ]

  xxx GET /api/user/login?username=zhangsan&password=123 500 21ms -

server error TypeError: Cannot read property 'username' of undefined

    at router.get (E:\gitspace\iview_main\server\routes\login.js:12:11)

    at process.internalTickCallback (internal/process/next_tick.js:77:7) { request:

   { method: 'GET',

• 双越 #1

  Cannot read property 'username' of undefined ，找到这一行代码，然后继续往上追踪就是了。例如 username 是哪个变量的？这个变量如何赋值的，为何是 undefined ？顺着这个思路慢慢找。

Answer 2

双越 2019-07-11 13:31:11

报错信息是什么？