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This is ajax returned by connecting to mysql from node.
However, the resulting value is not output.

What is the problem?

What I have tried:

var http = require('http');
var url = require('url');

var db_config = require('mysql.js');

let mysqld = {} // mysql result
app.get('/server', function(req, res){

   let num = req.query.pID;
   let sql = 'select * from wt_serials where id=?';

   let params = [num];
   let conn = db_config.init();


   conn.query(sql, params, function(err, rows, fields){
      mysqld = JSON.stringify(rows);
      console.log('1 '+mysqld); // result is corrent

    console.log('2 '+mysqld);  // result is [object Object]
    rss.json(mysqld);  // empty

ajax result is {}
Updated 19-May-22 22:01pm

1 solution

Given the fact that you're passing a callback function to the query function, it's safe to assume that it's running asynchronously. The data won't be available until the callback function is called.

You'll either need to rewrite your code to use the data inside the callback, or find a way to make the code async using a promise[^].
Chopin2001 20-May-22 5:07am
Thanks Richard Deeming

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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