How to make a query in mysql?

Question

Express.js

module.exports = {
  addAnnPage: (req, res) => {
        res.render('add-ann.ejs', {
            title: "Welcome | Add a new"
            ,message: ''
        });
    },
    addAnn: (req, res) => {

        let first_name = req.body.first_name;
        let last_name = req.body.last_name;
        let number = req.body.number;
        let auto = req.body.auto;
        let info = req.body.info;
        let price = req.body.price;
        let usernameQuery = "SELECT * FROM `ann` WHERE first_name = '" + first_name + "'";
        db.query("INSERT INTO `ann` (first_name, last_name, number, info, price, auto) VALUES ('"+first_name + "', '" + last_name + "', '" + number + "', '" + info + "', '" + price + "', '" + auto + "')", function(err, info) {
    console.log(info.insertId);
});
     }
 }

In the database, after sending the request, undefined appears in the fields

Answer 1

Check what comes in req.body.