there is my problem :
{
const row_nb = con.query("SELECT COUNT(*) FROM Users WHERE username = '"+username_ins+"'");
console.log(""+row_nb);
}
but I dont have the row number why ? it return [Object object] And it's in javaScript
con.query
is an async method you have to pass the callback to get the result.
var sql = "SELECT COUNT(*) as usersCount FROM Users WHERE username = ?"
con.query(sql, [username_ins], function(err, rows, fields) {
if (err) throw err;
console.log('Query result: ', rows[0].usersCount);
});