Question

Here are my codes:

app.get('/index/:name',function(req, res){
    connection.query('SELECT * FROM deneme',function(err, rows, fields){
        if (err) throw err;
        var paragraf = rows;
    });

    res.render('index', {
        title: req.params.name,
        para: paragraf
    });
});

But node can’t reach ‘paragraf’ variable from inside of ‘res.render’. Node returns

ReferenceError: paragraf is not defined

How can i reach paragraf variable from outside of asynchronous functio?

Answer 1

This is not how an asynchronous method result is supposed to be used, because the rows will not be available until the query callback is called.

Try instead:

app.get('/index/:name', function(req, res){
    connection.query('SELECT * FROM deneme', function(err, rows, fields){
        ...

        res.render('index', {
            title: req.params.name,
            para: rows
        });
    });
});

This way you access and render the results (rows) once they are available.