Obtain some column data from influxdb to make a sum and save it again

I'm trying to obtain a value from a column call 'count', and increment the value, then save it again with other information, i have something like this in influx:

var qCount = 'select max(count) from ' + config.name +
        ' where itemType = \'' + config.data.item + '\'';

    db.query(qCount);
count += 1;

When i obtain the value i want to increase it in in one value like, count + 1 and save it to the database.

Is it posible?

Thanks