async.waterfall([
    function (callback) {
        connection.connect(callback)
    },
    function (callback) {
        connection.query(sqlFindMobile, [req.body.mobile], callback)
    },
    function (results, callback) {
        console.log("mobile query");
        connection.query(sqlNewUser, [req.body.password], callback)
    },
    function (results) {
        console.log("added user");
        var user_id = results.insertId;
        connection.query(sqlNewMobile, [user_id, req.body.mobile], callback)
    },
],
function (err, result) {
    connection.end()
    if (err) {
        throw err
    }
    console.log("added mobile");
})