SQLite function to return rowid on INSERT

[KeineAhnung]

Hi,

I would like to write a function within my QML project that inserts data into a SQLite table and returns the rowid of the inserted line on success.
This is what i got so far:

function saveData(name, mode, adjust) {
    var db = getDatabase();
    var res = "";
    db.transaction(function(tx) {
        var rs = tx.executeSql('INSERT INTO profiles ' +
                               'VALUES (?,?,?);', [name, mode, adjust]);
        if (rs.rowsAffected > 0) {
            res = tx.executeSql('SELECT last_insert_rowid();');
        } else {
            res = "Error";
        }
    });
    console.log(res)
    return res;
}

function saveData(name, mode, adjust) {
    var db = getDatabase();
    var res = "";
    db.transaction(function(tx) {
        var rs = tx.executeSql('INSERT INTO profiles ' +
                               'VALUES (?,?,?);', [name, mode, adjust]);
        if (rs.rowsAffected > 0) {
            res = tx.executeSql('SELECT last_insert_rowid();');
        } else {
            res = "Error";
        }
    });
    console.log(res)
    return res;
}

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But I do net get an integer back, I get an object. How is this done right and is there a better way to do it than what I tried?

Thanks.