try {
            if( !window.openDatabase) {
                console.log('SQLite is not supported by this browser');
            }
            else {
                db = openDatabase('MyMobileDb', '1.0', 'MyMobileDb', 65536);
                if (doreset)
                {
                    //my drop and reset DB function
                } else
                {
                    //my init DB function
                }
            }
        }
        catch(e) {
            console.log(e);
        }

// Initialise local db
var mydb = new DbConnection().getDb();

mydb.transaction(function(transaction){
  transaction.executeSql(...