LocalStorage not working with qtquickcompiler

.pragma library
.import QtQuick.LocalStorage 2.0 as Sql

var db = null

function connectToDB() {
    db = Sql.LocalStorage.openDatabaseSync("Test4", "1.0",
                                           "Local test Data", 1000000)
    if (db) {
        db.transaction(function (tx) {
            tx.executeSql(
                        'CREATE TABLE IF NOT EXISTS Table1(id NUMBER, str TEXT)')
        })
    }
}