db.transaction(function(tx){
                    tx.executeSql('CREATE TABLE IF NOT EXISTS settings(key TEXT UNIQUE, value TEXT)');
                    var table  = tx.executeSql("SELECT * FROM settings");
                    // Insert default values
                    if (table.rows.length === 0) {
                        tx.executeSql('INSERT INTO settings VALUES(?, ?)', ["region", qsTr("1")]);
                        tx.executeSql('INSERT INTO settings VALUES(?, ?)', ["forecastIndex", 0]);
                        tx.executeSql('INSERT INTO settings VALUES(?, ?)', ["hidePush", 1]);
                    };
                });

var table  = tx.executeSql("SELECT * FROM settings");
if (table.rows.length === 0) {
...
}

function getSetting(key) {
            openDB();
            var res = "";
            db.transaction(function(tx) {
                var rs = tx.executeSql('SELECT value FROM settings WHERE key=?;', [key]);
                res = rs.rows.item(0).value;
            });
            return res;

        Component.onCompleted: {
            region = getSetting('region');
            forecastIndex = getSetting('forecastIndex');
            hidePush = getSetting('hidePush');
        }