cleanup code

html/src/service/sqlite.js

@@ -1,16 +1,20 @@
 // requires binding of SQLite
 
-function execute(callback, sql, args = null) {
-    return new Promise(function (resolve, reject) {
-        SQLite.Execute(callback, resolve, reject, sql, args)
-    });
+class SQLiteService {
+    execute(callback, sql, args = null) {
+        return new Promise((resolve, reject) => {
+            SQLite.Execute(callback, resolve, reject, sql, args);
+        });
+    }
+
+    executeNonQuery(sql, args = null) {
+        return SQLite.ExecuteNonQuery(sql, args);
+    }
 }
 
-function executeNonQuery(sql, args = null) {
-    return SQLite.ExecuteNonQuery(sql, args);
-}
+var self = new SQLiteService();
 
-export default {
-    execute,
-    executeNonQuery
+export {
+    self as default,
+    SQLiteService
 };