addObject method
Implementation
Future<int> addObject(
{required String table, required Map<String, Object?> keyValues}) async {
List<(String, String)> kvs =
keyValues.entries.where((element) => element.value != null).map((e) {
return _tableKV(e.key, e.value);
}).toList();
String key = kvs.map((item) => item.$1).join(',');
String value = kvs.map((item) => item.$2).join(',');
return rawUpdate('insert into $table ($key) values ($value)');
}