update method
Implementation
@override
Future<int> update(
String table,
Map<String, dynamic> values,
String whereClause,
List<dynamic> whereArgs,
) async {
final setClause = values.keys.map((k) => '$k = ?').join(', ');
final sql = 'UPDATE $table SET $setClause WHERE $whereClause';
final params = [...values.values, ...whereArgs];
db.execute(sql, params);
return db.getUpdatedRows();
}