public PostagemRepositorio()
 {
     ConexaoSite conexao = new ConexaoSite();
     db = new SiteColegioDB(new MySqlConnection(conexao.ToString()));
 }
        public PostagemRepositorio()
        {
            ConexaoSite conexao = new ConexaoSite();

            db = new SiteColegioDB(new MySqlConnection(conexao.ToString()));
        }