@Override
  public int criarPost(Post post) {

    try {
      int codigo = 0;
      String sql = "insert into Post(idBlog, usuarioLogin, titulo, texto)" + " values (?,?,?,?)";
      String sqlRecuperaCodigo = "select max(cod) from Post";

      PreparedStatement ps = con.prepareStatement(sql);
      ps.setInt(1, post.getBlog().getId());
      ps.setString(2, post.getUsuario().getLogin());
      ps.setString(3, post.getTitulo());
      ps.setString(4, post.getTexto());
      ps.executeUpdate();

      ps = con.prepareStatement(sqlRecuperaCodigo);
      ResultSet rs = ps.executeQuery();
      if (rs.next()) {
        codigo = rs.getInt(1);
      }
      ps.close();
      con.close();
      return codigo;
    } catch (SQLException e) {
      e.printStackTrace();
      throw new RuntimeException("Falha ao criar post em JDBCPostDAO", e);
    }
  }