@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); } }