c++ - 如何使用 mysql++ 或其他库检索列？

Question

首先，我是 C++ 新手；现在，我正在尝试编写一个项目来监听任何数据库更改MySQL binlog并做一些事情。我选择了一个名为mysql-binlog-repliation的库，按照它的示例代码，现在我可以跟踪事件MySQL binlog，检索旧值和新值。但是，我无法检索列，我想知道如何检索列和值，感谢任何有用的答案！

以下是我的部分代码：

while (true) {
int result = binlog.wait_for_next_event(&event);
if (result == ERR_EOF)
  break;
std::cout << "Found event of type " << event->get_event_type();
int event_type = event->get_event_type();
if (event_type == mysql::TABLE_MAP_EVENT) {
  tmev = (mysql::Table_map_event *)event;
  std::string tablename=tmev->table_name;
}
if (event_type == mysql::WRITE_ROWS_EVENT || event_type==mysql::UPDATE_ROWS_EVENT || event_type==mysql::DELETE_ROWS_EVENT) {
  mysql::Row_event *row_event = (mysql::Row_event *)event;

  mysql::Row_event_set rows(row_event, tmev);
  mysql::Row_event_set::iterator itor = rows.begin();
  do {
    mysql::Row_of_fields fields = *itor;

    mysql::Row_of_fields::iterator it = fields.begin();
    // Here,fields represent values,I have no way to get columns
    do {
      std::string out;
      converter.to(out, *it);
      std::cout << "\t" << out;
    } while (++it != fields.end());
  } while (++itor != rows.end());
}
std::cout << std::endl;