libpqxx 库中没有 pqxx::tuple?

No pqxx::tuple in libpqxx library?

ve got the newest ubuntu and I已经完成:

sudo apt-get install postgresql postgresql-contrib
sudo apt-get install libpqxx-4.0v5
sudo apt-get install libpqxx-dev

我无法编译使用 pqxx::tuple 的程序。

编译:

g++ test.cpp -I/usr/local/include/ -lpqxx -lpq
or
g++ test.cpp -lpqxx -lpq -o test

控制台输出:

test.cpp: In function ‘int main()’:
test.cpp:15:21: error: ‘tuple’ in namespace ‘pqxx’ does not name a type
const pqxx::tuple row = r[rownum];

这是有问题的行:

const pqxx::tuple row = r[rownum];

当我删除这一行时,程序可以正常工作。

#include <iostream>
#include <pqxx/pqxx>
int main()
{
  try {
    pqxx::connection c("dbname=mydb user=postgres port=5432 password=*** hostaddr=127.0.0.1");
    pqxx::work w(c);
    pqxx::result r = w.exec("SELECT * FROM get_player_data_function()");
    w.commit();
    const int num_rows = r.size();
    for (int rownum=0; rownum < num_rows; ++rownum) {
        const pqxx::tuple row = r[rownum];
    }
  }
  catch (const std::exception &e) {
    std::cerr << e.what() << std::endl;
  }
}

不确定...但如果我理解正确 ,您必须将 pqxx::tuple 替换为 pqxx::row

所以,我想

const pqxx::row row = r[rownum];