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。

汇编:
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];

当我删除此行时,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;
  }
}

最佳答案

不确定...但是如果我正确理解this page,则必须将pqxx::tuple替换为pqxx::row

所以,我想

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

09-20 11:04