[英]How do I get pqxx (the C++ API for Postgres) to work when my database authentication requires a password?
I installed C++, Postgres, and postgresql-devel on CentOS 7.3. 我在CentOS 7.3上安装了C ++,Postgres和postgresql-devel。 I installed libpqxx-4.0 too.
我也安装了libpqxx-4.0。
I then created this add_employee.cxx file and based it on the "brief example" here . 然后,我创建了这个add_employee.cxx文件,并基于此处的“简短示例”。
#include <iostream>
#include <pqxx/pqxx>
int main(int, char *argv[])
{
pqxx::connection c("dbname=foobar user=jdoe password=smartpassword");
pqxx::work txn(c);
pqxx::result r = txn.exec(
"SELECT id "
"FROM Employee "
"WHERE name =" + txn.quote(argv[1]));
if (r.size() != 1)
{
std::cerr
<< "Expected 1 employee with name " << argv[1] << ", "
<< "but found " << r.size() << std::endl;
return 1;
}
int employee_id = r[0][0].as<int>();
std::cout << "Updating employee #" << employee_id << std::endl;
txn.exec(
"UPDATE EMPLOYEE "
"SET salary = salary + 1 "
"WHERE id = " + txn.quote(employee_id));
txn.commit();
}
I compiled it with this: 我用这个编译它:
c++ add_employee.cxx -lpqxx -lpq
I ran ./a.out and saw this: 我跑了出去,看到了:
terminate called after throwing an instance of 'pqxx::broken_connection' what(): FATAL: Peer authentication failed for user "foobar"
引发'pqxx :: broken_connection'what()实例后终止调用:致命:用户“ foobar”的对等身份验证失败
Aborted
中止
I normally need a password for the database role "jdoe" to log in. What do I do to get around the error? 通常,数据库角色“ jdoe”需要密码才能登录。如何解决该错误? I want to have a C++ program log in automatically.
我想让一个C ++程序自动登录。 I do not have passwordless authentication into the database.
我没有无密码身份验证进入数据库。 Is there a way to have this C++ program log into the Postgres database despite requiring a password?
尽管需要密码,有没有办法让此C ++程序登录到Postgres数据库?
I suspect this has little to do with your C++ code, and more with you the server is set up. 我怀疑这与您的C ++代码无关,而更多与服务器设置有关。
As I recall, API access always goes over the network so make sure you pg_hba.conf
file is correct. 我记得,API访问总是通过网络进行的,因此请确保
pg_hba.conf
文件正确。
One way I found useful for testing: access from another machine on the same local network. 我发现对测试有用的一种方法:从同一局域网中的另一台计算机进行访问。
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