Why does my DBI program complain about 'Undefined subroutine &DBD::Pg::db::_login'?

Question

Hi,

I am trying to use PostgreSQL database for storing Apache's session information, but I can't get it to work. It is failing with the following error:

 Undefined subroutine &DBD::Pg::db::_login

It seems that MySQL users have run into the same problem in DBD::MySQL::db. I have the latest CPAN version of both DBI and DBD::Pg. It doesn't seem that the _login function is there in the module. Any ideas how to get around this problem? I appreciate your help!

Thanks

Answer 1

Browsing back through the history, there has never been a Perl method named _login defined in the package DBD::Pg::db (which is defined in Pg.pm), and the invocation is explicitly DBD::Pg::db::_login().

This is a guess, but I think that _login is a C function that's bound through XS, and that's why you can't find its source in the module. That would indicate some problem with the Postgres library that it's trying to use.