The problem is you call the subroutine as a class method:
MyDB->get_transaction(10000);

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Therefore, the first argument to the subroutine is not the id, but the class name. Insert the following line to the top of the sub:
my $class = shift;

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لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ

In reply to Re: returning a hash from a module by choroba
in thread returning a hash from a module by jms53

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