From what I understand about packages, namespaces and scope, you're missing two things:

• $get_data_sub should be declared with our, as in:

  % perl -wle'package foo; our $bar = "10"; package main; print $foo::ba
  +r'
  10
  [download]

  Trying the same with my will result in a warning when you try to print an uninitialized variable.


• in your addbook package, add the correct sigil to the variable, i.e. $DbManager::get_db_data

Hope this helps.

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