If you put the constants/subs to be exported into @EXPORT_OK, they will only be exported to the caller's namespace if the caller requests them on the use line: 

use MyConstants qw/LOGIN PASS IP DB_NAME/;
...

[download]

Note: I've renamed your package to MyConstants. Two reasons:

  1. All lowercase package names are notionally reserved for pragmas (system defined packages).
  2. constant is already used for the pragma you are using to define your constants.

If you are sure that you always want to export those constants, then you can alternatively add them to @EXPORT, and they will exported into every namespace that uses the module. This is vagely frowned upon as it doesn't give any clue as to where they came from in the calling code, but in the case of constants and a package called MyConstants or similar, it would probably be acceptable to most people. Expecially if there are a lot of constants that will usually need to be imported.

Update: Corrected s/@EXPORTS/@EXPORT/ courtesy of ysth.

Examine what is said, not who speaks.
"But you should never overestimate the ingenuity of the sceptics to come up with a counter-argument." -Myles Allen
"Think for yourself!" - Abigail        "Time is a poor substitute for thought"--theorbtwo         "Efficiency is intelligent laziness." -David Dunham
"Memory, processor, disk in that order on the hardware side. Algorithm, algorithm, algorithm on the code side." - tachyon

In reply to Re: inheritance of constants by BrowserUk
in thread inheritance of constants by mat21

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.