DBI->connect() will return undef if the connection failed, so you can call first one, then another on failure by, 

my $dbh = DBI->connect(@pref_args) || DBI->connect(@alt_args)
    or die $DBI::errstr;

[download]
You will want to avoid setting RaiseError or PrintError in the connect calls. Set those you want as soon as convenient after connecting.

Your error message suggests that your connection may be failing due to bad arguments. I'm not positive of that, but it's worth checking.

The $dbh->ping method is handy for checking if a connection is still alive, once made.

After Compline,
Zaxo

In reply to Re: how to test a connection with mysql db by Zaxo
in thread how to test a connection with mysql db by jeanluca

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.