You just check and see if $@ gets set after the eval block. See eval doc page

eval 
{
   some db command
   $dbh->do....;
}
if ($@)
{
   print "$@\n";
   print $DBI::Errstr,"\n";
}

[download]
do some experimenting, $@ may be same as the dbi's error string if PrintError =1.

In reply to Re^5: Capturing error thrown by a database by Marshall
in thread Capturing error thrown by a database by puneet.keswani

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