Using DBI instead of shelling out will save your sanity and also that of anyone else who has to maintain your code. Here is an untested example to give you the gist:

#!/usr/bin/env perl 
use strict;
use warnings;
use DBI;

my $dbh = DBI->connect ('DBI:mysql:database=DB1') or die $DBI::errstr;

my $basequery = 'SELECT count(id_) FROM jbpm_taskinstance';
my @where = (
    q#WHERE isopen_ IS TRUE AND actorid_ IS NOT NULL#,
    q#WHERE create_>(SELECT DATE_ADD(NOW(), INTERVAL '-3' HOUR))#,
);

for my $thiswhere (@where) {
    my ($qty) = $dbh->selectrow_array ("$basequery $thiswhere");
    print "Count $thiswhere is $qty\n";
}
$dbh->disconnect;

[download]

In reply to Re: storing queries in an array and execute by hippo
in thread storing queries in an array and execute by kaka_2

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.