Hi Monks
I am currently working on a program that retrieves results from a database. However when my program retrieves a null result, instead of printing a dash ('-') as I would like it to, it prints the error "Use of uninitialized value".
My question is how do I print out a dash each place there is a null?

my $dbh = DBI->connect('DBI:DB2:dbname', 'username', 'password.')
    or die "Couldn't open database: $DBI::errstr; stopped";

#Prepare the SQL query for execution
my $sth = $dbh->prepare(<<End_SQL) or die "Couldn't prepare statement:
+ $DBI::errstr; stopped";
SELECT values FROM table;
End_SQL

# Execute the query
$sth->execute() or die "Couldn't execute statement: $DBI::errstr; stop
+ped";

# Fetch each row and print it
while ( my (@result) = $sth->fetchrow_array() ) {
        my $result_to_print = join(",",@result);
        print $result_to_print . "\n";
        }

# Disconnect from the database
$dbh->disconnect();

[download]

j o h n i r l .

Sum day soon I'Il lern how 2 spelI (nad tYpe)

In reply to Substituting '--' for Nulls by johnirl

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.