Beefy Boxes and Bandwidth Generously Provided by pair Networks
Problems? Is your data what you think it is?
 
PerlMonks  

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??

I think you'll find the enlightenment you're after in perlreftut - Mark's very short tutorial about references.

When you called $rows = $dbh->selectall_arrayref, DBI returned a single scalar value which you assigned to $rows. That value was a reference to an array. Each element in that array was a reference to a hash of column names and values.

The array-dereferencing syntax you quoted:

$ { $array_ref } [2]

is exactly equivalent to this syntax:

$array_ref->[2]

And in your case would return a hashref.

my $hash_ref = $array_ref->[2]; my $value = $hashref->{$key};

You can also chain together the dereferencing like this:

my $value = $array_ref->[2]->{$key};

And you can even omit the arrow when the initial data structure contains references:

my $value = $array_ref->[2]{$key};

In reply to Re: How does DBI return an arrayref with key/value pairs? by grantm
in thread How does DBI return an arrayref with key/value pairs? by walkingthecow

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!
  • 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, 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, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • Outside of code tags, you may need to use entities for some characters:
            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.
  • Log In?
    Username:
    Password:

    What's my password?
    Create A New User
    Chatterbox?
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others chilling in the Monastery: (13)
    As of 2014-07-29 17:56 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      My favorite superfluous repetitious redundant duplicative phrase is:









      Results (225 votes), past polls