Beefy Boxes and Bandwidth Generously Provided by pair Networks
Clear questions and runnable code
get the best and fastest answer

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??
But my thinking isn't clear, any ideas?

I guess you are looking for feedback on the design, not the implementation. So here are some thoughts:

  • If stuff is bound to variable $email, the variable should appear like that in the select statement
  • Interpolation of variables should probably still be possible, so you need some syntax beyond just the variable name to make it clear which variables are bind variables and which ones are interpolated
  • SQL column names and column expressions are not confined to Perl identifiers, so you need some (optional) syntax for aliasing non-perl-identifier column descriptions to Perl variables

Given these constraints, I'd propose something along the lines of

$dbh->SELECT(':$name, :$email, :$duration(from - to) FROM table WHERE +duration > $min_duration' { say "$name <$email> has spent $duration days here"; }

Which would desugar to something like

$dbh->prepare('SELECT name, email, from - to AS duration FROM table WH +ERE duration > ?'); $dbh->bind_columns(\my ($name, $email, $duration); $dbh->execute($min_duration); while ($sth->fetch) { say "$name <$email> has spent $duration days here"; }

Maybe you also want to add another syntax for interpolating variables that are piped through $dbh->quote_identifer instead of placeholders, for when you need to interpolate the table name.

In reply to Re: Devel::Declare type syntactic sugar for DBI select bind_col param by moritz
in thread Devel::Declare type syntactic sugar for DBI select bind_col param by Anonymous Monk

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?

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

    How do I use this? | Other CB clients
    Other Users?
    Others browsing the Monastery: (8)
    As of 2015-03-27 05:59 GMT
    Find Nodes?
      Voting Booth?

      When putting a smiley right before a closing parenthesis, do you:

      Results (599 votes), past polls