Sometimes I keep the placeholders in an array to mention them...

I haven't yet found a coding style for placeholders with which I'm completely happy.

For a simple query I just keep them inline: 

my $row = $dbh->selectrow_hashref("SELECT * FROM table WHERE idTable =
+ ?", under, $id);

[download]
But for more placeholders I've tried this: 
my $row = $dbh->selectrow_array("SELECT * FROM table WHERE idTable = ?
+ AND some_column = ? AND another_column = ? AND name = ?", under,
    $table_id,
    $column_data,
    $column_info,
    $name);

[download]
IMHO that is too spread out. So instead I generally adopt this way if I have lots of placeholders. 
my $row = $dbh->selectrow_array("SELECT * FROM table WHERE idTable = ?
+ AND some_column = ? AND another_column = ? AND name = ?", under,
    $table_id, $column_data, $column_info, $name);

[download]
Or, if there are silly numbers of placeholders, I will preload them into an array and just pass that to the DBI method.

In reply to Re^4: DBI and JSON fields by Bod
in thread DBI and JSON fields by Bod

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.