Hey everyone,
I've just started using class-dbi for some work stuff and I'm still trying to get used to some of its functionality. The problem I'm having is getting a column value updated to a NULL value.

In the webapp update form, when a value from a particular field is removed, I need the corresponding value for that field value in the database to be set to NULL. I'm updating the value as per class-dbi: 
$case->owner( $q->param('owner') );
.....
$case->update;

[download]
However, this sets the value to an empty, non-null value which will cause a search on NULL to fail. If I put NULL as a value in the code, I get the bareword error: 
$case->owner(NULL);
.....
$case->update;

[download]
I've made the following changes in the class file to hack a workaround: 
Handoff::Cases->set_sql('unowned', qq{SELECT * FROM cases 
                                      WHERE owner IS NULL

[download]
to 
Handoff::Cases->set_sql('unowned', qq{SELECT * FROM cases 
                                      WHERE owner IS NULL OR owner=''

[download]
This hack will make it work for my application, but it breaks other applications that require a NULL value in the field since the field does not, in fact, have a NULL value. There's got to be a way to do it. I just don't know what it is.

As always your assistance is much appreciated.
davidj

In reply to class-dbi-mysql and null values by davidj

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.