Re: EOQualifier to qualify NSTimestamp by month
Re: EOQualifier to qualify NSTimestamp by month
- Subject: Re: EOQualifier to qualify NSTimestamp by month
- From: Chuck Hill <email@hidden>
- Date: Tue, 1 Jun 2010 15:53:33 -0700
On Jun 1, 2010, at 3:30 PM, Joe Kramer wrote:
Hi all,
I may be barking up the wrong tree here, but I wanted someone to
confirm that for me. I have a simple Person EO with a NSTimestamp
attribute for birthdate. I'm wondering if it is possible to create
a qualifier to get all the people whose birthday is in a particular
month (May, for example). The year doesn't matter so I can't do a
simple ">" or "<". If this isn't possible (or efficient) I can
change the data model to capture the birth month separately. Then I
can just set the month programatically when a new person is created
and use that value as the qualifier. Just curious what others think.
Define "possible". :-P The SQL way is
select extract(MONTH from col_name) from table_name;
So you could write a custom qualifier to do this. Generally, writing
qualifiers ranks as "non trivial". I don't know of an existing
qualifier that you can use. Depending on your needs, SQL might be the
way to go. See EOSQLQualifier JavaDocs.
Chuck
--
Chuck Hill Senior Consultant / VP Development
Practical WebObjects - for developers who want to increase their
overall knowledge of WebObjects or who are trying to solve specific
problems.
http://www.global-village.net/products/practical_webobjects
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