Re: EOQualifier to qualify NSTimestamp by month
Re: EOQualifier to qualify NSTimestamp by month
- Subject: Re: EOQualifier to qualify NSTimestamp by month
- From: Kieran Kelleher <email@hidden>
- Date: Wed, 2 Jun 2010 10:38:30 -0400
FYI, prototypes of derived columns don't exactly work in EntityModeler. So you need to write the derived prototype config on a piece of paper and recreate those derived attributes from your notes on that piece of paper instead ;-)
http://issues.objectstyle.org/jira/browse/WOL-1153
On Jun 1, 2010, at 7:35 PM, Chuck Hill wrote:
> Now there is a bit of smart thinking! Make it a prototype and you retain some measure of database independence.
>
> Chuck
>
>
> On Jun 1, 2010, at 4:20 PM, Johnny Miller wrote:
>
>> Could he follow your advice, about using SQL, and create a derived column in his model and then use a standard qualifier against the derived column?
>>
>> On Jun 1, 2010, at 12:53 PM, Chuck Hill wrote:
>>
>>>
>>> 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
>>>
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>>
>> Johnny Miller
>> Kahalawai Media Corp
>> http://www.kahalawai.com
>>
>>
>>
>
> --
> 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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