Re: EOQualifier to qualify NSTimestamp by month
Re: EOQualifier to qualify NSTimestamp by month
- Subject: Re: EOQualifier to qualify NSTimestamp by month
- From: Mike Schrag <email@hidden>
- Date: Wed, 2 Jun 2010 10:45:23 -0400
you never responded to my comment btw :)
ms
On Jun 2, 2010, at 10:38 AM, Kieran Kelleher wrote:
> 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
>>>>
>>>> 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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>>>
>>> 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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