Re: [Semediawiki-user] How to get property values from SMW (Was: The right type for storing IP addresses)

[Yury K. <kat...@gm...>]

I got it, thank you Markus and Jeroen!

I used to use the cleaner way (not as clean as Markus recommend
though) of getting the property values and even once documented that
here: [1]. However since my last visit some of the methods got
deprecated and some got removed.

If I can make a suggestion: that would be very cool if we have some
kind of programming API in SMW for extension developers. It can be
just a set of classes that are not likely to change very much and on
which the third-party developers can rely on. I understand how busy
core developers are, but such API can increase the number of SMW-based
extensions and, in the future, the number of core developers.

And of course if anybody continues to work on Architecture Guide that
would be terrific!

[1] http://semantic-mediawiki.org/wiki/User:Yury_Katkov/programming_examples


-----
Yury Katkov



On Tue, Aug 7, 2012 at 1:34 PM, Markus Krötzsch
<ma...@se...> wrote:
> On 06/08/12 15:59, Yury Katkov wrote:
>>
>> Hi Jeroen!
>>
>> Each piece of programming documentation is as valuable as gold! Please do.
>> I've spent about two days recently before I figured out these two
>> lines that allow to want the value of the semantic property.
>>
>>   $params = array ("[[Pagename]]", "?ExampleProperty=", "mainlabel=-");
>>   $result = SMWQueryProcessor::getResultFromFunctionParams( $params,
>> SMW_OUTPUT_WIKI );
>
>
> The above is a very complicated way to get the data you want (constructing a
> whole query with printouts to get a single data value). It's short, but it
> invokes all kinds of string-based parsing that may not be needed. Instead,
> you can do:
>
> // Assuming that you have the names of page and property fixed:
> // (all strings are DBKeys, that is, use '_' instead of ' ')
> $propertyDi = new SMWDIProperty( 'ExampleProperty' );
> $pageDi = new SMWDIWikiPage( 'Pagename', NS_MAIN, '' );
> $valueDis = smwfGetStore()->getPropertyValues( $pageDi, $propertyDi );
> // $valueDis now is an array of all property values, given as DI objects
>
> // To create DV objects:
> foreach ( $valueDis as $valueDi ) {
>         $valueDv = SMWDataValueFactory::newDataItemValue( $valueDi,
> $propertyDi );
> // do something ...
> }
>
> If page or property name comes from user input, then you can do something
> like:
>
> $propertyDv = SMWDataValueFactory::newTypeIdValue( '__pro', $propertyName );
> $pageDv = SMWDataValueFactory::newTypeIdValue( '_wpg', $pageName );
>
> and then call getDataItem() to get the DIs. The strings '__pro' and '_wpg'
> are the type ids that control how SMW will handle the string to create a
> suitable DV object. You can see all builtin type ids in SMWDatavalueFactory,
> if you want to know this for other datatypes as well. However, if you have
> "clean" internal values, you can always create DI objects directly, rather
> than parsing them from a string.
>
> Please take advantage of the devel list for such questions :-)
>
> Cheers,
>
> Markus
>
>
>>
>> I'm pretty sure that making custom datatypes is pretty common task and
>> not only I will find your docs useful.
>> -----
>> Yury Katkov
>>
>>
>>
>>
>> On Mon, Aug 6, 2012 at 5:47 PM, Jeroen De Dauw <jer...@gm...>
>> wrote:
>>>
>>>
>>> Hey,
>>>
>>>> The sorting is not ideal, but of course there's no "IP address" type,
>>>
>>> which is what would be required here.
>>>
>>> It's pretty trivial to create a DataValue for this, which is all that's
>>> needed to have such a build in type. If anyone is interested in doing the
>>> little programming work, I can write up some docs :)
>>>
>>> Cheers
>>>
>>> --
>>> Jeroen De Dauw
>>> http://www.bn2vs.com
>>> Don't panic. Don't be evil.
>>> --
>>>
>>> ------------------------------------------------------------------------------
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>>> _______________________________________________
>>> Semediawiki-user mailing list
>>> Sem...@li...
>>> https://lists.sourceforge.net/lists/listinfo/semediawiki-user
>>
>>
>>
>> ------------------------------------------------------------------------------
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>> Exclusive live event will cover all the ways today's security and
>> threat landscape has changed and how IT managers can respond. Discussions
>> will include endpoint security, mobile security and the latest in malware
>> threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
>> _______________________________________________
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>
>