> I want to ask why data property value "win" does not have default zero
> value? If it was zero, team1.getPropertyValue() would not flush exception
> error message?
Which exception do you mean? There is no exception thrown but NULL
returned. Please show the code and do not ignore this again. Andy also
asked you for code.
And as Adam said, information in RDF can be "unknown". Moreover, it is
schema-less, and it's not a relational database with default values.
>
> On Sun, Nov 6, 2016 at 4:44 PM, Lorenz B. <
> [email protected]> wrote:
>
>> Comments inline:
>>> Hi
>>> I want to get the property value and then add add/sum 2 for each team
>> with
>>> it.
>>> team1(win value +2) // value is 2 here
>>> team1(win value +2) // value is 4 here
>>>
>>> team.getPropertyValue(Win);
>>> //then next operation to get value and sum 2
>>>
>>> But the issue is I get error as I have not set the value first.
>> Which "error" do you get? According to [1] it returns null if there
>> hasn't been a value set before.
>> Java allows for
>>
>> if(something) {
>> // do something
>> }
>>
>> [1]
>> https://jena.apache.org/documentation/javadoc/jena/
>> org/apache/jena/ontology/OntResource.html#getPropertyValue-org.apache.
>> jena.rdf.model.Property-
>>> But if I
>>> set value before get the value, the property "win" always show that value
>>> and not after calculated value.
>>> Is there any way for this issue?
>> Using an Integer variable in Java that holds the value before if exists,
>> else 0 ... ?
>>
>> --
>> Lorenz Bühmann
>> AKSW group, University of Leipzig
>> Group: http://aksw.org - semantic web research center
>>
>>
>>
--
Lorenz Bühmann
AKSW group, University of Leipzig
Group: http://aksw.org - semantic web research center
