> Hello Lorenz, I tried to load the model from one owl file and then stored
> it to another file (though both files have same data, but different names).
> When I try to load model from owl file and store also into same file, it
> then works fine and data is not overwritten.
I don't understand. Does it work now?
As far as I know, data will be always be overwritten if you write to a
file as most RDF formats do not allow for something like appending data.
>
>
>
> On Fri, Dec 2, 2016 at 2:00 PM, Lorenz B. <
> [email protected]> wrote:
>
>>> If you really want to write each user to a separate file
>>>
>>> I dont want each user to a separate file, rather I want to save all the
>>> individuals/students in one file. Some times ago, it worked for me but I
>>> have made some changes to my code and now when I enter an individual, it
>>> replaces the existing one and hence saves only one at a time.
>>>
>>> I have checked the model before saving it to a file, and the model
>> contains
>>> only one individual (replaces existing one), so I think the problem is
>> not
>>> in the file saving itself.
>> As I said, you have to load the existing model from the existing file.
>> Then work on this model. Then save this model to disk to the same file.
>>>
>>>
>>> On Fri, Dec 2, 2016 at 12:23 PM, Claude Warren <[email protected]> wrote:
>>>
>>>> It sounds to me like Kumar is thinking that he needs to store each
>> student
>>>> in an individual file and load that. Kumar, if that is the case then I
>>>> think you misunderstand how the graph storage works. Or you have an
>>>> unusual use case. In most cases you would simply write the entire
>> graph to
>>>> disk (Ususally using TDB as the storage engine as it will handle all the
>>>> persistence for you). If you really want to write each user to a
>> separate
>>>> file then I would suggest creating a model using the Construct select to
>>>> pull all the data about the user and then write that graph to disk using
>>>> the standard graph.write() functionality.
>>>>
>>>> Claude
>>>>
>>>> On Fri, Dec 2, 2016 at 8:18 AM, Lorenz B. <
>>>> [email protected]> wrote:
>>>>
>>>>>> Hi
>>>>>> I want to create student instances of my Student class and enter his
>>>>>> details. Then at the end I writes model to the file.
>>>>>>
>>>>>> OntClass std = model.getOntClass(ns + "Student");
>>>>>> Individual mystd = std.createIndividual(ns + stdname);
>>>>>>
>>>>>> In the file when I enter name of a student, i-e Bob, it saves to the
>>>> file
>>>>>> along other information like department, address etc.
>>>>>> Next time, when I enter another student name, i-e Alice, it replaces
>>>>>> previous instances of students and currently only one student is saved
>>>> to
>>>>>> file.
>>>>>>
>>>>>> I want record of all students so need all student instances. I used
>> for
>>>>>> file writing.
>>>>> I don't understand the problem. You have to load the existing model and
>>>>> add new individuals to it. If you don't open the existing model, indeed
>>>>> only what's added to your new model will be saved to the file.
>>>>>> try (FileOutputStream write = new FileOutputStream("D://
>>>> students.owl"))
>>>>> {
>>>>>> model.write(write, "RDF/XML");
>>>>>>
>>>>> --
>>>>> Lorenz Bühmann
>>>>> AKSW group, University of Leipzig
>>>>> Group: http://aksw.org - semantic web research center
>>>>>
>>>>>
>>>> --
>>>> I like: Like Like - The likeliest place on the web
>>>> <http://like-like.xenei.com>
>>>> LinkedIn: http://www.linkedin.com/in/claudewarren
>>>>
>> --
>> 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
