> 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
