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.
On Fri, Dec 2, 2016 at 2:00 PM, Lorenz B. <
buehm...@informatik.uni-leipzig.de> 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 <cla...@xenei.com> 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. <
> >> buehm...@informatik.uni-leipzig.de> 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
>
>
