help with recovering world from sqlite backend

[isb0459]

I want to start up a python process, import owlready2, and recover the default_world that was explicitly  saved when I closed my previous python session. I am assuming in the recovered world object I can access my ontology object. I'd like explicit instructions please. Thank you very much.

[Jiba]

Hi,

You need to define the SQLite file at the beginning of your program, as follows:

default_world.set_backend(filename = "your_file.sqlite3")

Then, you can save the current state with:

default_world.save()


To recover the state previously saved, just call again the default_world.set_backend(...) lines.
Then, you can get your ontologies as usual :

onto  = get_ontology("http://server.org/ontology_name.owl").load()

If already present in the quadstore, the ontology will be loaded from the quadstore, not from the IRI.

Jiba

[isb0459]

Hi. Should the recovery work as well with the URI of an RDF file? Thank you.

Regards,

  Ian

On Fri, Oct 30, 2020 at 12:14 PM Jiba [via Owlready] <[hidden email]> wrote:

Hi,

You need to define the SQLite file at the beginning of your program, as follows:

default_world.set_backend(filename = "your_file.sqlite3")

Then, you can save the current state with:

default_world.save()


To recover the state previously saved, just call again the default_world.set_backend(...) lines.
Then, you can get your ontologies as usual :

onto  = get_ontology("http://server.org/ontology_name.owl").load()

If already present in the quadstore, the ontology will be loaded from the quadstore, not from the IRI.

Jiba

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NAML

[Jiba]

Hi,

The quadstore file used in set_backend() must be a SQLite3 file, either a new file or a file created previously with Owlready. You cannot use directly an IRI or an OWL or RDF file; you need to import the file previously in Owlready to create a valid quadstore.

Jiba

[isb0459]

You just said up above in your reply:

onto  = get_ontology("http://server.org/ontology_name.owl").load()
If already present in the quadstore, the ontology will be loaded from the quadstore, not from the IRI.

So, I'm just asking if it works the same with a URI ending ".rdf" instead of ".owl" ?

-- Ian

On Mon, Nov 2, 2020 at 4:34 AM Jiba [via Owlready] <[hidden email]> wrote:

Hi,

The quadstore file used in set_backend() must be a SQLite3 file, either a new file or a file created previously with Owlready. You cannot use directly an IRI or an OWL or RDF file; you need to import the file previously in Owlready to create a valid quadstore.

Jiba

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NAML

[Jiba]

Yes, it will work with .rdf files, as long as they are in OWL/RDF format (e.g. not turtle).

Jiba

[isb0459]

Thanks very much.
  -- Ian