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TDB for begginers   Message List  
Reply | Forward Message #37250 of 42511 |
Re: [jena-dev] Model to RDB?

On Monday 08 December 2008 14:04:22 Chris Dollin wrote:

> As a statup tactic, write the data out in Turtle (which you can do
> using the command-line jena.rdfcat tool, you don't have to write any
> Java code) and query it using SPARQL.

That was probably confusing. What I meant was:

(a) Write the data out in Turtle (etc), so that you can look at it
and get the idea of what it's about.

(b) When you want to query the data, you can query it using SPARQL.
The query syntax of SPARQL is similar to the notation of Turtle
(not by accident), so that it's easier to see how a query matches
up with the data.

Also, if what you're looking at is an ontology rather than instance
data, you should read Jena's ontology documentation, since some of
the queries you'd want to make on an ontology are part of the ontology
API.

--
"We did not have time to find out everything /A Clash of Cymbals/
we wanted to know." - James Blish

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registered no: 690597 England Berks RG12 1HN



Mon Dec 8, 2008 2:34 pm

kers_ihy
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Message #37250 of 42511 |
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Hi, I am working on a pilot project - building large ontology (millions of individuals). I did some reading on TDB (from the little I could find) and it seems ...
y_mazar
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Dec 8, 2008
8:45 am

... TDB is still evolving but it is useable - other people are using it for their systems. ... No - TDB does not use SQL. It runs it's own custom database. If...
Seaborne, Andy
andyseaborne
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Dec 8, 2008
9:58 am

First of all, Thanks for the prompt reply. One of the things that I could not understand (And I guess that my question regaeding MS-SQL shows it) is the basic...
y_mazar
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Dec 8, 2008
12:44 pm

Hi, Is there a way for me to take an ontology using JENA and write it into a relational DB? I would like to be able to try to browse the data with a DB tool...
Alex Genadinik
genadinik
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Dec 8, 2008
1:04 pm

... Yes. But it may not be what you want. You can put a Jena model into an RDB using either the Jena built-in ModelRDB or the newer additional library, SDB. In...
Chris Dollin
kers_ihy
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Dec 8, 2008
2:03 pm

... That was probably confusing. What I meant was: (a) Write the data out in Turtle (etc), so that you can look at it and get the idea of what it's about. (b)...
Chris Dollin
kers_ihy
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Dec 8, 2008
2:33 pm

... If you want to map from an ontology to a more traditional relational database structure then there are tools, but you'll have to understand the ontology...
James Howison
jameshowison
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Dec 8, 2008
4:42 pm

... TDB stores its persistent data on disk. It's a library and is used via the Jena API. Joseki provides the SPARQL Protocol (i.e the use of HTTP to make...
Seaborne, Andy
andyseaborne
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Dec 8, 2008
1:29 pm
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