Comments on: The Semantic Web with .NET. Pellet, Jena and SQL Server 2005

By: admin

admin — Thu, 18 Jun 2009 06:07:24 +0000

Jonh, once you convert the jar’s to dll’s you can use java packets as C# namespaces and use Pellet and Jena API as usual. How to use these API’s is explained in their home pages

By: Jonh

Jonh — Wed, 17 Jun 2009 22:29:36 +0000

How do you do queries with pellet in C#? You don’t show in here

By: admin

admin — Mon, 01 Jun 2009 19:27:40 +0000

By using the following:

ikvmc .\Java_Libraries\*.jar -target:library -out:.\DotNet_Libraries\semantic_reasoners.dll -version:1.5.2.0 -nowarn:IKVMC0109

All the jars are in Java_Libraries directory.

Best regards.

By: Samuel

Samuel — Mon, 01 Jun 2009 13:16:28 +0000

Hi, problem solved!! The problem was in Sql Server; I had to enable the access to tcp/ip, and the way i connected to the db, etc.

But i noticed that i’m not putting the jar’s in just 1 dll, is just add the last jar…

how did you add the jar’s just in one??

By: Samuel

Samuel — Fri, 29 May 2009 11:31:07 +0000

Hi!

now is giving me this error

“com.hp.hpl.jena.db.RDFRDBException was unhandled
Message=”Failure to instantiate DB Driver:MsSQL com.microsoft.sqlserver.jdbc.SQLServerException: The server sqlexpress is not configured to listen with TCP/IP.”
Source=”JenaCSharpTest3″
StackTrace:
em wsGeoConceptsSemWebLayer.JenaPersistenceRDB..ctor(String modelName, String dbserver, String db, String dbuser, String dbpass)…”

i have a Windows Forms Application with a button that is calling

” JenaPersistenceRDB jprdb = new JenaPersistenceRDB(”dotnetmodel”, “ACER-JO\\SQLEXPRESS”, “localhost”, “ACER-JO\\Joana”, “”); ”

am i missing something? do i need anything more then the 3 dll’s (the one that i created with ikvmc and the 2 ikvm) dont need anymore of jena or pellet?

By: admin

admin — Tue, 26 May 2009 19:54:12 +0000

You have several options for making IKVM conversion, build a dll for each jar (As I proposed in the post) or build only one dll containing all jar conversions.

I also had several times the problem of “No suitable driver found” but I resolved it by converting all jena, pellet, sql driver etc. in the same dll with IKVM.

I hope this solve your doubts.

By: Samuel

Samuel — Tue, 26 May 2009 17:34:51 +0000

Hi! I follow your tutorial and it happens the same that Alex Golubev.

Failure to instantiate DB Driver:MsSQL java.sql.SQLException: No suitable driver found for jdbc:sqlserver://…

What do you mean by “Try to convert all the jar’s into the same dll, including pellet, jena and the sql driver.” You are talking about convertion with IKVM? I also read your other post and i used the new tool versions.

Any ideia of what i might doing wrong?

Can u help?

By: Alex Golubev

Alex Golubev — Tue, 25 Nov 2008 20:53:04 +0000

Thank you.Nice to meet you on next level!Eventually tables appeared in my base.
But I got except.:”Graph properties not found after creating graph.”
I can’t owercome, help!