Force the Jena adapter to generate SQL and not SEM_MATCH calls

Hello

I have the following query in which I bind ? o and? s values (using the ORACLE_SEM_UEAP_NS namespace)

SELECT * WHERE 
{
    ?s    vcard:postal-code    ?o
}

I have two environments on which I run this query with adapter Jena; with JDeveloper and Oracle database JVM remotely.

When run remotely, I can see that SQL is always generated for this query; regardless of the connection that I use.

When running on the Oracle JAVA virtual machine, the first execution in the current session gets generated SQL. All subsequent queries with a modified Binder (for example: initial request, only ? o is linked, the second query, ? s is linked), Jena Adapater generates calls SEM_MATCH. If I run again the initial query, SQL is generated.

Is there a way to force the Jena adapter stick to SQL rather than SEM_MATCH, in this case?

Thank you.

Hello

Thanks for your reply. I reassembled the problem to this line.

OracleConnection conn = (OracleConnection) ods.getConnection();
...
conn.close();

It seems that if I close the connection when running on Oracle, Jena adapter generates a SEM_MATCH call for the following requests, which have a different syntax than the first. I'm curious to know what it does.

Kind regards.

Tags: Database

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