Semantic Technologies :: NullPointerException While Executing SPARQL Through Jena
Jul 19, 2012
I was trying to execute a SPARQL through Jena API. I am getting the following exception when invoking the
"ResultSetFormatter.out(System.out, results);" method.
I connect to Oracle using the following Jena code
============================================
Oracle oracle = new Oracle(szJdbcURL, szUser, szPasswd);
Model model = ModelOracleSem.createOracleSemModel(
oracle, szModelName);
==============================================
This is the exception I am getting.
java.lang.NullPointerException
at oracle.spatial.rdf.client.jena.OracleRepeatApply.nextStage(OracleRepeatApply.java:794)
at com.hp.hpl.jena.sparql.engine.iterator.QueryIterRepeatApply.makeNextStage(QueryIterRepeatApply.java:101)
at com.hp.hpl.jena.sparql.engine.iterator.QueryIterRepeatApply.hasNextBinding(QueryIterRepeatApply.java:53)
[code].....
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Jul 23, 2013
We want to convert our application from Jena TDB to Oracle. In our ontology there are 40.000 triples. Oracle takes 6.8 sec. while Jena TDB takes 0.59 sec. Oracle is much slower than jena TDB. You can see both codes below. There are no inferencing for both apps. How can I improve the performance of Oracle?
Both applications and their data sources are running on same machine.
Oracle code:Oracle oracle = new Oracle(szJdbcURL, szUser, szPasswd); Attachment attachment1 = Attachment.createInstance( new String[] { szSchemaName, szImpactName }, new String[] { }, InferenceMaintenanceMode.NO_UPDATE, QueryOptions.DEFAULT); graph1 = new Graph Oracle Sem(oracle, szModelName, attachment1);m = new ModelOracleSem(graph1); listSubclass = m.listStatements(null,)
[code]....
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Apr 17, 2013
I'm new in the group and no have much experience in Spatial area.
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Oct 13, 2013
I am using Oracle 12c Spatial and Graph and I would like to retrieve the nearest neighbors of a point from a dataset encoded according to GeoSPARQL.I have created a spatial index on the datatype geo:wktLiteral and I to the query so the optimizer pick a plan using the index RDF_V$GEO_IDX. The query I pose is the following:
SELECT geo, wkt
FROM TABLE(SEM_MATCH('
PREFIX geo: <http://www.opengis.net/ont/geosparql#>
SELECT ?geo ?wkt
[code]...
I do not get any error but I do not get any results neither. However, there are a lot of points around POINT(22.39 38.25) in my dataset and if I remove the filter I get results.Do I use orageo:nearestNeighbor in a wrong way?
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Apr 28, 2013
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Mar 7, 2013
I'm currently doing migration from Oracle 10gR2 RDF to Oracle 11gR2 Semantic Technology.I followed the steps on the documentation and successfully created the network using the following:
-----
EXECUTE SEM_APIS.CREATE_SEM_NETWORK('rdf_tblspace');
CREATE TABLE rdf_network_trace (id NUMBER, triple SDO_RDF_TRIPLE_S);
--Created SEQUENCE andTRIGGER FOR rdf_network_trace id
[code]....
when I looked at my Node Ids, they were like +635762253807433724+, +6118969225776891730+. The problem is, I am not the one who is assigning Node Ids, They were automatically generated when inserting TRIPLE data to the rdf table.
Did I miss something when I created my network?
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Dec 22, 2012
I got an exception when I was using sesame adapter to dump a turtle file which contains long texts as objects into oracle semantic database. The exception information is:
org.openrdf.repository.RepositoryException: org.openrdf.sail.SailException: java.sql.SQLException: ORA-01461: can bind a LONG value only for insert into a LONG column
ORA-06512: in "SF.ORACLE_ORARDF_ADDHELPER", line 1
ORA-06512: in line 1
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:439)
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:395)
at oracle.jdbc.driver.T4C8Oall.processError(T4C8Oall.java:802) ...
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Apr 26, 2013
I am developing android application connected to Oracle database using PHP, and I use PL/SQL statements with semantic technologies provided in Oracle(specifically, SEM_MATCH, SEM_MODELS, SEM_RULEBASES or something like this).
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*<?php*
function db_connect()
*{*
*$db = "(DESCRIPTION=(ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = 203.249.105.20)(PORT = 1521)))(CONNECT_DATA=(SID=orcl)))";*
[code]...
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Sep 3, 2010
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Aug 30, 2007
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Its not possible but i could call each procedure from ONE procedure
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Mar 5, 2009
I don't know how to control if a call to a PL function return errors.
I have this ksh:
executeFunction () {
echo "[executeFunction ]-> Phoebus DB started"
sqlplus -s /nolog <<!EOF!
CONNECT $USER/$PWD@$DB
@/sql/ejecutaFuncion.sql
EXIT;
!EOF!
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executeFunction
And the code of "ejecutaFuncion.sql" is:
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EXIT
How i can controle if the "startProcessing" function has any problems from the ksh?
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Oct 4, 2010
I am getting errors while executing the following block.
create TYPE c_Rec as object(a VARCHAR2(1), b NUMBER);
DECLARE
-- TYPE c_Rec as object(a VARCHAR2(1), b NUMBER);
TYPE c_collection IS TABLE OF c_Rec;
l_coll c_collection := c_collection();
BEGIN
[code]........
error
06530. 00000 - "Reference to uninitialized composite"
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Mar 24, 2008
I have created one function in the package.
function : Tier_wh
package : Order_DESC
Function defined as
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...
...
end;
Xorder_desc is defined as
create or replace type Xorder_desc type
(order number(10),
location number(10),
wh varchar2(20)
);
how to execute this function which is defined in the package .
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Nov 3, 2010
i have tablestructure like this
empno ename sal
1 sam 1000
2 tom 2000
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empno ename sal prevemp prevename presale
1 sam 1000 0 0 0
2 tom 2000 1 sam 1000
3 ric 3000 2 tom 2000
4 mac 4000 3 ric 3000
5 doy 5000 4 mac 4000
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Jul 30, 2012
I've defined DBMS_JOB in Oracle it is not starting on time. As per query it should start at 09:00 PM as given below.
SQL> SELECT TRUNC(SYSDATE) + 21/24 FROM DUAL;
TRUNC(SYSDATE)+21/24
--------------------
7/31/2012 9:00:00 PM
But instead it was started on 7/31/2012 1:14:10 AM. Which is wrong.
Following is script which I am using to submit this job.
DECLARE
X NUMBER;
BEGIN
[Code]....
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Jul 18, 2011
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union
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[code]...
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declare
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END_DT VARCHAR2(30);
begin
SELECT '01-APR-2011'
INTO END_DT
FROM DUAL;
[code]....
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Sep 9, 2012
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Aug 11, 2011
Database 1(sm01):
=============
oracle, 9.2.0.6
there are 4 jobs scheduled in oracle dbms_job. 3 jobs will run everyday at 4.00AM. 1 job will run at every hour.Daily jobs are running fine. But hourly job is not executing automatically. If forced (exec dbms_job.run(<enter here job number>), this execute fine.
job_queue_processes=5
total jobs in schema=2503
total jobs in db = 2614
Even there are many jobs scheduled, next_date for 2234 jobs are lesser than the sysdate. Again in 269(2503-2234) jobs, 2265 are having NULL in the interval column.
Database 2(sm02):
=============
oracle, 9.2.0.6
there are 4 jobs scheduled in oracle dbms_job. 3 jobs will run everyday at 4.00AM. 1 job will run at every hour.All the jobs are not running automatically. If forced (exec dbms_job.run(<enter here job number>), these execute fine.
job_queue_processes=5
total jobs in schema=7
total jobs in db = 7
I planning to follow the below steps to avoid the above issue.
1.) Restart the job queue process by executing alter system set job_queue_processes=0
2.) Increase the value for the job_queue_processes.
3.) Restart the database
But I got stuck in the 2nd step. what value I need to put for this job_queue_processes parameter?
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Aug 4, 2010
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Aug 24, 2010
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Mar 2, 2013
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Jul 31, 2013
How to execute Sql Server procedure from Oracle.I have created a dblink and when calling directly to that procedure it is throwing error.
--creationg sqlserver procedure
create proc getRecords
as
print 'testing';
--creating db link
create database link remote connect by ss identified by ss using 'remote';
[code]....
I have found DBMS_HS_PASSTHROUGH package is capable of doing it but not sure how to do.
Nathan
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Oct 5, 2010
I am trying to insert data from 9i to 11g using db link with the below query but while doing so the select statement is going for a full table scan even though rowid is used. But when we execute the same select statement without this insert command it is using proper index. Similar issues I am facing for updates.
Query:
INSERT INTO /*+ APPEND */ emp@db_link
select *
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Sep 16, 2010
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Oct 2, 2013
I'm trying to find a simple way of getting around this. I have a PL/SQL procedure which loops through a list of values in a table. These values are the actual names of the functions I want it to run in sequence. The problem is I can get the string value each time but I need to store the return value of each function into a number variable e.g.
BEGIN
open all_tests;
fetch all_tests BULK COLLECT INTO test_tabl;
close all_tests;
for myindex IN 1..test_tabl.count LOOP
time_taken := test_source1 ==> this will work but how do I avoid hardcoding the name of the function to be executed and use the test_name value instead?? time_taken is declared as a number (ie the return value of each function is a number)
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Feb 16, 2010
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set serveroutput on
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[Code].....
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Aug 9, 2011
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DECLARE
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P_DATA1 xxx_package.xxxtype;
P_DATA2 xxx_package.xxxtype;
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[code]........
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Jan 26, 2011
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