Cannot Create RDF View in R2RML Conversion Example

Question

Hi All,
In a project I want to do a R2RML conversion. I folowed below steps according to 12c Release 1 tutorial.
1. Create a stage table with below command.
CREATE TABLE stage_table_name(
                     RDF$STC_sub varchar2(4000) not null,
                     RDF$STC_pred varchar2(4000) not null,
                     RDF$STC_obj varchar2(4000) not null,
                     RDF$STC_graph varchar2(4000)
2. Grant select and insert this stage table for user MDSYS
GRANT SELECT, INSERT ON STAGETAB TO MDSYS;
3. Load r2rml mapping to this stage table with running below java code.
Oracle oracle = new Oracle (connectionUrl, user, password);      
GraphOracleSem graph = new GraphOracleSem(oracle, modelName);
FileInputStream is = new FileInputStream(mappingFile);
graph.getBulkUpdateHandler().prepareBulk(is,//inputstream
      "http://example.com", // base URI
      "TTL", // data file type: can be RDF/XML, N-TRIPLE, etc.
      "rdf_users", // tablespace
      null, // flags
      null, // listener
      stageTableName// staging table name.
graph.close();
oracle.dispose();
4. Create RDF View with this stage table to execute below command.
BEGIN
sem_apis.create_rdfview_model(
model_name => 'rdf_view_name',
tables => NULL,
r2rml_table_owner => 'user',
r2rml_table_name => 'stage_table_name'
END;
I performed first 3 steps successfully. Stage table has been created and r2rml mapping has been loaded to this stage table. But in the last step there is an error like this;
[Error] Execution (1: 3): ORA-00904: "CHILDCOL$RDFTERM": invalid identifier
ORA-06512: at "MDSYS.SDO_RDF_INTERNAL",  line 14308
ORA-06512: at "MDSYS.SDO_RDF",  line 3616
ORA-06512: at "MDSYS.RDF_APIS",  line 1253
ORA-06512: at  line 2
How can I solve this problem?
Thanks

Answer 1

Hi Pinar,
I created the same staging table, loaded up exactly the same mapping file, run the create_rdfview_model, and
could not reproduce the problem.
Note that I created the "staging_table_name"  under schema SCOTT. And these are the commands I used.
public class Test2616990
  public static void main(String[] args) throws Exception
    String szJdbcURL = args[0];
    String szUser    = args[1];
    String szPasswd  = args[2];
    String szModelName = args[3];
    Oracle oracle = new Oracle(szJdbcURL, szUser, szPasswd);
    ModelOracleSem model = ModelOracleSem.createOracleSemModel(oracle, szModelName);
    GraphOracleSem graph = model.getGraph();
    FileInputStream is = new FileInputStream("map.rdf");
    graph.getBulkUpdateHandler().prepareBulk(is,//inputstream 
      "http://example.com", // base URI 
      "N3", // data file type: can be RDF/XML, N-TRIPLE, etc. 
      "SYSAUX", // tablespace 
      null, // flags 
      null, // listener 
      "stage_table_name" // staging table name. 
    model.close();   
    oracle.dispose();
alwu:lib/% cat run.sh
java -classpath ./classes:jena-arq-2.9.2.jar:jena-core-2.7.2.jar:jena-iri-0.9.2.jar:log4j-1.2.16.jar:ojdbc6.jar:sdordfclient.jar:sdordf.jar:slf4j-api-1.6.4.jar:slf4j-simple-1.6.4.jar:xercesImpl-2.10.0.jar:xml-apis-1.4.01.jar Test2616990 jdbc:oracle:thin:@<host>:1521:rel12101  scott  <password>  zhe1
BEGIN 
    sem_apis.create_rdfview_model( 
    model_name => 'rdf_view_name', 
    tables => NULL, 
    r2rml_table_owner => 'SCOTT', 
    r2rml_table_name => 'STAGE_TABLE_NAME' 
    END; 
SQL>   2    3    4    5    6    7    8    9 
PL/SQL procedure successfully completed.
Hope it helps,
Zhe Wu