[fdo-internals] King Oracle Issue

Thomas Knoell thomas.knoell at supernaanalytics.com
Wed Jun 10 14:41:36 EDT 2009



I am working on a FDO based application that should use the King Oracle
Provider to connect to a data source on an Oracle 11g instance. The
application currently connects fine to an empty data store (the data store
does not contain any tables) and successfully applies a test schema that
consists of a feature and a non feature class. The problem arises in the
following step where a describe schema request is executed. In this case,
the result is one schema named KingOra and no classes. I expected the test
schema and its corresponding classes being reported.


The application has access to all the DLLs that come with FDO. The DLLs were
created by compiling the projects from the trunk in release mode. Due to the
fact that I use MS Visual Studio C++ 2008 Express Edition, I had to open
each solution and compile it separately as some of the projects referenced
MFC files that are not available with the Express Edition. Those issues were
corrected in the shadow and all builds succeeded. 


Besides the changes to eliminate MFC references, one additional change was
required in the King Oracle provider project in that the references to
Oracle 10 libs were replaced by the corresponding Oracle 11 ones. 


Using the command built.bat -c=release -a=install -o=c:\FdoHome on the FDO
and ThirdParty directory, all DLLs were copied into the specified folder and
hence made accessible to the FDO application.


The providers.xml file was modified to include the following statement for
the King Oracle Provider:




    <DisplayName>King Provider for Oracle</DisplayName> 

    <Description>Read/write access to spatial and attribute data in an
Oracle Spatial.</Description> 







I did perform some debugging on the code. When following the statement that
retrieves the schema name (see code below), I noted that it does not hit the
function that implements the retrieval of the schema name but ends up in the
function FdoCollection::GetCount() (file
FDO\Unmanaged\Inc\Common\Collection.h). However, following other requests
like the apply schema execute or the describe schema execute call, the
correct functions are hit and executed. I also did some dependency checks on
some DLLs and executables and nothing missing was reported.


I assume that this may be just a simple setup issue but after trying
multiple things now, I reached a point where I am not sure what to try next.
If someone has any suggestions I would appreciate the feedback. Also, if
there are additional questions, please let me know.








      FdoPtr<FdoIDescribeSchema> describe_schema_cmd = 

        (FdoIDescribeSchema*) fdo_connection->CreateCommand(


      FdoFeatureSchemasP schema_collection = describe_schema_cmd->Execute();

      FdoInt32 schema_count = schema_collection->GetCount();

      if (schema_count == 0)

          printf("   -> No schemas found \n");


        for (int s = 0; s < schema_count; s++) {


          FdoFeatureSchemaP curr_schema = schema_collection->GetItem(s);

          FdoStringP curr_schema_name = curr_schema->GetName();

          printf("   -> Schema[%d]: %ls \n", s, (FdoString

          FdoPtr<FdoClassCollection> curr_schema_classes =


          FdoInt32 curr_schema_class_count =

          if (curr_schema_class_count == 0)

              printf("     -> No classes found for current schema \n");


            for (int sc = 0; sc < curr_schema_class_count; sc++) {


              FdoPtr<FdoClassDefinition> curr_schema_class =


              FdoStringP curr_schema_class_name =

              printf("     -> Class[%d]: %ls \n",


                     (FdoString *)curr_schema_class_name);


            }  //  for (int sc = 0; ...


        }  //  for (int s = 0; ...



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