Cannot query varray of object types-please help

Question

I am attempting to query the "diminfo" field of the view "MDSYS.all_sdo_geom_metadata". The field is "described" as MDSYS.SDO_DIM_ARRAY, which I believe is a varray of MDSYS.SDO_DIM_ELEMENT.
I have run OTT to generate the class files, but nothing is generated for the MDSYS.SDO_DIM_ARRAY "type" (maybe because it's not really a type?). A class is generated for the SDO_DIM_ELEMENT objects.
Anyway, I have tried to query the field using both "VALUE(diminfo)" and "REF(diminfo)":
select VALUE(diminfo) from all_sdo_geom_metadata;
- or -
select REF(diminfo) from all_sdo_geom_metadata;
and I get back an ORA-904 "invalid identifier". When I remove the "VALUE" or "REF" from the query, the error goes away, and is replaced by an ORA-32162 "Read/Write method not registered" further down in the code when I try to retreive the value from the recordset:
myDimInfo = rSet->getObject(1);
Since the field type (MDSYS.SDO_DIM_ARRAY) isn't really an object type, I can see why the "Read/Write method not registered" occurs-there are no methods to register.
Can someone provide a code snippet of how to perform this query?
Thanks in advance

Answer 1

Hi,
I am using OTT generated objects to pass them to my PL/SQL procedures as OUT parameters. When I call the registerOutParam() function, I get this error ORA-32162: Read/Write SQL method not registered.
I am calling my mapping function after creating environment and before creating my stateless connection pool. But still I am getting this exception at runtime while calling registerOutParam().
Environment* env;
env = Environment::createEnvironment(Environment::OBJECT);
MessageTOMapping(env); // Calling the mapping function here.
// Creating the stateless connection pool.
StatelessConnectionPool* scp;
scp = env->createStatelessConnectionPool("naveen",
"naveen",
"//10.105.153.11:1521/pls",
10,
5,
2,
StatelessConnectionPool::HOMOGENEOUS);
// Fetch a connection from the stateless connection pool
conn = scp->getConnection();
// After this, I create my Statement and call the registerOutParam() which
// causes ORA-32162 exception.
Please note that I do not get this error when I don't use any connection-pooling mechanism. That is, if I create an environment in OBJECT mode, call the mapping function with its pointer and create a normal Connection object (without any pooling etc), my application runs perfectly fine. E.g. if I replace the above piece of code with the code below, my application runs fine.
Environment* env;
env = Environment::createEnvironment(Environment::OBJECT);
MessageTOMapping(env); // Calling the mapping function here.
conn = env->createConnection("naveen", "naveen", "//10.105.153.11:1521/pls");
// After this, I create my Statement and call the registerOutParam() which
// does not give problem now and my application runs pefectly fine.
Can anyone let me know what I am doing wrong while using the stateless connection pooling mechanism? I definitely need to use Stateless Connection Pooling and must not get connections directly from env->createConnection().
Any help will be greatly appreciated.
Thanks and Regards,
Naveen