Visual C++, CMap object save to blob column

Question

I have a MFC CMap object, each object stores 160K~ entries of long data. I need to store it on Oracle SQL. we decided to save it as a blob. since we do not want to make additional table. we also thought about saving it as local file and point the SQL column to that file, but we rather just keep it as blob on the server and clear the table every couple of weeks.
The table has a sequential key as ID, and 2 column of time. I need to add the blob column in order to store on every row that CMap.
Can you recommend a guide to do so (read/write Map to blob or maybe a clob) ? Thanks.

Answer 1

The LOB exists in server memory. Your code cannot access that memory for a memcpy or similar calls. Your code deals with a LOB locator variable (another name for a pointer) - and casting this makes no sense. Casting it does not deference it.
The DBMS_LOB PL/SQL interface exposes the basic interface for LOBs. This, and client drivers, use the OCI (Oracle Call Interface) under the hood.
The OCI provides a ranges of features - including binding host variables (variables in your code) to bind variables (variables in PL/SQL and SQL calls to the database). See Oracle® Call Interface Programmer's Guide for binding LOBs.
The functionality of the OCI needs to be exposed by whatever db abstract interface you use. If it does not do that properly, then you can use PL/SQL as the interface. Or call the OCI directly.