libpq is the C application programmer's interface to PostgreSQL. As I understand, this establishes multiple low-level connections to PostgreSQL's backend.
I was wondering, as a PostgreSQL backend developer, for example, a PostgreSQL extension developer (with PGXS), is there a similar interface or method available to execute an SQL query? In other words, I am no longer programming from my application, but I am programming from the PostgreSQL backend itself. I am guessing that this method would incur less overhead than libpq?
