Type conversion. What do I do with a PostgreSQL OID value in libpq in C?

Question

I\'m working with the PostgreSQL C API, libpq. I need to be able to convert the values in a PGresult* into their equivalent data types in Ruby. I\'m currently j

Answer 1

I found the answer after asking this. Basically there's a file called catalog/pg_type.h, alongside libpq-fe.h and postgres.h. You need to include after including libpq-fe.h and postgres.h, then you can access the definitions like TEXTOID, BOOLOID, INT4OID etc.

#include 
#include 
#include 
#include 

// ... snip ...

if (PQgetisnull(result, row, col)) {
  // value is NULL, nothing more to do
} else {
  char * value  = PQgetvalue(result, row, col);
  int    length = PQgetlength(result, row, col);

  switch (PQftype(result, col)) {
    case INT2OID:
    case INT4OID:
    case INT8OID:
      // process value as an integer
      break;

    default:
      // just default to a text representation
  }
}

You need to look at all the OIDs in pg_type.h to actually have an extensive list, or just test what you get back doing basic SELECT 't'::boolean type queries etc and build up the switch only as you need a new type supporting.