simplefetch
error = simplefetch(xc, INT8OID, &dummy);
int simplefetch(struct Xconn *, Oid, ...);
error = simplefetch(xc, INT4OID, &ret);
error = simplefetch(xc, INT4OID, &ret);
error = simplefetch(xc, BYTEA, buf, &resultsize);
error = simplefetch(xc, INT4OID, &resultsize);
return simplefetch(xc, INT4OID, fdp);
error = simplefetch(xc, INT4OID, &ret);
return simplefetch(xc, INT8OID, idp);
error = simplefetch(xc, OIDOID, &loid);
error = simplefetch(xc, TEXTOID, &type);
error = simplefetch(xc, INT4OID, &ret);
error = simplefetch(xc, INT4OID, &dummy);