- PQexec(cnxn, "..."):
- PQexec is the function for submitting commands (with no
parameters) to Postgres.
- The command is carried over the connection —
cnxn — which
also carries back results.
- PQresultStatus(res) != PGRES_COMMAND_OK:
Check for correct execution.
- PQclear(res): Cleanup the result from the database.
(Memory management — if you don't do this, valgrind will report a leak.)