The libecpg library primarily contains "hidden" functions that are used to implement the functionality expressed by the embedded SQL commands. But there are some functions that can usefully be called directly. Note that this makes your code unportable.
ECPGdebug(int on, FILE *stream) turns on debug logging
if called with the first argument non-zero. Debug logging is
done on stream. Most
SQL statement log their
arguments and results.
The most important function, ECPGdo, logs all SQL statements with both the expanded
string, i.e. the string with all the input variables
inserted, and the result from the PostgreSQL server. This can be very
useful when searching for errors in your SQL statements.
ECPGstatus() This method
returns true if we are connected to a database and false if
not.