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,
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
ECPGstatus() This method returns true if we
are connected to a database and false if not.