libpq vs pqxx

Hello all,

I am writting a simple C++ program to access my postgresql 8.0 database.
What is the difference from using the interface of libpq versus the pqxx
librairy (use of PGconn, PGresult provided in the /usr/include/libpq-fe.h
file versus connection, result etc provided in the /usr/include/pqxx
directory)?

Thanks for your help!
Jana

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