Communicating with PostgreSQL Using LibPQ - PostgreSQL Developer's Guide - page 169

• sslmode
• disable
• allow
• verify-ca
• verify-full
• requiressl
• sslcert
• sslkey
• sslrootcert
• sslcrl
• requirepeer
• krbsrvname
• gsslib
• service
The details of these values can be found at http://www.postgresql.org/
docs/9.4/static/libpq-connect.html#LIBPQ-PARAMKEYWORDS .
If you see the following kind of error, then it is due to an error in the
conninfo string:
missing "=" after "port" in connection info string
Using PQconnectdbParams
The PQconnectdbParams function is a variant of the PQconnectdb function. Like
PQconnectdb , this function takes a two-dimension array of keys and values instead
of a single key-value pair string. This function only differs in the function argument
to PQconnectdb . The syntax for PQconnectdbParams is as follows:
PGconn *PQconnectdbParams(const char **keywords,
const char **values,
int expand_dbname);