the connection object which describes the server and the database name to which the connection shuld be opened
The DSN of the database. Can be NULL.
The username for authentication to the database. Can be NULL.
The password for authentication to the database. Can be NULL.
The function activates the correct CORBA server (defined with he #gda_connection_set_provider() function. Then it tries to open the database using the DSN or the default database as a data source. If user or pwd is not NULL, it will overwrite the appropriate entry in the DSN passed as par2. Entries in the DSN have the form = seperated from the database name . Currently the DSN is not parsed.