Connector/C 6.1 provides these features not present in 6.0:
Support for the pluggable authentication framework that enables implementation of authentication methods as plugins. This framework can be used for MySQL native authentication as well as external authentication methods. See Pluggable Authentication.
The older Connector/C 6.0 can connect only to accounts that use native MySQL passwords. If a client program attempts to connect to an account that requires a different authentication method, an “Access denied for user” error occurs.
Support for connecting to accounts that have expired passwords. See Password Expiration and Sandbox Mode.
Support for prepared
CALLstatements. This enables client programs to handle stored procedures that produce multiple result sets and to obtain the final value of
INOUTprocedure parameters. See C API Prepared CALL Statement Support.
Support for connecting over IPv6. See IPv6 Support.
Support for binding client programs to a specific IP address at connect time. See mysql_options().