DISCONNECT —
Function
Closes the connection to DATABASE and resets *DEFAULT-DATABASE* if that database was disconnected. If DATABASE is a database instance, this object is closed. If DATABASE is a string, then a connected database whose name matches DATABASE is sought in the list of connected databases. If no matching database is found and ERROR and DATABASE are both non-nil an error is signaled, otherwise nil is returned. If the database is from a pool it will be released to this pool.