Strange result from query::execute()?

[Kevin Regan]

Should the following have different results?

        ...
        std::string s = "SET AUTOCOMMIT=1";
        query.execute(s.c_str());
        query.execute(s);

The first succeeds.  The seconds throws an exception with the value "Query was empty." 
Looking at the code, the first call goes to Query::execute(const char*).  However, the
second uses a "parms" version of execute.

Is this expected behavior?  From the library user's perspective, it seems confusing.

--Kevin