[Mysqlcppapi-main] [patch] Simplify Connection.cc

[Jonathan W. <co...@co...>]

I propose committing this patch to mysqlcppapi/Connection.cc

It introduces two inline utility functions that simplify the rest of the
file by making std::string to const char* conversions where an empty
string becomes a null pointer and vice versa.

Also adds the mysql_error() msg to the exception thrown when connection
fails.

I'll commit soon, after waiting for any comments.

jon


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