I think you are using a 32-bit toolset (VS Express) and trying to link with the 64-bit version of libmysql.lib.
The 32-bit version of libmysql.lib comes with those missing symbols, what you have is the 64-bit library.
Thanks for all your help. I had to uninstall the 64-bit version of MySQL and install the 32-bit version because VC++ 2008 Express is not a 64-bit compiler. I suppose I could get a different compiler, but why ???