Patch for better exception use -- BadQuery w/Errnum patch part 1

Part 1 of broken up new version of BadQuery update patches after review by Warren.

In this case the BadQuery was being misused in this case and Warren suggested a new exception.

See http://lists.mysql.com/plusplus/7060 for reference

Diffs are from the current svn

Index: result.h

• result.h (revision 1779) +++ result.h (working copy) @@ -105,7 +105,7 @@ { if (!result_) { if (throw_exceptions()) { - throw BadQuery("Results not fetched"); + throw UseQueryError("Results not fetched"); } else { return Row();

Index: exceptions.h

• exceptions.h (revision 1779) +++ exceptions.h (working copy) @@ -235,6 +235,19 @@ };

+/// \brief Exception thrown no result set was returned in a fetch, 
+/// usually due to an error.
+
+class MYSQLPP_EXPORT UseQueryError : public Exception
+{
+public:
+	/// \brief Create exception object
+	explicit UseQueryError(const char* w = "") :
+	Exception(w)
+	{
+	}
+};
+

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