From: Warren Young
Date: December 30 2010 10:38pm
Subject: Re: Return the number of fields in a 'vector<Row> myresultset;'.
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On 12/30/2010 1:52 PM, Chris Morgan wrote:
>
> If you want the number of columns in a particular mysqlpp::Row, you
> need to use myslqpp::Row::size()

That, or you can check with the result set object:

	mysqlpp::StoreQueryResult res = query.store();
	cout << "Columns: " << res.num_fields() << endl;

> mysqlpp::StoreQueryResult myresultset = query.store();
>
> for (unsigned int i = 0; i<  myresultset.num_rows(); i++)
> {
>    std::cout<<  "Row "<<  i<<  " Size: "<<  myresultset[i].size()<<  std::endl;
> }

No need to check each row.  They'll all have the same number of columns. 
  Each Row object refers back to the ResultBase derivative that created 
it for things like column information, so they can't be mismatched.