dtl

// Using a DynamicDBView to read rows from the database.



// Read the contents of a table and print the resulting rows

void SimpleDynamicRead() {



	// Our query will be "SELECT * FROM DB_EXAMPLE"

	DynamicDBView<> view("DB_EXAMPLE", "*");



	// NOTE: We need to construct r from the view itself since we

	// don't know what fields the table will contain.

	// We therefore make a call to the DataObj() function to have the

	// table return us a template row with the correct number of fields

	// and field types.

	// We use this construction since we can't be guaranteed that the table

	// is non-empty & we want to still display column names in this case.

	variant_row s(view.GetDataObj());



	// Print out the column names

	vector<string> colNames = s.GetNames();

	for (vector<string>::iterator name_it = colNames.begin(); name_it != colNames.end(); name_it++)

	{

		cout << (*name_it) << " ";

	}

	cout << endl;



	// Print out all rows and columns from our query

	DynamicDBView<>::select_iterator print_it = view.begin();

	for (print_it = view.begin(); print_it != view.end(); print_it++)

	{

		variant_row r = *print_it;

		for (size_t i = 0; i < r.size(); i++)

		{

			cout << r[i] << " ";

		}

		cout << endl;

	}

}

Copyright © 2002, Michael Gradman and Corwin Joy.

Permission to use, copy, modify, distribute and sell this software and its documentation for any purpose is hereby granted without fee, provided that the above copyright notice appears in all copies and that both that copyright notice and this permission notice appear in supporting documentation. Corwin Joy and Michael Gradman make no representations about the suitability of this software for any purpose. It is provided "as is" without express or implied warranty.

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