使用sql.prepare获取多行结果

rowset<row> rs = (sql.prepare << "select * from tb_test");

for(rowset<row>::iterator it = rs.begin();it != rs.end();it++){
	const row& r = *it;
	cout << "id : " << r.get<int>(0)
			<< " name : " << r.get<string>(1)
			<< endl;
}