Problems with NHibernate mapping and Identity

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C#

NHibernate

Mapper

Hello every body, I need your help to let me know how to fix this two problems

1- What should I do If I have a stored procedure which return different table structure with different columns name and column count How can I map these results in one entity ? Can I use the DataSet or the DataTable objects to solve this case ?
2- What should I do if I have no real id of the result suppose a stored procedure which selects data from different tables without their primary keys, How can I tell the NHibernate to make an incremental id to the returned entity ?