Load from DB, edit and save to db (update)

Hey there,
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I've got a question about editing a dataset and save it to the same db table as I loaded from.
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In DB Read I use "Populate Field". The table fields with setting the relating field names in the style "modelread.tablefield" show the data. That works.
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But how about saving changes? I mean, when I set "update" and "whole form field" in DB Save action, nothing really is saving. Thats obviously, cause all fields are named with "modelread.tablefield" but actually the field names have to fit just the table field names... How can I fix that?

if your fields names have the model then you may add this to the "Save Data" data sets setting:

{data:model_name}

Hi , I have a Question , in this excercise how do you search the data to show into the "modelread.tablefield", I mean , how do you add a search field that works with luken's exercise.
Thanks.