Update/Delete Record items in a Stream

[mandoza]

many thanks for your great efforts , is there any other alternative to load just one field say :

myRec.LastName := ReadStringFromStream(LoadingStream); let's update myRec.LastName with a new value
myRec.LastName := 'Wombat'; // to change
not the whole record

then save only this new field value , something like update then save whithout loading the whole record just the target one .
I hope you get me now .

like this step :
https://www.thoughtco.com/create-dat...-files-1058003

please read the "Change and Update" part