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Undo's & Locking
Be careful with your use of undo
If the user edited a form before clicking the undo button then the undo operation will discard the changes that had been made to the form
If the user did not edit the form before clicking the undo button then the undo operation will discard the changes that were made by the previous form submission
Locking
Pesermistic - if someone has the data don't let anyone else read it
optomistic - let both get the same data and let them save it, but when they go to save it check to see if the data has changed and tell them
By default save uses the optomistic approach, therefore EO has to remember (snap shot) the data it read
EOModeller check boxes
diamond = can read data into object
pad lock = use this attribute for optomistic locking - turn off for gifs etc to save lots of data transfer
Lect 5 Demo 1 through 3 ( Download Start 1 2 3)
Lect 5 Demo Instructions (Download )
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Page updated September 9, 2004
