Question

Is there any possibility to preview changes before exporting to ORM ?
And can i somehow rollback changes if something went wrong ?

Answer 1

At this moment both the export changes list and rollback function are on the list of planned functions.

However regarding the rollback, I strongly recommend using versioning and revision system like SVN, where the control over the changes and backups is much more robust than what can be covered by ORM Designer.

Comments

Of course i'm using version control, but it's not hard to check before export what files are changed and take diff on them ;)

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That (and also that it is an useful thing to have) is why we are definitely going to add it :) I'll let you know when it is released.

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+1 for deselecting entities to be exported. Now that we've switched to annotations for new projects, there is a situation where ORM Designer touches every association and adds spaces at the end of lines which is forbidden by our coding standard.
So I have to revert all those files I did not edit but which were changed by the export.