Generating IDs (key attribute) in prepareForDML

Hello

I need an opinion of the most experienced developers ADF here.

When I insert a new line, I don't want to use a sequence number until I commit the data to the database. What I do is the following: when I am inserting a line in a view to fill the id (key attribute) with a default value (e.g. 0), then in the EntityImpl I overrride the function of prepareForDML and I inspect the value of the id. If its 0 I generate a sequence number and update its value. Is this a good practice or I'm doing wrong?

Thank you

The solution in the given blog should be used id you replace the prepareForDML() instead of the doDML() method. DoDML inside, you should not change other attributes lifecycle as it is already over. As you find yourself already, you should check that you only insert a new sequence if the insert operation (at least if you define a key). You must then configure the sequence so that the values are not cached.

However, this would not ensure a sequence of gap-less if that is your goal. You cannot ensure this in a web application. So prepare yourself for missing values.

Timo

Tags: Java

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