When you instanciate a persisten object in google app engine the
object automatically is assigned with a value to its primary field
even before persisting it in the database.
sample class:
MyClass{
@PrimaryKey @Persistent(valueStrategy=IdGeneratorStrategy.IDENTITY)
private Long id;
}
But in the case with rdbms, the primary field is not assigned with a
value. Its value is created when the persistent object is saved into
the database. But I need to use the value of its primary field before
persisting it. What is the proper way to do this, in a sense it would
also work using any other underlying supported datasource?
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