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From "Gilles Bayon" <ibatis....@gmail.com>
Subject Re: Mapping data to subclasses
Date Thu, 12 Oct 2006 16:15:09 GMT
Online doc,


On 10/12/06, Per Magne Bjornerud <PMBjornerud@interlect.co.jp> wrote:
> Hello,
> I have a database where several subclasses are mapped to the same table.
> I'll stick to the standard example here. Assume
> Base class: Person
> Subclass: Employee
> Subclass: Customer
> In my application, I mostly use instances of Employee or Customer
> objects. But in the DB, they are both stored to the Person table. In
> addition to the object properties, they have a PersonType id to know
> which is which.
> Is there any way to set up iBatis mapping so the objects I get returned
> will be instances of the different subclasses, depending on the
> PersonType field?
> I want to do a very simple "SELECT * FROM Person WHERE Id = X" and map
> it to an object.
> Obviously identical <select> elements for each subclass and an
> additional lookup to know the type of each object before I select them
> isn't really an option. Is there a way for iBatis to handle this?
> I guess the alternative might be to create instances of Person objects
> and add a GetCorrectInstance() method that will return objects of
> correct subclass. If iBatis cannot help me do what I want, I'd also be
> happy for some tips, patterns or keywords to help me find the best
> possible workaround.
> --
> Per Magne Bjornerud


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