I have the same question myself, but haven't yet figured out how to handle that situation.
Anyone else know? On 9/20/05, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote: > If iBATIS is doing these steps > > Product product = new Product(); > product.getPrice().setAmount(amount); > > the Product constructor has to create a Price instance as side-effect. > My question is: What do you do in case the Product does not need to have a > related Price instance for each Product? > > > Volker > > -----Ursprüngliche Nachricht----- > Von: Dan Bradley [mailto:[EMAIL PROTECTED] > Gesendet: Montag, 19. September 2005 22:11 > An: [EMAIL PROTECTED] > Cc: [email protected] > Betreff: Re: Mapping Composition (aka composite property, aka value > objects) > > > Of course, after being stuck on it for a while, I figured it out right > after I posted the question: > > <typeAlias alias="product" type="com.foo.Product" /> > <resultMap id="result" class="product"> > <result property="name" column="name" /> > <result property="description" column="description" /> > <result property="price.amount" column="amount" /> > <result property="price.currency" column="currency_code" /> > </resultMap> > > It appears that the Product class must have a Price instance that is > initialized, not null. In other words it looks like iBATIS doesn't do: > > Price price = new Price(); > price.setAmount(amount); > Product product = new Product(); > product.setPrice(price); > > But instead does: > > Product product = new Product(); > product.getPrice().setAmount(amount); > > Take this all with a grain of salt - I'm new to iBATIS! > > On 9/19/05, Larry Meadors <[EMAIL PROTECTED]> wrote: > > Can you explain more how the model is in Java, and in the database? > > > > Larry > > > > > > On 9/19/05, Dan Bradley <[EMAIL PROTECTED]> wrote: > > > I have one entity, a Product, which holds a Price as a composed (not > > > related) entity. A Price is a numeric value and a currency code as a > > > String. Prices don't have a distinct identity in the database - they > > > are value objects, so this is not the more usual persistent entity to > > > persistent entity relationship mapping. > > > > > > How would you map this using iBATIS? I've tried a variety of things > > > without success and can't yet find any documentation that covers this > > > situation. Thanks. > > > >
