Hey all,
I am new to object relational bridges and I am trying to accomplish a fairly complex
site. I have gotten pretty far I think looking through the demos and reading the a
archives. Bows especially to Thomas for the helping hand he has given people for
quite some time.
Anyway, onto my two main questions.
Question One: I am using PersistentNestedFieldMaxPerformanceImpl so that I can use
"->" in the repository for nested objects. Are there plans to incorporate this in
with other PersistentField Attribute implementations? Is the only difference between
PersistentNestedFieldMaxPerformanceImpl and the default implementation that it
accesses fields directly?
Question Two: I have looked through the demos, but I am missing a piece of
understanding about bridges. I have a simple reference-descriptor in my repository
file as shown in the code below. I was trying to load a region based on a region id.
I could not figure out how to auto-load a new RegionVO if regionId alone changed or
was about to be inserted. This was "ok" as I knew I could manually load the new
RegionVO object using a DAO. But here is the problem I was having: I would try to
insert the LocationVO object before retrieving the RegionVO object. Instead of just
inserting the populated regionId into the database, it would insert try to insert null
and would null out the regionId during store(). When I got the RegionVO first
manually and populated it, regionId would be stored correctly. Why did I have to get
the RegionVO first? The debug message I got about the field is just below:
"[org.apache.ojb.broker.core.PersistenceBrokerImpl] INFO: Cascade store for this
reference (RegionVO) was set to false."
Thanks for your wisdom!!!
JohnE
<class-descriptor class="LocationVO" table="location" auto-update="true"
auto-delete="true">
<field-descriptor
name="memberId"
column="mid"
jdbc-type="INTEGER"
primarykey="true"/>
<field-descriptor
name="regionId"
column="regionid"
jdbc-type="INTEGER"/>
<reference-descriptor
name="region"
class-ref="RegionVO">
<foreignkey field-ref="regionId"/>
</reference-descriptor>
</class-descriptor>
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