Charles,
It helps a little, but I note the use of proxy in the example you give. I am
enclosing the xml descriptor for my tables, and the two java classes in
question. In the hopes these will help.
What I am looking for is the Collection of Base Class Report Objects for the
Given treeId and nodeId as listed by query in one or more TreeNodeReport
Objects.
Thanks in advance,
Joe
PS: Sorry for being a newbie on this one...
On Wednesday 18 September 2002 10:26 am, Charles Anthony wrote:
> Hi Joseph,
>
> The design of your tables won't really help us to help you here.
>
> OJB is an Object-To-DB-mapping framework; your queries will/should (99% of
> the time) be based on objects.
>
> There is a section on the query
> document(http://jakarta.apache.org/ojb/query.html) that discusses joins.
> Unfortunately, on the apache site the document hasn't been transformend
> correctly. Here follows the XML source of the documentation. I hope this
> helps a bit.
>
> Cheers,
>
> Charles.
>
> <subsection name="joins">
> <p>
> Joins resulting from path expressions ("relationship.attribute") in
> criteria are automatically handled by OJB.
> Path expressions are supported for all relationships 1:1, 1:n and m:n
> (decomposed and non-decomposed)
> and can be nested.
> <br/><br/>
> The following sample looks for all articles belonging to the product group
> "Liquors".
> Article and product group are linked by the relationship "productGroup" in
> class Article:
>
> <source><![CDATA[
> <!-- Definitions for org.apache.ojb.ojb.broker.Article -->
> <class-descriptor
> class="org.apache.ojb.broker.Article"
> proxy="dynamic"
> table="Artikel"
>
> ...
> <reference-descriptor
> name="productGroup"
> class-ref="org.apache.ojb.broker.ProductGroup"
>
> <foreignkey field-id-ref="4"/>
> </reference-descriptor>
> </class-descriptor>
>
> <class-descriptor
> class="org.apache.ojb.broker.ProductGroup"
> proxy="org.apache.ojb.broker.ProductGroupProxy"
> table="Kategorien"
>
> ...
> <field-descriptor id="2"
> name="groupName"
> column="KategorieName"
> jdbc-type="VARCHAR"
> />
> ...
> </class-descriptor>
> ]]></source>
>
> <br/>
> The path expression includes the 1:1 relationship "productGroup" and the
> attribute "groupName":
>
> <source><![CDATA[
> Criteria crit = new Criteria();
> crit.addEqualTo("productGroup.groupName", "Liquors");
> Query q = QueryFactory.newQuery(Article.class, crit);
>
> Collection results = broker.getCollectionByQuery(q);
> ]]></source>
>
> </p>
> </subsection>
>
> >-----Original Message-----
>
> From: Joseph Campbell [mailto:[EMAIL PROTECTED]]
>
> >Sent: 18 September 2002 15:25
> >To: [EMAIL PROTECTED]
> >Subject: need a good join example... PLEASE HELP.
> >
> >
> >This may have been answered elsewhere but I am unable to locate it:
> >
> >I am in need of an example for a join query. Here is the
> >situation... two
> >tables that look like this....
> >
> >CREATE TABLE one (
> >keyid int not null,
> >blah1 char(10),
> >blah2 char(10),
> >blah3 char(10)
> >) PK = keyid;
> >
> >CREATE TABLE two (
> >fkid int not null,
> >key1 int not null,
> >key2 int not null
> >) PK = fkid, key1, key2, FK = fkid -> one(keyid)
> >
> >I am trying to get the collection of table one Objects for a
> >given table
> >two(key1, key2) combination. I think I have the XML
> >descriptors set up right
> >but am not sure. I have searched the website for an exmaple
> >of java code
> >with the XML descriptor that I can model after - but have as
> >yet been unable
> >to find one. Can anyone help with a small snip of what this
> >looks like? Or
> >maybe its in a page I just have not read yet and you can
> >forward me to the
> >URL?
> >
> >Thanks,
> > Joe Campbell
> >--
> >You laugh at me because I am different,
> >I laugh at you because you are the same.
> >-----------------------------------------------------
> >Joseph Campbell | EMAIL: [EMAIL PROTECTED]
> >Staff Consultant | URL: www.inventa.com
> >Inventa Technologies | PH: (856)914-5200
> >
> > | PGER: (888)454-0876
> >
> >-----------------------------------------------------
> >
> >
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You laugh at me because I am different,
I laugh at you because you are the same.
-----------------------------------------------------
Joseph Campbell | EMAIL: [EMAIL PROTECTED]
Staff Consultant | URL: www.inventa.com
Inventa Technologies | PH: (856)914-5200
| PGER: (888)454-0876
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