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From "Adriano Crestani" <adrianocrest...@gmail.com>
Subject Re: [DAS Java] created SDO graph doubt
Date Sat, 07 Apr 2007 21:00:19 GMT
Last doubt moved to thread: "[DAS Java] created SDO graph doubt 2"

Adriano Crestani

On 4/7/07, Adriano Crestani <adrianocrestani@gmail.com> wrote:
>
> Another doubt:
>
> I have the following tables on my database:
>
> create table B (
>     ID INTEGER NOT NULL PRIMARY KEY
> );
>
> create table A (
>     ID INTEGER NOT NULL PRIMARY KEY,
>     B_ID INTEGER,
>     FOREIGN KEY (B_ID) REFERENCES B(ID)
> );
>
> OK, then I was analyzing the generated sdo graph when I execute the query
> "select * from A, B;", I got something like this:
>
> Graph1:
> http://cwiki.apache.org/confluence/download/attachments/45093/das_graph.JPG
>
> I understand the column B_ID would be considered only an integer column
> when of table A when there is no B table returned on the query. However, the
> B table is also returned on the query and as the B_ID column is a FK to the
> table B, shouldn't the graph be like this?:
>
> Graph2: http://cwiki.apache.org/confluence/download/attachments/45093/das+
> graph+as+I+suppose+it+shoud+be.JPG
>
> This way I think the data returned by the query would be better
> represented on the graph. Maybe there is a reason for the graph to be
> generated as Graph1 instead of Graph2.
> What do you say guys?
>
> Adriano Crestani
>
> On 4/5/07, Adriano Crestani <adrianocrestani@gmail.com> wrote:
> >
> > Thanks kelvin ; )
> >
> > Adriano Crestani
> >
> > On 4/4/07, Kevin Williams <kevincbw@qwest.net> wrote:
> > >
> > > The RDB DAS will only populate a graph with data returned from the
> > > used
> > > query.  If you want a graph that contains data from related tables
> > > then
> > > the query provided must return that data (typically a join).  The
> > > relationship tests in the test suite demonstrate this.
> > > --Kevin
> > >
> > > Adriano Crestani wrote:
> > >
> > > > Let me try to explain my doubt:
> > > >
> > > > Lets suppose I create a select command and execute it. The returned
> > > > ResultSet has an attribute that belongs to the table X and is a FK
> > > to the
> > > > table Y, but no Y attribute is contained in the ResultSet. The
> > > > question is:
> > > > does the das create, and also populate, the SDO graph only with the
> > > > metadata
> > > > and data contained in the ResultSet or the das also adds to the SDO
> > > graph
> > > > the referenced Y table and its attributes and keep doing it till
> > > there
> > > > is no
> > > > more referenced table?
> > > >
> > > > I expect to be clear enough ; )
> > > >
> > > >
> > > > Adriano Crestani
> > > >
> > >
> > >
> > >
> > > ---------------------------------------------------------------------
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> > >
> > >
> >
>

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