Reference entities in View Objects

Hi,
I have several questions related to the use of multiple entities in a View Object.
Suppose I have three entity objects: Product (N) <-> (0..1) Manufacturer (N) -> (1) State.
(In a state there are several manufacturers, and each manufacturer makes several products. Of several products the manufacturer is unknown, so that's why there's a 0..1 on the manufacturer side)
I want to create a view on products, ProductView, and I want to display the manufacturer name and the state name, so I've added these as reference entities to the ProductView.
When doing so, several questions popped up:
1) The View Object Wizard did not generate a where clause. If this is because I use more than one reference entity, then I don't understand why it wouldn't be able to generate the proper whereclause, since I've selected the associations between the entity objects, so it should be able to derive a proper whereclause from that.
2) Left outer joins can only be performed by adding '(+)' to the query. However I would like to use the LEFT OUTER JOIN clause, since that is a bit more flexible (because I can add several expressions to the ON() clause. I can only use a LEFT OUTER JOIN if I create an expert mode query and do it myself. It would be nice if jdeveloper supported this type of query.
3) In the query tab, the query uses weird aliases for the fieldnames. Since there was already an Id attribute in the base view object, the primary key of the second and third entityes had been named Id1 and Id2. I immediately renamed those to manufacturer_id (as I've read in one of the howto's on this forum). Still, the query uses the aliases ID1 and ID2 ('Manufacturer.ID AS ID1'), which makes the whereclause that I must right unreadable. Again, the only way to change this is to write my own query in expert mode.
Thoughts?
Greetings,
Ivo

[list]
[*]Would be nice if BC4J supported left outer joins
We do. This is exactly why the Expert Mode Query feature is there.
In addition to LEFT OUTER JOIN there are hundreds of possible
database query tricks that developers want to leverage in their SQL
statements. Expert Mode gives you a generic way to handle all
of them.
[*]Weird aliases in the query
Did you check the attribute settings in your VO to see what aliases are specified there at the bottom of the panel? These are what gets used by the query when BC4J "calculates" the query for you (i.e. when it's not an expert mode query).
[*]The where clause didn't contain the '(+)' thingees, so the view did not perform an outer join
Outer joins require expert mode. BC4J doesn't by default ever generate outer-join queries itself.
[*]Derived view worked in the tester, but JClient master/detail generation didn't work
This is Bug# 2684863 that we're looking at for 9.0.4
[*]ViewLink inherited from base object doesn't show up for inclusion in datamodel
This is Bug# 2684866 that we're investigating for 9.0.4
You can create a new view link between the extended VO and either the existing destination view, or a VO extended from it, and it should work in the data model window.
[list]

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Hi
Thank you for reading my post
I have create 3 Business components for 3 of my database tables and now
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Chris,
Thank you for looking at my problem. The row is not inserted into the table (on the view page) with the code I shared. The criteria for the table's VO is simply a select all, with no where clause, so I don't think I'm excluding it... Upon hitting a commit button, the new row does pop in to the table witch is further evidence that the criteria for the VO isn't excluding the new row.
I have tried insertRowAtIndex(), even before I posted this with no luck.
BTW, if I add to the bottom of the code I shared, getDBTransaction().commit; or getDBTransaction().postChanges(), the row does pop into the table when the "view" page is navigated to.
Am I doing something wrong with my construction of my ViewObject? It is a composition (I got that wrong in my initial post) between two entities. The Item entity is updateable, and not a reference using an association between the two entities on the Badge attribute.
I am trying to have new composite VO rows always show up as the first item in a table. I've read that the Row.STATUS_NEW will always do this... so I'm trying to avoid posting/committing the new row. I'm also not above inserting at a particular location, but some of the pages I hope to use this pattern with re-execute the VO every time the page is rendered, instead of just rebinding the Iterator with the VO rowsets. I'm being led to believe that if a Row is posted or committed, re-executing the query will resort all rows based on 'order by', etc.
Also, I have setup a similar yet even more complicated example using three entities. I was able to make this work as expected. The difference is that I was using an ADF Creation Form. ( I did have some work in the model to make all the keys line up though.... posting order... etc.).
I have gotten similar things like this to work with single entities VOs. I'm just having trouble when I do composite VOs. That is supported, isn't it?
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If I do that on a view that didn't have other views as children defined in the AM I don't have any problem and it works like I want.
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Thanks in advance,
Lynn

Hi,
I am also interested in a best-practice note from oracle.
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http://forums.ni.com/ni/board/message?board.id=170&thread.id=159571&view=by_date_ascending&page=1
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