Re: fetching on joined table

Subject: Re: fetching on joined table
From: Chuck Hill <email@hidden>
Date: Mon, 11 Apr 2011 11:09:34 -0700

On Apr 11, 2011, at 3:12 AM, <email@hidden> wrote:

Hi Chuck,

Tables A, B, C, D haven't relationship but same fileds name.

If they don't have modeled relationships, then you can't use qualifiers.

When i'am using raw rows to translate my sql in webobjects and get my data, I don't have EOF entities but dictionnaries.

So I would like to know what the best practice on my case? create view with my sql request on database and fetching on view in my model?

I think the best practice would be to change the model (and the schema too, if needed) so that there are relationships and you are fetching entities. I very rarely need to do a raw row fetch. If you give us more information on the data, maybe we can suggest a better model.

Chuck

========================================

Message du : 11/04/2011
De : "Chuck Hill " <email@hidden>
A : email@hidden
Copie à : email@hidden
Sujet : Re: fetching on joined table

Hello Ray,

On Apr 8, 2011, at 5:16 PM, email@hidden wrote:

Hi,

I'm newbie on WebObjects and I have big problem to fetching on joined table.
Example :
I have my SQL like that :

A good rule with WebObjects is "If you are thinking about SQL, you are doing it wrong." There are times (i.e. when optimizing) when you do need to think about the SQL, but thinking in terms of objects is usually the better way.

select
a.id b.id as ID,
c.option as option,
decode(d.no, 1, 'one', 2, 'two', 'unknow') as order

WebObjects (EOF) does not do mixed table selects like this (unless you are selecting Raw Rows). It selects whole rows of tables and makes them into related Java objects.

from
ta a, tb b, tc c, td d
where
c.option in ('1', '2','3')
and c.option = b.option

How to translate this SQL request in EOF using qualifier or spec qualifier?

Thanks for your help.

What are the relationships in the model between A, B, C, and D? What are you trying to fetch?

Chuck

--
Chuck Hill Senior Consultant / VP Development

Practical WebObjects - for developers who want to increase their overall knowledge of WebObjects or who are trying to solve specific problems.
http://www.global-village.net/products/practical_webobjects

Chuck Hill Senior Consultant / VP Development

Practical WebObjects - for developers who want to increase their overall knowledge of WebObjects or who are trying to solve specific problems.

http://www.global-village.net/products/practical_webobjects

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