Re: [Vote] Can QueryCustomizer be used to suppress foreign key qu eries

[Jakob Braeuchi <jb...@gmx.ch>]

hi all,

i just commited the following change:

an empty collection is returned if the query customizer return a null query.
the null query is handled in 
PersistenceBrokerImpl#getCollectionByQuery(Class, Query, boolean).

hth
jakob


Charles Anthony wrote:

>+1
>
>  
>
>>-----Original Message-----
>>From: Jakob Braeuchi [mailto:jbraeuchi@gmx.ch]
>>Sent: 27 March 2003 21:25
>>To: OJB Users List
>>Subject: [Vote] Can QueryCustomizer be used to suppress foreign key
>>queries
>>
>>
>>hi all,
>>
>>does everyone agree ?
>>
>>jakob
>>
>>Lance Eason wrote:
>>
>>    
>>
>>>I'd think an empty collection so the client doesn't have to 
>>>      
>>>
>>make any special concessions for null.
>>    
>>
>>>-----Original Message-----
>>>From: Jakob Braeuchi [mailto:jbraeuchi@gmx.ch]
>>>Sent: Thursday, March 27, 2003 1:12 PM
>>>To: OJB Users List
>>>Subject: Re: Can QueryCustomizer be used to suppress foreign 
>>>      
>>>
>>key queries
>>    
>>
>>>hi lance,
>>>
>>>you'e the query cannot be suppressed.
>>>btw. what should be returned for a suppressed query, null or an empty 
>>>collection ?
>>>
>>>jakob
>>>
>>>Lance Eason wrote:
>>>
>>> 
>>>
>>>      
>>>
>>>>I have a table that may have child records in two other 
>>>>        
>>>>
>>tables.  This easy enough to map, I just create the 
>>collection-descriptors mapping to the two child tables and OJB 
>>issues queries to populate these collections.  The wrinkle is 
>>that these relationships are only applicable to a small subset 
>>of the rows in the table and I can tell from the other data in 
>>the row whether they are applicable or not.  There's no 
>>functional issue here, but I'd rather not be doing unnecessary 
>>database queries on all the rows I can clearly tell there is 
>>no need to pursue these two relationships.  Is there any way 
>>to enable or suppress relationships on a row by row basis?
>>    
>>
>>>>QueryCustomizer looks promising as it takes the instance for 
>>>>        
>>>>
>>the row and gets to decide the specific query that's executed 
>>to populate the collection for that instance.  I don't see a 
>>way to entirely suppress a query though.  Is there one?
>>    
>>
>>>>
>>>>   
>>>>
>>>>        
>>>>
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>>>
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>>    
>>
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Mailing list archive problems..

[Spiegs <sp...@spiegs.com>]

I am a ojb newbie struggling to get up and running with mysql. I have
experienced problems trying to use the mailing list archive at
http://db.apache.org/ojb/mail-lists.html. Clicking either 'Archive' link
results in an error on the page.You can get around this by clicking on
'List Index' and scrolling down to the ojb mail lists. 

However, clicking on the ojb-user@db.apache.org link, then 'All', then
drilling down all the way to an individual message, only '$msgHeaders'
is displayed. 

I experienced this a about two weeks ago and when I saw it still
occurred today I decided to post to the list. Hopefully this was the
appropriate place to report it and it is an easy issue to fix.

-- 
Spiegs <sp...@spiegs.com>