Re: Anonymous keys

Hi Vagula,

Vagula wrote:
>  
> 
> Hi,
> 
>  
> 
>           I have some doubts though:
> 
>  
> 
>                    1. In the access attribute for an reference field (as
> given below in repository_user.xml) which is the best option?
> 
> a.      read only 
> 
> b.      read write 
> 
> c.      anonymous
> 

I would use anonymous fields or private fields without getter/setter in 
the POJO for the ?? fields (with access "readwrite" or "readonly" - if 
data never change).

> 2. When I use access=anonymous, I have to retrieve the references before
> I store the object. This is causing problem when I run the use case for
> 35 concurrent users. Any suggestions?
> 
>  
> 
> 3. When  I use access = read, I add the attributes in the Java bean. But
> when I run the application it is giving an error "Cannot Insert Null
> into a Not Null column"

If you set "readonly" the field will be ignored on insert. This could 
cause problems with the DB-table if the column doesn't allow null.

regards,
Armin

> 
>  
> 
> <class-descriptor
> class="com.inetpsa.pac.ojb.bean.ActivityDeclarationData"
> table="PACQTDEA">
> 
>           <field-descriptor id="1" name="id" column="ID"
> jdbc-type="INTEGER" primarykey="true" autoincrement="true"
> access="readonly"/>
> 
>           <field-descriptor id="2" name="individualid"
> column="INDIVIDUALID" jdbc-type="INTEGER" access= ?? />
> 
>           <field-descriptor id="3" name="activityid" column="ACTIVITYID"
> jdbc-type="INTEGER" access= ?? />
> 
>           <field-descriptor id="4" name="subactivityid"
> column="SUBACTIVITYID" jdbc-type="INTEGER" access= ?? />
> 
>           <field-descriptor id="5" name="entityId" column="ENTITY"
> jdbc-type="INTEGER" access= ?? />
> 
>           <field-descriptor id="6" name="period" column="PERIOD"
> jdbc-type="INTEGER" access= ?? "/>
> 
>           <field-descriptor id="7" name="comment" column="COMMENT"
> jdbc-type="VARCHAR" />
> 
>           <field-descriptor id="8" name="daysDeclared"
> column="DAYSDECLARED" jdbc-type="NUMERIC"
> conversion="com.inetpsa.pac.arch.ojb.util.Numeric2DoubleConvertor"/>
> 
>           <reference-descriptor
> class-ref="com.inetpsa.pac.ojb.bean.IndividualData" name="individual"
> auto-retrieve="false">
> 
>                    <foreignkey field-ref="individualid" />
> 
>           </reference-descriptor>
> 
>           <reference-descriptor
> class-ref="com.inetpsa.pac.ojb.bean.Activity" name="activity"
> auto-retrieve="false">
> 
>                    <foreignkey field-ref="activityid" />
> 
>           </reference-descriptor>
> 
>           <reference-descriptor
> class-ref="com.inetpsa.pac.ojb.bean.SubactivityData" name="subActivity"
> auto-retrieve="true">
> 
>                    <foreignkey field-ref="subactivityid" />
> 
>           </reference-descriptor>
> 
>           <reference-descriptor
> class-ref="com.inetpsa.pac.ojb.bean.EntityData" name="entityData"
> auto-retrieve="false">
> 
>                    <foreignkey field-ref="entityId" />
> 
>           </reference-descriptor>
> 
>           <reference-descriptor
> class-ref="com.inetpsa.pac.ojb.bean.PeriodicCalender" name="periodData"
> auto-retrieve="false">
> 
>                    <foreignkey field-ref="period" />
> 
>           </reference-descriptor>
> 
>                    <object-cache
> class="org.apache.ojb.broker.cache.ObjectCacheEmptyImpl"></object-cache>
> 
> </class-descriptor>
> 
>                    
> 
>           OJB version I use is 1.0.
> 
>  
> 
>           Thanks for the Help!
> 
>  
> 
> Regards,
> 
> Vagula 
> 
>  
> 
> -----Original Message-----
> From: Armin Waibel [mailto:[email protected]] 
> Sent: Wednesday, December 06, 2006 7:26 AM
> To: OJB Users List
> Subject: Re: Anonymous keys
> 
>  
> 
> Hi Vagula,
> 
>  
> 
> I'm sorry for the late reply - I was ill last week.
> 
>  
> 
> Vagula wrote:
> 
> 
> 
> 
>> Hi,
> 
> 
> 
> 
> 
>> What are the drawbacks of using the anonymous keys?
> 
> 
>> Will there be performance bottleneck?
> 
> 
> 
> 
> 
>>           I have read the material in OJB site, it doesn't talk about
> 
>> drawbacks.
> 
> 
>  
> 
> Did you read this?
> 
> http://db.apache.org/ojb/docu/guides/advanced-technique.html#How+do
> 
> This section describe how AK work. One drawback is that you can't use AK
> 
> 
>   (except in 1:1 refenences) if you want to cluster OJB. I don't know 
> 
> about a performance bottleneck when using AK, but I never made serious 
> 
> multi-threaded performance comparisons (with/without AK).
> 
>  
> 
> regards,
> 
> Armin
> 
>  
> 
> 
> 
> 
>> Regards,
> 
> 
>> Vagula
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
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