Thanks for your interest. I understood. 

 Regards,
 Özkan ÖZMEN
 CENTER OF LIBRARY
 BALIKESIR UNIVERSITY - TURKEY


----- Orijinal Mesaj -----
Kimden: "Chris Cormack" <[email protected]>
Kime: "Ozkan OZMEN" <[email protected]>
Kk: "koha" <[email protected]>
Gönderilenler: 13 Aralık Pazar 2015 23:26:50
Konu: Re: [Koha] Koha 3.20.03 - Some reserve informations are inserting asNULL

* Ozkan OZMEN ([email protected]) wrote:
> 
> Hi all,
> 
> I saw some columns as NULL in old_reserves table on database. These: 
> espacially itemnumber and biblionumber. 
> Do you know why these field are recording as NULL?
> I want to learn this because our circulation report involved some NULL items.
> 
> 
> I am looking forward to your helps.
> Thank you.

Hi Ozkan

They aren't recording as null, but what happens is when the item or
biblio is deleted, there is an ON DELETE CASCADE rule,

For example

CONSTRAINT old_reserves_ibfk_2 FOREIGN KEY (biblionumber) REFERENCES
biblio (biblionumber)
    ON DELETE SET NULL ON UPDATE SET NULL,

This is for referential integrity, otherwise we have biblonumbers or
items that have been deleted stored in those tables.  

So those will be for items and biblio records that have been deleted.

Hope this helps

Chris

> 
> 
> Regards,
> Özkan ÖZMEN
> CENTER OF LIBRARY
> BALIKESIR UNIVERSITY - TURKEY
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-- 
Chris Cormack
Catalyst IT Ltd.
+64 4 803 2238
PO Box 11-053, Manners St, Wellington 6142, New Zealand
YASAL UYARI:
Bu elektronik posta ve onunla iletilen butun dosyalar kisiye ozeldir ve sadece 
gondericisi tarafindan almasi amaclanan yetkili gercek ya da tuzel kisinin 
kullanimi icindir. Eger soz konusu yetkili alici siz degilseniz bu elektronik 
postanin icerigini aciklamaniz, kopyalamaniz, yonlendirmeniz ve kullanmaniz 
kesinlikle yasaktir. Bu mesajin gonderilmek istendigi kisi degilseniz (ya da bu 
e-posta'yi yanlislikla aldiysaniz), lutfen yollayan kisiyi haberdar ediniz ve 
mesaji sisteminizden derhal siliniz. Kurumumuz, bu mesajin icerdigi bilgilerin 
dogrulugu veya eksiksiz oldugu konusunda herhangi bir garanti vermemektedir. Bu 
nedenle bu epostanin ne sekilde olursa olsun iceriginden, iletilmesinden, 
alinmasindan ve saklanmasindan kurumumuz sorumlu degildir. Bu mesajdaki 
gorusler yalnizca gonderen kisiye ait olup, her zaman kurumumuzun goruslerini 
yansitmayabilir. 
Bu e-posta, bilinen butun bilgisayar viruslerine karsi anti-virus sistemimiz 
tarafindan taranmistir. Ancak yollayici, bu e-posta mesajinin virus 
icermedigini garanti etmez ve meydana gelebilecek zararlardan dogacak hukuki ve 
mali hic bir sorumlulugu kabul etmez.

DISCLAIMER:
This e-mail and any files transmitted with it are confidential and intended 
solely for the use of the individual or entity to whom they are addressed. If 
you are not the intended recipient you are hereby notified that any 
dissemination, forwarding, copying or use of any of the information is strictly 
prohibited. If you are not the intended recipient (or have received this e-mail 
by mistake), please notify the sender and delete it from your system 
immediately. Our university makes no warranty as to the accuracy or 
completeness of any information contained in this message and hereby excludes 
any liability of any kind for the information contained therein or for the 
information transmission, reception, storage or use of such in any way 
whatsoever. The opinions expressed in this message may belong to sender alone 
and may not necessarily reflect the opinions of our university. 
This e-mail has been scanned by our anti-virus system for all known computer 
viruses. In doing so, however, sender cannot guarantee that virus or other 
forms of data corruption may not be present and do not take any legal or 
financial responsibility in any occurrance.

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