[Digikam-devel] Update query fails

Marcel Wiesweg marcel.wiesweg at gmx.de
Tue May 31 20:49:18 BST 2016

Please check the context where it is called, but I am quite sure that there is 
a special meaning in setting album root to 0.
I'm sure there is a similar case with deleted images where album is set to 0, 
but the entry is preserved in case the image reappears at a different place 
(moving files where the removal is noticed first)


> Hello.
> I was facing this error from past few days:
> MariaDB [digikam]> update Albums set albumRoot=0 where id=10;
> > ERROR 1452 (23000): Cannot add or update a child row: a foreign key
> > constraint fails (`digikam`.`Albums`, CONSTRAINT `Albums_AlbumRoot
> > s` FOREIGN KEY (`albumRoot`) REFERENCES `AlbumRoots` (`id`) ON DELETE
> I figured out that as 'id' is AlbumRoots table is not 0. So 'albumRoot' in
> Images table can't be set to 0. This is I think the possible reason for FK
> constraint failing.
> I used this statement instead & it worked:
> MariaDB [digikam]> update Albums set albumRoot=1 where id=10;
> > Query OK, 0 rows affected (0.06 sec)
> > Rows matched: 1  Changed: 0  Warnings: 0
> Please look into this.
> Regards

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