[Digikam-devel] Update query fails

Swati Lodha swatilodha27 at gmail.com
Sun Jun 5 20:24:12 BST 2016


Please find attached patch for facesdb.

Committing on git/master. Compiles without error.

Thank you.
ᐧ

On Sun, Jun 5, 2016 at 2:38 PM, Swati Lodha <swatilodha27 at gmail.com> wrote:

> I've now added  #include "digikam_debug.h"  under *Local includes *for
> qCDebug statement.
>
>>
> On Sun, Jun 5, 2016 at 2:33 PM, Gilles Caulier <caulier.gilles at gmail.com>
> wrote:
>
>> Patch is fine to commit in git/master.
>>
>> qCDebug(debug namespace) is the reight way to print statements on the
>> console. At run time, there are run to enable/disable prints.
>>
>> debug namespace are declared in /core/app/utils/digikam_debug.h
>>
>> Gilles Caulier
>>
>> 2016-06-05 10:44 GMT+02:00 Swati Lodha <swatilodha27 at gmail.com>:
>>
>>> Please fnd the attached patch. Two changes made to the thumbsdb.cpp file:
>>>
>>> 1) Added ";" to the SQL queries.
>>>
>>> 2) 2 TODOs were mentioned to check the return status. So I put the query
>>> state result in qCDebug() to check ithe query state.
>>> Is this done correctly?
>>>
>>>>>>
>>> On Sun, Jun 5, 2016 at 12:44 PM, Swati Lodha <swatilodha27 at gmail.com>
>>> wrote:
>>>
>>>> I'll make sure from now on, I make these fixes in master branch. And
>>>> will also write more precise commit messages.
>>>>
>>>> I'll read this page and take a care in future.
>>>>
>>>> Thank you.
>>>>
>>>>>>>>
>>>> On Sun, Jun 5, 2016 at 11:46 AM, Gilles Caulier <
>>>> caulier.gilles at gmail.com> wrote:
>>>>
>>>>> Another remark : A fix done in master can be simply synchronized in
>>>>> your devel branch easily with git. No need to make a new dedicated commit
>>>>> in your branch. Later, when we merge back your branch to master, this will
>>>>> be more problematic.
>>>>>
>>>>> I explain well in this wiki page :
>>>>>
>>>>>
>>>>> https://community.kde.org/Digikam/GSoC2014#Branches_Creation_and_Maintenance
>>>>>
>>>>> Take a care yo your path in git repository about your devel banch...
>>>>>
>>>>> Gilles Caulier
>>>>>
>>>>> 2016-06-05 8:11 GMT+02:00 Gilles Caulier <caulier.gilles at gmail.com>:
>>>>>
>>>>>> The PR ???
>>>>>>
>>>>>> I see your commit in your git developpement branch.
>>>>>>
>>>>>> I think this simple fixes can be committed directly in git master for
>>>>>> production. There are no intrusive and do not introduce new feature.
>>>>>>
>>>>>> On remark about your commits : make it more atomic as possible. Your
>>>>>> commit introduce 2 fixes : one for all missing ";" at end of SQL
>>>>>> statements, one other to fix the mess between image and video metadata DB
>>>>>> scan.
>>>>>>
>>>>>> Gilles Caulier
>>>>>>
>>>>>> 2016-06-05 0:46 GMT+02:00 Swati Lodha <swatilodha27 at gmail.com>:
>>>>>>
>>>>>>> I've sent the PR. Please review.
>>>>>>>
>>>>>>>>>>>>>>
>>>>>>> On Sun, Jun 5, 2016 at 3:41 AM, Swati Lodha <swatilodha27 at gmail.com>
>>>>>>> wrote:
>>>>>>>
>>>>>>>> Yes.
>>>>>>>>
>>>>>>>> I'll commit now. Was waiting for verification.
>>>>>>>>
>>>>>>>> Thank you.
>>>>>>>>>>>>>>>>
>>>>>>>> On Sun, Jun 5, 2016 at 3:39 AM, Gilles Caulier <
>>>>>>>> caulier.gilles at gmail.com> wrote:
>>>>>>>>
>>>>>>>>> The patch sound good.
>>>>>>>>>
>>>>>>>>> Did you have a working ssh connexion now to commit yourself in KDE
>>>>>>>>> repository ?
>>>>>>>>>
>>>>>>>>> `Gilles Caulier
>>>>>>>>>
>>>>>>>>> 2016-06-04 20:43 GMT+02:00 Swati Lodha <swatilodha27 at gmail.com>:
>>>>>>>>>
>>>>>>>>>> Final patch for coredb.cpp
>>>>>>>>>>
>>>>>>>>>> Thank you.
>>>>>>>>>>>>>>>>>>>>
>>>>>>>>>> On Fri, Jun 3, 2016 at 11:44 PM, Gilles Caulier <
>>>>>>>>>> caulier.gilles at gmail.com> wrote:
>>>>>>>>>>
>>>>>>>>>>> This patch sound fine.
>>>>>>>>>>>
>>>>>>>>>>> I would to know the Marcel viewpoint here, just to be sure.
>>>>>>>>>>>
>>>>>>>>>>> Take a care, the patch version 1 is also included in this one.
>>>>>>>>>>>
>>>>>>>>>>> Gilles Caulier
>>>>>>>>>>>
>>>>>>>>>>> 2016-06-02 21:29 GMT+02:00 Swati Lodha <swatilodha27 at gmail.com>:
>>>>>>>>>>>
>>>>>>>>>>>> Check this patch too.
>>>>>>>>>>>>
>>>>>>>>>>>> Thank you.
>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>> On Fri, Jun 3, 2016 at 12:37 AM, Swati Lodha <
>>>>>>>>>>>> swatilodha27 at gmail.com> wrote:
>>>>>>>>>>>>
>>>>>>>>>>>>> Please check this patch.
>>>>>>>>>>>>>
>>>>>>>>>>>>> Sorry for inconvenience.
>>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>> On Thu, Jun 2, 2016 at 11:56 PM, Swati Lodha <
>>>>>>>>>>>>> swatilodha27 at gmail.com> wrote:
>>>>>>>>>>>>>
>>>>>>>>>>>>>> Please find attached patch file for the same.
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> Thank you.
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>> On Thu, Jun 2, 2016 at 8:57 PM, Swati Lodha <
>>>>>>>>>>>>>> swatilodha27 at gmail.com> wrote:
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> Hello
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> In coredb.cpp:4547 ";" is missing after the UPDATE query.
>>>>>>>>>>>>>>> This change should be committed?
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> Regards
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> On Wed, Jun 1, 2016 at 6:14 PM, Richard Mortimer <
>>>>>>>>>>>>>>> richm+digikam at oldelvet.org.uk> wrote:
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> On 01/06/2016 10:12, Swati Lodha wrote:
>>>>>>>>>>>>>>>> > I understand this now. Thank you for clarification.
>>>>>>>>>>>>>>>> >
>>>>>>>>>>>>>>>> > So as it mentioned around coredb.cpp:549
>>>>>>>>>>>>>>>> >
>>>>>>>>>>>>>>>> >     549  // We need to work around the table constraint,
>>>>>>>>>>>>>>>> no we want to
>>>>>>>>>>>>>>>> >     delete older stale albums with
>>>>>>>>>>>>>>>> >     550  // the same relativePath, and adjust
>>>>>>>>>>>>>>>> relativePaths depending on
>>>>>>>>>>>>>>>> >     albumRoot.
>>>>>>>>>>>>>>>> >
>>>>>>>>>>>>>>>> >
>>>>>>>>>>>>>>>> > I think that this needs to be done?
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> It is all part of the bigger picture that needs considering
>>>>>>>>>>>>>>>> to allow
>>>>>>>>>>>>>>>> referential integrity to be applied across the (MySQL)
>>>>>>>>>>>>>>>> database. I don't
>>>>>>>>>>>>>>>> have the years of experience with digikam that Marcel does
>>>>>>>>>>>>>>>> but I think
>>>>>>>>>>>>>>>> the following is required:
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> 1 - apply "ideal" referential integrity to the MySQL
>>>>>>>>>>>>>>>> digikam schema
>>>>>>>>>>>>>>>> (mostly done).
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> 2 - now identify where things break down due to interaction
>>>>>>>>>>>>>>>> with the
>>>>>>>>>>>>>>>> outside world (file systems, other photo editors/tools).
>>>>>>>>>>>>>>>> Generally I
>>>>>>>>>>>>>>>> think this is easy to spot and is normally the root of an
>>>>>>>>>>>>>>>> information
>>>>>>>>>>>>>>>> hierarchy. (tags tree, albums, album roots spring to mind).
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> I think that digikam has been pretty consistent with using
>>>>>>>>>>>>>>>> a magic "0"
>>>>>>>>>>>>>>>> value to represent where something no-longer fits into a
>>>>>>>>>>>>>>>> hierarchy but
>>>>>>>>>>>>>>>> is likely to re-appear in due course.
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> 3 - Once identified the architectural decision is how to
>>>>>>>>>>>>>>>> handle it in a
>>>>>>>>>>>>>>>> database configured to enforce referential integrity. Bear
>>>>>>>>>>>>>>>> in mind that
>>>>>>>>>>>>>>>> this needs to continue to support SQLite too without having
>>>>>>>>>>>>>>>> to add too
>>>>>>>>>>>>>>>> many special cases. Note that SQLite is capable of
>>>>>>>>>>>>>>>> supporting
>>>>>>>>>>>>>>>> referential integrity so the choice may be to adopt the
>>>>>>>>>>>>>>>> same solution
>>>>>>>>>>>>>>>> for both.
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> Really the choices for handling the orphaned items are:
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> a - disable referential integrity on those affected fields.
>>>>>>>>>>>>>>>> That is
>>>>>>>>>>>>>>>> almost trivial to implement but does negate some of the
>>>>>>>>>>>>>>>> benefits.
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> b - add "special" internal rows that can be used to collect
>>>>>>>>>>>>>>>> these
>>>>>>>>>>>>>>>> temporarily orphaned nodes. I know that there is one at the
>>>>>>>>>>>>>>>> root of the
>>>>>>>>>>>>>>>> tags tree for MySQL. Note they are a bit tricky to arrange
>>>>>>>>>>>>>>>> because they
>>>>>>>>>>>>>>>> really need to be created with a primary key of zero to
>>>>>>>>>>>>>>>> match the
>>>>>>>>>>>>>>>> existing behaviour of putting zero in there.
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> c - change to use null instead of a magic placeholder
>>>>>>>>>>>>>>>> value. That is
>>>>>>>>>>>>>>>> probably a purer solution but does create differences
>>>>>>>>>>>>>>>> between SQLite and
>>>>>>>>>>>>>>>> MySQL.
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> I'd probably suggest that option b is the right one to
>>>>>>>>>>>>>>>> minimise chances
>>>>>>>>>>>>>>>> of short/medium term breakage but would be interested to
>>>>>>>>>>>>>>>> know what
>>>>>>>>>>>>>>>> others think.
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> Regards
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> Richard
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> P.S. even if b & c are chosen there are some potential
>>>>>>>>>>>>>>>> issues that may
>>>>>>>>>>>>>>>> occur if multiple orphaned tags, folders, images have the
>>>>>>>>>>>>>>>> same name.
>>>>>>>>>>>>>>>> That will trip up with existing "unique" constraints on the
>>>>>>>>>>>>>>>> database. I
>>>>>>>>>>>>>>>> suspect that this should just be left as "good enough" for
>>>>>>>>>>>>>>>> now.
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> >
>>>>>>>>>>>>>>>> > Regards
>>>>>>>>>>>>>>>> > ᐧ
>>>>>>>>>>>>>>>> >
>>>>>>>>>>>>>>>> > On Wed, Jun 1, 2016 at 2:28 PM, Marcel Wiesweg <
>>>>>>>>>>>>>>>> marcel.wiesweg at gmx.de
>>>>>>>>>>>>>>>> > <mailto:marcel.wiesweg at gmx.de>> wrote:
>>>>>>>>>>>>>>>> >
>>>>>>>>>>>>>>>> >     Have a look at the (rather complex) CollectionScanner.
>>>>>>>>>>>>>>>> >
>>>>>>>>>>>>>>>> >     The problem is the nature of our scan, which will
>>>>>>>>>>>>>>>> always run in all
>>>>>>>>>>>>>>>> >     kinds of
>>>>>>>>>>>>>>>> >     race conditions with the file system.
>>>>>>>>>>>>>>>> >
>>>>>>>>>>>>>>>> >     When a folder is moved, we may notice that it is
>>>>>>>>>>>>>>>> removed at the previous
>>>>>>>>>>>>>>>> >     location. Later, we see it appear at the new
>>>>>>>>>>>>>>>> location. It would be
>>>>>>>>>>>>>>>> >     unfortunate
>>>>>>>>>>>>>>>> >     to have completely deleted all album metadata in the
>>>>>>>>>>>>>>>> meantime.
>>>>>>>>>>>>>>>> >     Therefore, it
>>>>>>>>>>>>>>>> >     is made a stale album, which can be resurrected later
>>>>>>>>>>>>>>>> if a new place
>>>>>>>>>>>>>>>> >     can be
>>>>>>>>>>>>>>>> >     identified.
>>>>>>>>>>>>>>>> >
>>>>>>>>>>>>>>>> >     This is done in a similar way for images. Here, we
>>>>>>>>>>>>>>>> can identify them by
>>>>>>>>>>>>>>>> >     content, so the storage of "removed" images is even
>>>>>>>>>>>>>>>> more extensively
>>>>>>>>>>>>>>>> >     done.
>>>>>>>>>>>>>>>> >
>>>>>>>>>>>>>>>> >
>>>>>>>>>>>>>>>> >
>>>>>>>>>>>>>>>> >     > This query is executed in
>>>>>>>>>>>>>>>> core/libs/database/coredb.cpp:576 in the function
>>>>>>>>>>>>>>>> >     > to create stale Albums, that is why the albumRoot
>>>>>>>>>>>>>>>> has been set to 0.
>>>>>>>>>>>>>>>> >     >
>>>>>>>>>>>>>>>> >     > I would like to ask why is there a need to create
>>>>>>>>>>>>>>>> the stale Albums?
>>>>>>>>>>>>>>>> >     >
>>>>>>>>>>>>>>>> >     > Regards
>>>>>>>>>>>>>>>> >     > ᐧ
>>>>>>>>>>>>>>>> >     >
>>>>>>>>>>>>>>>> >     > On Wed, Jun 1, 2016 at 1:19 AM, Marcel Wiesweg
>>>>>>>>>>>>>>>> >     <marcel.wiesweg at gmx.de <mailto:marcel.wiesweg at gmx.de
>>>>>>>>>>>>>>>> >>
>>>>>>>>>>>>>>>> >     >
>>>>>>>>>>>>>>>> >     > wrote:
>>>>>>>>>>>>>>>> >     > > 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)
>>>>>>>>>>>>>>>> >     > >
>>>>>>>>>>>>>>>> >     > > Marcel
>>>>>>>>>>>>>>>> >     > >
>>>>>>>>>>>>>>>> >     > > > 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
>>>>>>>>>>>>>>>> >     > > > > CASCADE ON UPDATE CASCADE)
>>>>>>>>>>>>>>>> >     > > >
>>>>>>>>>>>>>>>> >     > > > 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
>>>>>>>>>>>>>>>> >     > > > ᐧ
>>>>>>>>>>>>>>>> >     > >
>>>>>>>>>>>>>>>> >     > > _______________________________________________
>>>>>>>>>>>>>>>> >     > > Digikam-devel mailing list
>>>>>>>>>>>>>>>> >     > > Digikam-devel at kde.org <mailto:
>>>>>>>>>>>>>>>> Digikam-devel at kde.org>
>>>>>>>>>>>>>>>> >     > >
>>>>>>>>>>>>>>>> https://mail.kde.org/mailman/listinfo/digikam-devel
>>>>>>>>>>>>>>>> >
>>>>>>>>>>>>>>>> >     _______________________________________________
>>>>>>>>>>>>>>>> >     Digikam-devel mailing list
>>>>>>>>>>>>>>>> >     Digikam-devel at kde.org <mailto:Digikam-devel at kde.org>
>>>>>>>>>>>>>>>> >     https://mail.kde.org/mailman/listinfo/digikam-devel
>>>>>>>>>>>>>>>> >
>>>>>>>>>>>>>>>> >
>>>>>>>>>>>>>>>> >
>>>>>>>>>>>>>>>> >
>>>>>>>>>>>>>>>> > _______________________________________________
>>>>>>>>>>>>>>>> > Digikam-devel mailing list
>>>>>>>>>>>>>>>> > Digikam-devel at kde.org
>>>>>>>>>>>>>>>> > https://mail.kde.org/mailman/listinfo/digikam-devel
>>>>>>>>>>>>>>>> >
>>>>>>>>>>>>>>>> _______________________________________________
>>>>>>>>>>>>>>>> Digikam-devel mailing list
>>>>>>>>>>>>>>>> Digikam-devel at kde.org
>>>>>>>>>>>>>>>> https://mail.kde.org/mailman/listinfo/digikam-devel
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>> _______________________________________________
>>>>>>>>>>>> Digikam-devel mailing list
>>>>>>>>>>>> Digikam-devel at kde.org
>>>>>>>>>>>> https://mail.kde.org/mailman/listinfo/digikam-devel
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> _______________________________________________
>>>>>>>>>>> Digikam-devel mailing list
>>>>>>>>>>> Digikam-devel at kde.org
>>>>>>>>>>> https://mail.kde.org/mailman/listinfo/digikam-devel
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> _______________________________________________
>>>>>>>>>> Digikam-devel mailing list
>>>>>>>>>> Digikam-devel at kde.org
>>>>>>>>>> https://mail.kde.org/mailman/listinfo/digikam-devel
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>
>>>>>>>>> _______________________________________________
>>>>>>>>> Digikam-devel mailing list
>>>>>>>>> Digikam-devel at kde.org
>>>>>>>>> https://mail.kde.org/mailman/listinfo/digikam-devel
>>>>>>>>>
>>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> Digikam-devel mailing list
>>>>>>> Digikam-devel at kde.org
>>>>>>> https://mail.kde.org/mailman/listinfo/digikam-devel
>>>>>>>
>>>>>>>
>>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> Digikam-devel mailing list
>>>>> Digikam-devel at kde.org
>>>>> https://mail.kde.org/mailman/listinfo/digikam-devel
>>>>>
>>>>>
>>>>
>>>
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>>>
>>
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>
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