Hi,
> One more thing to think about: user selects all the parcels belonging to a 
> farm with ID=1234 and makes a query layer as "SELECT * from parcels WHERE 
> FARM_ID=1234".  However, in real life it is very unsafe to edit geometries in 
> this state (editing attributes is ok) because selected parcels can have 
> neighbours from another farms. Good way to edit is to zoom into one parcel 
> and and make a new query (BBOX or Intersects the selected parcel, or perhaps 
> best, DWithin 100 m from selected parcel). Otherwise users will make overlaps 
> or create gaps between the parcels and ruin the topological quality of the 
> data.
Yes, generally speaking editing a PosGIS table from OpenJUMP is very unsafe.
However, I think in the example you give, it's up to the user to take 
care of his
data as we cannot know if he is editing a whole dataset, or a partial 
dataset.
> Challange: How to handle query layers if user needs to add new features with 
> the neighbouring parcel search? These additions will also give dublicates as 
> some parcels have already fetched from the database. Dublicates could be 
> filtered out by IDs but it is also possible that user has edited some parcel 
> but it is not saved yet and search for neighbours will give a parcel with the 
> same ID but old geometry or attributes. It means that the system for 
> eliminating dublicates should be designed so that it removes the correct 
> dublicates.
Did not understand fully this use case. What do you mean with
"user needs to add new features with the neighbouring parcel search"
Why should it duplicate parcels ?
> Editing layers which do not fit totally into OJ memory is not simple but it 
> would be very good to make is work because such big datasets are not at all 
> uncommon.
Yes, it would be very interesting, and there still is much work to do ;-)

Michaël
>
> -Jukka-
>
>
> ________________________________________
> Lähettäjä: Michaël Michaud [michael.mich...@free.fr]
> Lähetetty: 18. marraskuuta 2012 23:05
> Vastaanottaja: jump-pilot-devel@lists.sourceforge.net
> Aihe: Re: [JPP-Devel] Can not read PostGIS projects
>
> Hi
>> 1 - try to link the postgis writer to query-on-demand rather than
>> dynamic query
>> With query-on-demand, there is now the possibility to synchronise the
>> view with
>> the database on user-demand (RefreshDataStoreQueryPlugIn)
> Made some progress with this idea. This is not as user friendly as it
> could be, but
> it is now possible to read/write postgis table from the same datasource.
>
> When a layer is saved in a table, OpenJUMP creates a
> DataStoreQueryDataSource
> on this layer (query on demand) with the following query :
> "select * from table limit 100000"
>
> This way, the layer will be saved in the project with this query, and it
> is possible
> to update the table from the database (refresh) or to update the
> database from
> the layer (save as).
>
> I uploaded a small video to show how PostGIS writer and Datastore table
> work
> together :
> http://geo.michaelm.free.fr/OpenJUMP/resources/video/
>
> Next on the list is the identifier stuff (how to create a unique
> identifier in the
> database and use it for updates.
>
> Michaël
>> 2 - make editing more dynamic so that each user action
>> (creation/modification/deletion) is immediately and automatically
>> commited in the database 3 - create a more transactional mechanism
>> where edit can be saved in the context of a dynamic layer and
>> committed on demand I think the first one is the only one I'll be able
>> to work on before a final 1.6 release. Second and third one need
>> probably much work. I think kosmo use a transactionnal model. Would be
>> useful to study how they manage that. Thanks for your always valuable
>> inputs. Michaël -Jukka- Michaël
>>>> -Jukka Rahkonen-
>>>> ________________________________________
>>>> Lähettäjä: Stefan Steiniger [sst...@geo.uzh.ch]
>>>> Lähetetty: 17. marraskuuta 2012 21:11
>>>> Vastaanottaja: OpenJump develop and use
>>>> Aihe: Re: [JPP-Devel] Can not read PostGIS projects
>>>>
>>>> Hi Michael,
>>>>
>>>> sounds reasonable to me. But we would need to add a comment on that...
>>>> When the project is saved, it would mean to send a message to the user
>>>> at save time?
>>>>
>>>> thanks for working on this - on the weekend!
>>>> stefan
>>>>
>>>> Am 17.11.12 15:17, schrieb Michaël Michaud:
>>>>> Hi Uwe, others,
>>>>>
>>>>> I'd like to have PostGIS users feedback about the following question :
>>>>> Save as PostGIS table can save a layer as a new PostGIS table
>>>>> or update an existing PostGIS table with different options.
>>>>>
>>>>> IMHO, only the first option (create new table) should set the postgis
>>>>> table as the new Datasource for the layer (and save it in the project).
>>>>>
>>>>> In other cases, the layer may contain only a few features and
>>>>> the table we connect to maybe a huge table. Setting this huge table
>>>>> as the new datasource may freeze the application.
>>>>>
>>>>> Any comment ?
>>>>>
>>>>> Michaël
>>>>>
>>>>>> Uwe, Landon,
>>>>>>
>>>>>> I had forgotten Uwe's mail, but I now have added a bug report
>>>>>> and will tackle it before 1.6 final release.
>>>>>>
>>>>>> Michaël
>>>>>>> Hi Landon,
>>>>>>>
>>>>>>> no, I got no response.
>>>>>>>
>>>>>>> I tested it now again with the latest nightbuild
>>>>>>> (Version 20121111 snapshot rev.3073), but I have the
>>>>>>> same problem.
>>>>>>>
>>>>>>> Regards
>>>>>>>
>>>>>>> Uwe
>>>>>>>
>>>>>>> Am 12.11.2012 17:26, schrieb Landon Blake:
>>>>>>>> Uwe:
>>>>>>>>
>>>>>>>> Did you ever get a response or a solution to this problem?
>>>>>>>>
>>>>>>>> Landon
>>>>>>>>
>>>>>>>> On Mon, Sep 24, 2012 at 12:00 AM, Uwe Dalluege
>>>>>>>> <uwe.dallu...@hcu-hamburg.de> wrote:
>>>>>>>>> Hi,
>>>>>>>>>
>>>>>>>>> I can not read projects with PostGIS layer.
>>>>>>>>> OJ Version 20120924 snapshot rev.3004
>>>>>>>>> OS: W7 (64 bit) and XP (32 bit).
>>>>>>>>>
>>>>>>>>> 1. Add A New Layer.
>>>>>>>>> 2. Draw a geometry.
>>>>>>>>> 3. Save the layer to PostGIS with Save Dataset As.
>>>>>>>>> 4. Save Project As...
>>>>>>>>>
>>>>>>>>> 5. When I open the project again the project is empty
>>>>>>>>> and the category System is deleted.
>>>>>>>>>
>>>>>>>>> Regards
>>>>>>>>>
>>>>>>>>> Uwe
>>>>>>>>>
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