Bug report #8908
spatialite database updated only from opening qgis project
|Affected QGIS version:||2.0.1||Regression?:||No|
|Operating System:||ubuntu / win||Easy fix?:||No|
|Pull Request or Patch supplied:||No||Resolution:||end of life|
|Crashes QGIS or corrupts data:||No||Copied to github as #:||17584|
If I load a spatialite spatial view into QGIS (2.x) with no data in it, then the spatialite database gets updated only from adding that layer.
The same thing happens each time I open a qgis project with an empty spatialite spatial view.
I guess this has to do with the layer statistics being updated (the extents for the spatial view I think).
This is a problem when using splite databases for offline work: Whenever a qgis project is opened, that includes an empty spatial view, then the database is updated - this triggers erroneous synchronisations when online again.
Marked as blocker since it is a regression from 1.8.
#2 Updated by aperi2007 - over 6 years ago
I guess to better understand the question and why it do this is preferrable to link the discussion on spatialite ML about it and the Furieri response.
#3 Updated by Josef Källgården over 6 years ago
As Furieri explains in the discussion on spatalite ML it is the optimistic approach (GAIA_VECTORS_LIST_OPTIMISTIC) of the qgs data provider that makes a spatialite db not being updated when a spatialite view is added to qgis. But as explained in the description above, whenever a spatialite view is empty, the db gets updated. I think this is an inconsistent behaviour.
Even though I would prefer that the db were not updated unless actual changes were made (easier when synching after offline use), I would very much prefer the behaviour to be consistent no matter if the view is empty or not. I can think of a few alternatives, but there are probably others:
a. stay with optimistic approach and fix a consistent behaviour by introducing some clever code in data provider to never update db unless time stamps say underlaying tables are updated
b. change to pessimistic approach
c. do nothing and stay with this inconsistency (I hope not)
#7 Updated by Josef Källgården over 2 years ago
- Status changed from Feedback to Open
Giovanni Manghi wrote:
Please test with a recent QGIS release (2.18 or 3), if the issue/request is still valid change the affected version accordingly, if is fixed/implemented then close the ticket. Thanks!
Confirmed this issue still exists for qgis version 2.18.16 (For some reason I can not change affected version in the original bug report above.)
#8 Updated by Giovanni Manghi over 1 year ago
- Resolution set to end of life
- Status changed from Open to Closed
End of life notice: QGIS 2.18 LTR
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