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QGIS tries to remove SQL query layers if they return empty #23064
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Author Name: Giovanni Manghi (@gioman)
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Author Name: Jürgen Fischer (@jef-n)
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Author Name: Giovanni Manghi (@gioman) End of life notice: QGIS 2.18 LTR Source: QGIS 3.4 has recently become our new Long Term Release (LTR) version. This is a major step in our history – a long term release version based on the massive updates, library upgrades and improvements that we carried out in the course of the 2.x to 3x upgrade cycle. We strongly encourage all users who are currently using QGIS 2.18 LTR as their preferred QGIS release to migrate to QGIS 3.4. This new LTR version will receive regular bugfixes for at least one year. It also includes hundreds of new functions, usability improvements, bugfixes, and other goodies. See the relevant changelogs for a good sampling of all the new features that have gone into version 3.4 Most plugins have been either migrated or incorporated into the core QGIS code base. We strongly discourage the continued use of QGIS 2.18 LTR as it is now officially unsupported, which means we’ll not provide any bug fix releases for it. You should also note that we intend to close all bug tickets referring to the now obsolete LTR version. Original reporters will receive a notification of the ticket closure and are encouraged to check whether the issue persists in the new LTR, in which case they should reopen the ticket. If you would like to better understand the QGIS release roadmap, check out our roadmap page! It outlines the schedule for upcoming releases and will help you plan your deployment of QGIS into an operational environment. The development of QGIS 3.4 LTR has been made possible by the work of hundreds of volunteers, by the investments of companies, professionals, and administrations, and by continuous donations and financial support from many of you. We sincerely thank you all and encourage you to collaborate and support the project even more, for the long term improvement and sustainability of the QGIS project.
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Author Name: Daniel Moreira (Daniel Moreira)
Original Redmine Issue: 15123
Affected QGIS version: 2.12.3
Redmine category:unknown
I've had this issue where I build an SQL query layer to retrieve data from a database and QGIS opens, if the same query returns empty, QGIS will attempt to removed it as if it was a broken link. This is obviously a problem if you have databases where the return of your queries are not initially empty, but can become over the course of time (such as validation algorithms for errors that return empty when these issues are solved). Is this something that can be addressed?
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