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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Thanks Regis and Andeas </span><span style="font-size:11.0pt;font-family:Wingdings;color:#1F497D;mso-fareast-language:EN-US">J</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">The big sed on the filesystem could work on .qgs files, but what about .qgz files ?
</span><span lang="EN-US" style="font-size:11.0pt;font-family:Wingdings;color:#1F497D;mso-fareast-language:EN-US">J</span><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Regards<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-top:5.0pt;page-break-after:avoid"><b><span style="font-size:9.0pt;font-family:"Segoe UI",sans-serif;color:#0054A5">Jacky Volpes</span></b><b><span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif;color:#0054A5">
<br>
</span></b><span style="font-size:8.0pt;font-family:"Segoe UI Semilight",sans-serif;color:#595959">Développeur python
<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:5.0pt;page-break-after:avoid"><span style="font-size:8.0pt;font-family:"Segoe UI Semilight",sans-serif;color:#595959">HR-Team pour la Société du Canal de Provence<br>
Direction des Systèmes d’Information<br>
<br>
</span><span style="font-size:9.0pt;font-family:"Segoe UI Semilight",sans-serif;color:#595959">Tél.</span><b><span style="font-size:9.0pt;font-family:"Segoe UI",sans-serif;color:#595959">
</span></b><b><span style="font-size:9.0pt;font-family:"Segoe UI",sans-serif;color:#0054A5">04 42 66 70 34</span></b><span style="font-size:9.0pt;font-family:"Segoe UI Semilight",sans-serif;color:#595959"><br>
Le Tholonet - CS 70064 - 13182 Aix-en-Provence CEDEX 5</span><span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif;color:#7F7F7F"><br>
</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><img width="314" height="96" id="Image_x0020_1" src="cid:image001.jpg@01D6C41D.711C15D0" alt="cid:image001.png@01D34C22.F8A861A0"></span><span style="font-size:8.0pt;font-family:"Segoe UI Semilight",sans-serif;color:#595959"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">De :</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Régis Haubourg [mailto:regis.haubourg@gmail.com]
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<b>Envoyé :</b> jeudi 26 novembre 2020 17:52<br>
<b>À :</b> Andreas Neumann <a.neumann@carto.net><br>
<b>Cc :</b> VOLPES-EXT, Jacky <Jacky.VOLPES-EXT@canal-de-provence.com>; QGIS Developers List <qgis-developer@lists.osgeo.org><br>
<b>Objet :</b> Re: [QGIS-Developer] Modify project before loading<o:p></o:p></span></p>
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<p class="MsoNormal">I can't agree more with Andreas. <o:p></o:p></p>
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<p class="MsoNormal">The best path is to migrate your project pgservicefile. You will have to handle this as a migration , saving before all project files, and applying a script to replace datasource definitions ( a shell or python script can help, but a big
sed on the file system also does the job). <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">As you are on this, I suggest you add some default connection options as you are on it to preserve your database and speed up table listing as suggested here :<o:p></o:p></p>
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<p class="MsoNormal"><img width="517" height="504" id="_x0000_i1025" src="cid:image002.png@01D6C41D.711C15D0" alt="image.png"><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Best regards<o:p></o:p></p>
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<p class="MsoNormal">Régis<o:p></o:p></p>
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<p class="MsoNormal">m/RegisHaubourg/status/<a href="https://pbs.twimg.com/media/Eats5wgWkAA0VdV?format=png&name=900x9001273231305199804417?s=20">https://pbs.twimg.com/media/Eats5wgWkAA0VdV?format=png&name=900x9001273231305199804417?s=20</a><a href="https://twitter.com/RegisHaubourg/status/1273231305199804417?s=2">https://twitter.com/RegisHaubourg/status/1273231305199804417?s=2</a><a href="https://pbs.twimg.com/media/Eats5wgWkAA0VdV?format=png&name=900x900ttps://twitter.com/RegisHaubourg/status/1273231305199804417?s=20">https://pbs.twimg.com/media/Eats5wgWkAA0VdV?format=png&name=900x900ttps://twitter.com/RegisHaubourg/status/1273231305199804417?s=20</a><o:p></o:p></p>
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<p class="MsoNormal">Le jeu. 26 nov. 2020 à 16:20, Andreas Neumann <<a href="mailto:a.neumann@carto.net">a.neumann@carto.net</a>> a écrit :<o:p></o:p></p>
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<p><span style="font-size:10.0pt;font-family:"Verdana",sans-serif">Hi Jacky,<o:p></o:p></span></p>
<p><span style="font-size:10.0pt;font-family:"Verdana",sans-serif">I recommend to use PostgreSQL service names instead of hostname/port/db settings. The projects would connect the layers to a central pg_service.conf file that you can put on a network drive.
On the day the db hostname changes, you can centrally switch the hostname/port/db in just a single text-file.<o:p></o:p></span></p>
<p><span style="font-size:10.0pt;font-family:"Verdana",sans-serif">This also helps to switch between test/integration/production environments by simply pointing to a different pg_service.conf file (see Options --> System --> Environment and user defined variables.
You can use either PGSERVICEFILE or PGSYSCONFDIR).<o:p></o:p></span></p>
<p><span style="font-size:10.0pt;font-family:"Verdana",sans-serif">Seems to me easier and more flexible than what you have in mind with scripting and signals.<o:p></o:p></span></p>
<p><span style="font-size:10.0pt;font-family:"Verdana",sans-serif">Greetings,<o:p></o:p></span></p>
<p><span style="font-size:10.0pt;font-family:"Verdana",sans-serif">Andreas<o:p></o:p></span></p>
<p id="gmail-m_-1030391143535648979reply-intro"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif">On 2020-11-26 16:06, VOLPES-EXT, Jacky wrote:<o:p></o:p></span></p>
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<p><span style="font-size:10.0pt;font-family:"Verdana",sans-serif">Hello QGIS dev team </span><span style="font-size:10.0pt;font-family:Wingdings">J</span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
<p><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"> <o:p></o:p></span></p>
<p><span style="font-size:10.0pt;font-family:"Verdana",sans-serif">I need to modify QGIS project file at reading (loading) time.<o:p></o:p></span></p>
<p><span style="font-size:10.0pt;font-family:"Verdana",sans-serif">The database hostname used in the company is changing soon, and I need this to be transparent for the users.<o:p></o:p></span></p>
<p><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"> <o:p></o:p></span></p>
<p><span style="font-size:10.0pt;font-family:"Verdana",sans-serif">The problem is that all their layers with the old database connections (uri) will trigger a connection error, having the old hostname.<o:p></o:p></span></p>
<p><span style="font-size:10.0pt;font-family:"Verdana",sans-serif">The idea is to update the .qgs file that is being opened with the new hostname with a text-replacement plugin, save the file, and eventually load it in QGIS.<o:p></o:p></span></p>
<p><span style="font-size:10.0pt;font-family:"Verdana",sans-serif">So that the user will not see any difference or error message.<o:p></o:p></span></p>
<p><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"> <o:p></o:p></span></p>
<p><span style="font-size:10.0pt;font-family:"Verdana",sans-serif">Sadly, the QgsProject.readLayer signal is sent after the project has been loaded, hence after the connection error messages…<o:p></o:p></span></p>
<p><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"> <o:p></o:p></span></p>
<p><span style="font-size:10.0pt;font-family:"Verdana",sans-serif">Any suggestion/idea welcome!<o:p></o:p></span></p>
<p><span style="font-size:10.0pt;font-family:"Verdana",sans-serif">Thanks,<o:p></o:p></span></p>
<p><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"> <o:p></o:p></span></p>
<p style="break-after:avoid"><b><span style="font-size:9.0pt;font-family:"Segoe UI",sans-serif;color:#0054A5">Jacky Volpes</span></b><b><span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif;color:#0054A5">
<br>
</span></b><span style="font-size:8.0pt;font-family:"Segoe UI Semilight",sans-serif;color:#595959">Développeur python
</span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p></o:p></span></p>
<p style="break-after:avoid"><span style="font-size:8.0pt;font-family:"Segoe UI Semilight",sans-serif;color:#595959">HR-Team pour la Société du Canal de Provence<br>
Direction des Systèmes d’Information<br>
<br>
</span><span style="font-size:9.0pt;font-family:"Segoe UI Semilight",sans-serif;color:#595959">Tél.</span><span style="font-size:9.0pt;font-family:"Segoe UI",sans-serif;color:#595959">
</span><b><span style="font-size:9.0pt;font-family:"Segoe UI",sans-serif;color:#0054A5">04 42 66 70 34</span></b><span style="font-size:9.0pt;font-family:"Segoe UI Semilight",sans-serif;color:#595959"><br>
Le Tholonet - CS 70064 - 13182 Aix-en-Provence CEDEX 5</span><span style="font-size:10.5pt;font-family:"Segoe UI",sans-serif;color:#7F7F7F"><br>
</span><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><img border="0" width="314" height="96" id="gmail-m_-1030391143535648979v1Image_x0020_1" src="cid:image003.jpg@01D6C41D.711C15D0" alt="cid:image001.png@01D34C22.F8A861A0"><o:p></o:p></span></p>
<p><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
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