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<p class="MsoNormal"><span style="font-size:11.0pt">Thanks Evan,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Yes, the dataset is open with the update flag set.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">It’s a bit awkward because I want to replace the layer with the layer returned by the query. If I do the naïve “ds.CopyLayer(sql_lyr, layer_name, options=[“OVERWRITE=YES”]) this appears to enter into an infinite
loop. So looks like I need to do this manually.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal">Best,<o:p></o:p></p>
<p class="MsoNormal">Jesse<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Lead Computer Scientist<o:p></o:p></p>
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<p class="MsoNormal">Science Systems and Applications, Inc.<o:p></o:p></p>
<p class="MsoNormal">Dr Compton Tucker Team<o:p></o:p></p>
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<p class="MsoNormal">NASA Goddard Space Flight Center<span style="font-size:11.0pt"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><b><span style="color:black">From:
</span></b><span style="color:black">Even Rouault <even.rouault@spatialys.com><br>
<b>Date: </b>Thursday, January 30, 2025 at 1:47</span><span style="font-family:"Arial",sans-serif;color:black"> </span><span style="color:black">PM<br>
<b>To: </b>Meyer, Jesse R. (GSFC-618.0)[SCIENCE SYSTEMS AND APPLICATIONS INC] <jesse.r.meyer@nasa.gov>, gdal dev <gdal-dev@lists.osgeo.org><br>
<b>Subject: </b>[EXTERNAL] Re: [gdal-dev] ds.DeleteLayer(idx) "failed: database table is locked"<o:p></o:p></span></p>
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<p class="MsoNormal">Jessy, <br>
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<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Trying to remove superfluous intermediate layers in a GPKG dataset. The general logic is<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Ds = ogr.open(fp)<o:p></o:p></p>
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<p>I assume you meant ogr.Open(fp, update=True) otherwise you'd got another type of error.<o:p></o:p></p>
<p><o:p> </o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Lyr = ds.executesql(query)<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Ds.DeleteLayer(idx) <- failed, database table is locked, may be caused by “sqlite3_exec(DROP TABLE “rtree_layername_geom”) failed: database table is locked<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Is layer deletion not supported while a “result set” from a SQL query is on the dataset is active? Perhaps importantly, the query sources the deleted layer.<o:p></o:p></p>
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<p>Yes most likely. Calling ds.ReleaseResultSet(Lyr) before should make things work.<o:p></o:p></p>
<p>You could possibly also try to open the dataset after setting gdal.SetConfigOption("OGR_SQLITE_JOURNAL", "WAL") , but I'm not positive at all this would avoid this particular issue.<o:p></o:p></p>
<p class="MsoNormal">Even <o:p></o:p></p>
<pre>-- <o:p></o:p></pre>
<pre><a href="http://www.spatialys.com/">http://www.spatialys.com</a><o:p></o:p></pre>
<pre>My software is free, but my time generally not.<o:p></o:p></pre>
<pre>Grumpy maintainer.<o:p></o:p></pre>
<pre>"De l'égo à l'égoût, il n'y a qu'une bouche mal refermée", André Isaac<o:p></o:p></pre>
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