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<p>If the /vsimem/... file hasn't been created, then it won't be
opened. This is like a regular file system</p>
<p>If you want to copy an existing file to /vsimem/, you can do
something like<br>
</p>
<p>gdal.FileFromMemBuffer("/vsimem/foo.gpkg", open("source.gpkg",
"rb").read())</p>
<p>do something</p>
<p>gdal.Unlink("/vsimem/foo.gpkg")</p>
<p>or you can
ogr.GetDriverByName(...).CreataDataSource("/vsimem/foo") to create
a new one</p>
<p>Even<br>
</p>
<div class="moz-cite-prefix">Le 22/08/2023 à 16:11, Meyer, Jesse R.
(GSFC-618.0)[SCIENCE SYSTEMS AND APPLICATIONS INC] via gdal-dev a
écrit :<br>
</div>
<blockquote type="cite"
cite="mid:9790851A-AB47-4613-AB56-20735490C046@ndc.nasa.gov">
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<p class="MsoNormal">As per your workaround suggestion,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Are these intended to work? The returned
datasource is None. Removing the `/vsimem` preamble returns
the disk-backed geopackage datasource as expected.
<o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:9.0pt;font-family:Menlo;color:#FCFCFA;mso-ligatures:none"><o:p> </o:p></span></p>
<p class="MsoNormal"
style="line-height:13.5pt;background:#2D2A2E"><span
style="font-size:9.0pt;font-family:Menlo;color:#FCFCFA;mso-ligatures:none">tree_canopy_mem_ds
</span><span
style="font-size:9.0pt;font-family:Menlo;color:#FF6188;mso-ligatures:none">=</span><span
style="font-size:9.0pt;font-family:Menlo;color:#FCFCFA;mso-ligatures:none">
ogr</span><span
style="font-size:9.0pt;font-family:Menlo;color:#939293;mso-ligatures:none">.</span><span
style="font-size:9.0pt;font-family:Menlo;color:#A9DC76;mso-ligatures:none">Open</span><span
style="font-size:9.0pt;font-family:Menlo;color:#939293;mso-ligatures:none">('</span><span
style="font-size:9.0pt;font-family:Menlo;color:#FFD866;mso-ligatures:none">/vsimem/Users/jrmeyer3/Downloads/features.gpkg</span><span
style="font-size:9.0pt;font-family:Menlo;color:#939293;mso-ligatures:none">')</span><span
style="font-size:9.0pt;font-family:Menlo;color:#FCFCFA;mso-ligatures:none"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:9.0pt;font-family:Menlo;color:#FCFCFA;mso-ligatures:none"><o:p> </o:p></span></p>
<p class="MsoNormal"
style="line-height:13.5pt;background:#2D2A2E"><span
style="font-size:9.0pt;font-family:Menlo;color:#FCFCFA;mso-ligatures:none">tree_canopy_mem_ds
</span><span
style="font-size:9.0pt;font-family:Menlo;color:#FF6188;mso-ligatures:none">=</span><span
style="font-size:9.0pt;font-family:Menlo;color:#FCFCFA;mso-ligatures:none">
ogr</span><span
style="font-size:9.0pt;font-family:Menlo;color:#939293;mso-ligatures:none">.</span><span
style="font-size:9.0pt;font-family:Menlo;color:#A9DC76;mso-ligatures:none">GetDriverByName</span><span
style="font-size:9.0pt;font-family:Menlo;color:#939293;mso-ligatures:none">("</span><span
style="font-size:9.0pt;font-family:Menlo;color:#FFD866;mso-ligatures:none">GPKG</span><span
style="font-size:9.0pt;font-family:Menlo;color:#939293;mso-ligatures:none">").</span><span
style="font-size:9.0pt;font-family:Menlo;color:#A9DC76;mso-ligatures:none">Open</span><span
style="font-size:9.0pt;font-family:Menlo;color:#939293;mso-ligatures:none">('</span><span
style="font-size:9.0pt;font-family:Menlo;color:#FFD866;mso-ligatures:none">/vsimem/Users/jrmeyer3/Downloads/features.gpkg</span><span
style="font-size:9.0pt;font-family:Menlo;color:#939293;mso-ligatures:none">')</span><span
style="font-size:9.0pt;font-family:Menlo;color:#FCFCFA;mso-ligatures:none"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:9.0pt;font-family:Menlo;color:#FCFCFA;mso-ligatures:none"><o:p> </o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<div style="border:none;border-top:solid #B5C4DF
1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span
style="font-size:12.0pt;color:black">From: </span></b><span
style="font-size:12.0pt;color:black">Even Rouault
<a class="moz-txt-link-rfc2396E" href="mailto:even.rouault@spatialys.com"><even.rouault@spatialys.com></a><br>
<b>Date: </b>Monday, August 21, 2023 at 6:22 PM<br>
<b>To: </b>"Meyer, Jesse R. (GSFC-618.0)[SCIENCE SYSTEMS
AND APPLICATIONS INC]" <a class="moz-txt-link-rfc2396E" href="mailto:jesse.r.meyer@nasa.gov"><jesse.r.meyer@nasa.gov></a>,
<a class="moz-txt-link-rfc2396E" href="mailto:gdal-dev@lists.osgeo.org">"gdal-dev@lists.osgeo.org"</a>
<a class="moz-txt-link-rfc2396E" href="mailto:gdal-dev@lists.osgeo.org"><gdal-dev@lists.osgeo.org></a><br>
<b>Subject: </b>[EXTERNAL] Re: [gdal-dev] Is SQLITE
dialect supported on Memory OGR datasets?</span><span
style="font-size:12.0pt;color:black;mso-ligatures:none"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><br>
<br>
<o:p></o:p></p>
<div>
<p>Jesse,<o:p></o:p></p>
<p>No it wasn't. Fix in <a
href="https://github.com/OSGeo/gdal/pull/8247"
moz-do-not-send="true" class="moz-txt-link-freetext">https://github.com/OSGeo/gdal/pull/8247</a><o:p></o:p></p>
<p>Potential workaround: use a in-memory SQLite or GeoPackage
with a /vsimem/ filename<o:p></o:p></p>
<p>Even<o:p></o:p></p>
<div>
<p class="MsoNormal">Le 21/08/2023 à 21:30, Meyer, Jesse R.
(GSFC-618.0)[SCIENCE SYSTEMS AND APPLICATIONS INC] via
gdal-dev a écrit :<o:p></o:p></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal">Hi,<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">This works:<o:p></o:p></p>
<p class="MsoNormal"
style="line-height:13.5pt;background:#2D2A2E"><span
style="font-size:9.0pt;font-family:Menlo;color:#FCFCFA;mso-ligatures:none">tc_lyr
</span><span
style="font-size:9.0pt;font-family:Menlo;color:#FF6188;mso-ligatures:none">=</span><span
style="font-size:9.0pt;font-family:Menlo;color:#FCFCFA;mso-ligatures:none">
</span><span
style="font-size:9.0pt;font-family:Menlo;color:#A9DC76;mso-ligatures:none">execute_SQL</span><span
style="font-size:9.0pt;font-family:Menlo;color:#939293;mso-ligatures:none">(</span><span
style="font-size:9.0pt;font-family:Menlo;color:#FCFCFA;mso-ligatures:none">tree_canopy_mem_ds</span><span
style="font-size:9.0pt;font-family:Menlo;color:#939293;mso-ligatures:none">,</span><span
style="font-size:9.0pt;font-family:Menlo;color:#FCFCFA;mso-ligatures:none">
</span><span
style="font-size:9.0pt;font-family:Menlo;color:#939293;mso-ligatures:none">"</span><span
style="font-size:9.0pt;font-family:Menlo;color:#FFD866;mso-ligatures:none">select
* from trees</span><span
style="font-size:9.0pt;font-family:Menlo;color:#939293;mso-ligatures:none">",</span><span
style="font-size:9.0pt;font-family:Menlo;color:#FCFCFA;mso-ligatures:none">
</span><i><span
style="font-size:9.0pt;font-family:Menlo;color:#FC9867;mso-ligatures:none">spatialFilter</span></i><span
style="font-size:9.0pt;font-family:Menlo;color:#FF6188;mso-ligatures:none">=</span><span
style="font-size:9.0pt;font-family:Menlo;color:#FCFCFA;mso-ligatures:none">c_geo)</span><o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">However, this:<o:p></o:p></p>
<p class="MsoNormal"
style="line-height:13.5pt;background:#2D2A2E"><span
style="font-size:9.0pt;font-family:Menlo;color:#FCFCFA;mso-ligatures:none">tc_lyr
</span><span
style="font-size:9.0pt;font-family:Menlo;color:#FF6188;mso-ligatures:none">=</span><span
style="font-size:9.0pt;font-family:Menlo;color:#FCFCFA;mso-ligatures:none">
</span><span
style="font-size:9.0pt;font-family:Menlo;color:#A9DC76;mso-ligatures:none">execute_SQL</span><span
style="font-size:9.0pt;font-family:Menlo;color:#939293;mso-ligatures:none">(</span><span
style="font-size:9.0pt;font-family:Menlo;color:#FCFCFA;mso-ligatures:none">tree_canopy_mem_ds</span><span
style="font-size:9.0pt;font-family:Menlo;color:#939293;mso-ligatures:none">,</span><span
style="font-size:9.0pt;font-family:Menlo;color:#FCFCFA;mso-ligatures:none">
</span><span
style="font-size:9.0pt;font-family:Menlo;color:#939293;mso-ligatures:none">"</span><span
style="font-size:9.0pt;font-family:Menlo;color:#FFD866;mso-ligatures:none">select
* from trees</span><span
style="font-size:9.0pt;font-family:Menlo;color:#939293;mso-ligatures:none">",</span><span
style="font-size:9.0pt;font-family:Menlo;color:#FCFCFA;mso-ligatures:none">
</span><i><span
style="font-size:9.0pt;font-family:Menlo;color:#FC9867;mso-ligatures:none">spatialFilter</span></i><span
style="font-size:9.0pt;font-family:Menlo;color:#FF6188;mso-ligatures:none">=</span><span
style="font-size:9.0pt;font-family:Menlo;color:#FCFCFA;mso-ligatures:none">c_geo</span><span
style="font-size:9.0pt;font-family:Menlo;color:#939293;mso-ligatures:none">,</span><span
style="font-size:9.0pt;font-family:Menlo;color:#FCFCFA;mso-ligatures:none">
</span><i><span
style="font-size:9.0pt;font-family:Menlo;color:#FC9867;mso-ligatures:none">dialect</span></i><span
style="font-size:9.0pt;font-family:Menlo;color:#FF6188;mso-ligatures:none">=</span><span
style="font-size:9.0pt;font-family:Menlo;color:#939293;mso-ligatures:none">"</span><span
style="font-size:9.0pt;font-family:Menlo;color:#FFD866;mso-ligatures:none">SQLITE</span><span
style="font-size:9.0pt;font-family:Menlo;color:#939293;mso-ligatures:none">")</span><o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Returns:<o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:9.0pt;font-family:Monaco;color:#FCFCFA;background:#403E41">In
Initialize(): sqlite3_step(SELECT _rowid_, * FROM
'trees' LIMIT 1): SQL logic error</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:9.0pt;font-family:Monaco;color:#FCFCFA;background:#403E41"> </span><o:p></o:p></p>
<p class="MsoNormal">Where execute_SQL =
ogr.DataSource.ExecuteSQL<o:p></o:p></p>
<p class="MsoNormal">Which is naturally a surprise given
that I’m not explicitly asking for the rowid, nor to limit
the number of returned rows.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">The docs claim that the SQLite dialect
can be used with any OGR datasource, so I did expect this
to work. The input datasource is GeoPackage, which is
based on SQLite, so I assume my install is built with
SQLite, though I’d welcome advice on how to explicitly
demonstrate this. <o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">My GDAL version install is 3.6.4, on
OSX 13.5.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
<p class="MsoNormal">Jesse<o:p></o:p></p>
<p class="MsoNormal"><span style="mso-ligatures:none"><br>
<br>
<o:p></o:p></span></p>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>gdal-dev mailing list<o:p></o:p></pre>
<pre><a href="mailto:gdal-dev@lists.osgeo.org" moz-do-not-send="true" class="moz-txt-link-freetext">gdal-dev@lists.osgeo.org</a><o:p></o:p></pre>
<pre><a href="https://lists.osgeo.org/mailman/listinfo/gdal-dev" moz-do-not-send="true" class="moz-txt-link-freetext">https://lists.osgeo.org/mailman/listinfo/gdal-dev</a><o:p></o:p></pre>
</blockquote>
<pre>-- <o:p></o:p></pre>
<pre><a href="http://www.spatialys.com/" moz-do-not-send="true" class="moz-txt-link-freetext">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>
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<pre class="moz-quote-pre" wrap="">_______________________________________________
gdal-dev mailing list
<a class="moz-txt-link-abbreviated" href="mailto:gdal-dev@lists.osgeo.org">gdal-dev@lists.osgeo.org</a>
<a class="moz-txt-link-freetext" href="https://lists.osgeo.org/mailman/listinfo/gdal-dev">https://lists.osgeo.org/mailman/listinfo/gdal-dev</a>
</pre>
</blockquote>
<pre class="moz-signature" cols="72">--
<a class="moz-txt-link-freetext" href="http://www.spatialys.com">http://www.spatialys.com</a>
My software is free, but my time generally not.</pre>
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