<p></p>
<blockquote>
<p dir="auto">This situation can be easily detected by parsing the string returned by SELECT PostGIS_Full_Version();</p>
</blockquote>
<p dir="auto">I do not recommend parsing the result of 'SELECT PostGIS_Full_Version();' as the text can change at any time, or there could be a localized (non-English) version installed, which would then not work.</p>
<p dir="auto">If the warning is still important, I would rather suggest a comparison based on the PostgreSQL meta tables, although this may yield a different result than the PostGIS_Full_Version();</p>
<div class="highlight highlight-source-sql" dir="auto"><pre class="notranslate"><span class="pl-k">SELECT</span>
  <span class="pl-c1">ae</span>.<span class="pl-c1">name</span>,
  installed_version,
  default_version,
  case when installed_version <span class="pl-k"><></span> default_version 
    THEN <span class="pl-s"><span class="pl-pds">'</span>need_to_upgrade<span class="pl-pds">'</span></span>
    ELSE <span class="pl-s"><span class="pl-pds">'</span>up_to_date<span class="pl-pds">'</span></span>
  END <span class="pl-k">AS</span> upgrade_status
<span class="pl-k">FROM</span> pg_extension e
<span class="pl-k">JOIN</span> pg_available_extensions ae <span class="pl-k">on</span> extname <span class="pl-k">=</span> <span class="pl-c1">ae</span>.<span class="pl-c1">name</span>
<span class="pl-k">WHERE</span> extname<span class="pl-k">=</span><span class="pl-s"><span class="pl-pds">'</span>postgis<span class="pl-pds">'</span></span>
;

  name   | installed_version | default_version | upgrade_status  
<span class="pl-c"><span class="pl-c">--</span>-------+-------------------+-----------------+-----------------</span>
 postgis | <span class="pl-c1">3</span>.<span class="pl-c1">1</span>.<span class="pl-c1">7</span>             | <span class="pl-c1">3</span>.<span class="pl-c1">2</span>.<span class="pl-c1">5</span>           | need_to_upgrade
(<span class="pl-c1">1</span> row)
</pre></div>
<p dir="auto">vs.</p>
<div class="highlight highlight-source-sql" dir="auto"><pre class="notranslate"><span class="pl-k">SELECT</span> PostGIS_Full_Version();

                                           postgis_full_version
<span class="pl-c"><span class="pl-c">--</span>-------------------------------------------------------------------------------------------------</span>
 POSTGIS<span class="pl-k">=</span><span class="pl-s"><span class="pl-pds">"</span>3.1.9 3.1.9<span class="pl-pds">"</span></span> [EXTENSION] PGSQL<span class="pl-k">=</span><span class="pl-s"><span class="pl-pds">"</span>120<span class="pl-pds">"</span></span> (procs need upgrade for use with PostgreSQL <span class="pl-s"><span class="pl-pds">"</span>140<span class="pl-pds">"</span></span>) 
 GEOS<span class="pl-k">=</span><span class="pl-s"><span class="pl-pds">"</span>3.5.0-CAPI-1.9.0 4392<span class="pl-pds">"</span></span> PROJ<span class="pl-k">=</span><span class="pl-s"><span class="pl-pds">"</span>Rel. 6.3.1, February 10th, 2020<span class="pl-pds">"</span></span> LIBXML<span class="pl-k">=</span><span class="pl-s"><span class="pl-pds">"</span>2.9.10<span class="pl-pds">"</span></span> 
 LIBJSON<span class="pl-k">=</span><span class="pl-s"><span class="pl-pds">"</span>0.17<span class="pl-pds">"</span></span> LIBPROTOBUF<span class="pl-k">=</span><span class="pl-s"><span class="pl-pds">"</span>1.4.1<span class="pl-pds">"</span></span> (core procs <span class="pl-k">from</span> <span class="pl-s"><span class="pl-pds">"</span>3.1.7 3.1.7<span class="pl-pds">"</span></span> need upgrade)
 </pre></div>

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