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<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">Here is the documentation for the LIKE operator in SQLite:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"><a href="https://www.sqlitetutorial.net/sqlite-like/">https://www.sqlitetutorial.net/sqlite-like/</a><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">It should be possible to use it in a “searched case statement”:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"><a href="https://www.sqlitetutorial.net/sqlite-case/">https://www.sqlitetutorial.net/sqlite-case/</a><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">So the syntax would be:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">db.execute sql="UPDATE myroads SET width=CASE WHEN TYPE LIKE 'M%' THEN 'Wide' WHEN TYPE LIKE 'Loc%' THEN 'Narrow' ELSE 'Unknown' END;"<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">Cheers<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">Stefan<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> grass-user <grass-user-bounces@lists.osgeo.org>
<b>On Behalf Of </b>Margherita Di Leo<br>
<b>Sent:</b> onsdag 17. juni 2020 18:39<br>
<b>To:</b> Micha Silver <tsvibar@gmail.com><br>
<b>Cc:</b> GRASS user list <grass-user@lists.osgeo.org><br>
<b>Subject:</b> Re: [GRASS-user] Reclassify a vector adding a column<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Dear Micha,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Wed, Jun 17, 2020 at 4:05 PM Micha Silver <<a href="mailto:tsvibar@gmail.com">tsvibar@gmail.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On 17/06/2020 16:14, Margherita Di Leo wrote:<o:p></o:p></p>
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<p class="MsoNormal">Ciao Stefan,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">thank you, I tried and it didn't give me any error but didn't update the column either...<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p><o:p> </o:p></p>
<p><o:p> </o:p></p>
<p>The sqlite CASE statement should be:<o:p></o:p></p>
<p>CASE <old_column> WHEN '<old_val1>' THEN '<new_val1>' WHEN '<old_val2>' THEN '<new_val2>'....END;<o:p></o:p></p>
<p><o:p> </o:p></p>
<p>Here's an example that worked for me. I have a "myroads" vector with column 'TYPE'<o:p></o:p></p>
<p><o:p> </o:p></p>
<p><tt><span style="font-size:10.0pt"># Add new column for road width as text</span></tt><o:p></o:p></p>
<p><tt><span style="font-size:10.0pt">v.db.addcolumn myroads column="width TEXT"</span></tt><o:p></o:p></p>
<p><tt><span style="font-size:10.0pt"># Run update with CASE</span></tt><o:p></o:p></p>
<p><tt><span style="font-size:10.0pt">db.execute sql="UPDATE myroads SET width=CASE TYPE WHEN 'Main' THEN 'Wide' WHEN 'Local' THEN 'Narrow' ELSE 'Unknown' END;"</span></tt><o:p></o:p></p>
<p><o:p> </o:p></p>
<p><span style="font-size:13.5pt">Best, Micha</span><o:p></o:p></p>
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<p class="MsoNormal">This worked! Thank you so much! I have one last question. Does it also support an IS LIKE condition, and if yes, how can I express it?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Thanks!<o:p></o:p></p>
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<p class="MsoNormal"><span style="color:#666666">Margherita Di Leo</span><o:p></o:p></p>
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