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Hi Bob,<br>
<br>
I had the problem sometimes that st_union() result was NULL. Perhaps
that's the case with your query, too? Is it necessary to use
st_union()? Otherwise you could replace it with st_collect(), if you
just want to collect all geometries into a multilinestring. That's
more robust because no geoprocessing is needed...<br>
<br>
Regards,<br>
<br>
Birgit<br>
<br>
<br>
<div class="moz-cite-prefix">Am 28.09.2015 um 22:46 schrieb
Bistrais, Bob:<br>
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<p class="MsoNormal">I have been able to derive a geometry from
a query. I want to insert that geometry into a
Multilinestring field. I have some SQL code to do it. When I
run the code, the output say that the query was successful.
But I don’t see the geometry inserted into the table. Here is
the code:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">update highschools_aroo set routegeom = <o:p></o:p></p>
<p class="MsoNormal">(SELECT ST_Union(geom) as mygeom from
(SELECT pt.geom<o:p></o:p></p>
<p class="MsoNormal"> FROM pgr_dijkstra(<o:p></o:p></p>
<p class="MsoNormal"> 'SELECT gid
AS id,<o:p></o:p></p>
<p class="MsoNormal">
sourceroute::integer as source,<o:p></o:p></p>
<p class="MsoNormal">
targetroute::integer as target,<o:p></o:p></p>
<p class="MsoNormal">
(feet / 5280)::double precision AS cost,<o:p></o:p></p>
<p class="MsoNormal">
feet::double precision as reverse_cost<o:p></o:p></p>
<p class="MsoNormal">
FROM ngrdsaroo2',2465,1713,false,true)
<o:p></o:p></p>
<p class="MsoNormal">
as di<o:p></o:p></p>
<p class="MsoNormal">
JOIN ngrdsaroo2 pt on di.id2 = pt.gid) as foo)<o:p></o:p></p>
<p class="MsoNormal">
WHERE source_node = 2465 and target_node = 1713;<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">-As mentioned, this runs with no errors,
but the geometry field is not updated. Any suggestions?<o:p></o:p></p>
<p class="MsoNormal"><br>
Thanks,<o:p></o:p></p>
<p class="MsoNormal">Bob<o:p></o:p></p>
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