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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Hi Jason,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Thanks for your comments. Your
suggestions for handling 1:many are duly noted, however it is not proposed as
part of this RFC. As Bob mentioned earlier in a previous email, the join
functionality is implemented via a Join component which is also shared with
another commercially available product. Changes were discussed to support
“associations” of a primary feature record to a set of secondary
records, but ultimately did not make it into that product’s release
cycle. I can only speculate that this support may be part of a future
release. As a result, MapGuide will be restricted, for now, to the “lazy
join” result for the 1:many case.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>As for your question on the SDF joins, it
should be possible to join secondary table to a primary table in the same SDF
or different SDF file. I haven’t personally tested this, but if you’ve
got SDFs with multiple tables, you should be able to see a list of all the available
feature classes in the Studio Join UI for which you can use to define you join.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Ronnie<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> Jason Birch
[mailto:Jason.Birch@nanaimo.ca] <br>
<b><span style='font-weight:bold'>Sent:</span></b> Friday, November 03, 2006
4:21 PM<br>
<b><span style='font-weight:bold'>To:</span></b> <st1:PersonName w:st="on">dev@mapguide.osgeo.org</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: [mapguide-dev]
Enhanced Join Support RFC</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<div id=idOWAReplyText15914>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Overall, I like this proposal. I think that the 1:many support is
probably a good first step. It makes it easier to query secondary data
sources and return geometry. <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>However, it is really just a right outer join, and does not provide for
some of the most common map operations that will be required with 1:Many
relationships.<o:p></o:p></span></font></p>
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<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>In particular, it will not be able to support maptips
(display all owners for a parcel), queries (only show properties with more than
one service connection) and theming (color ramp based on number of calls for
service)<o:p></o:p></span></font></p>
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</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>I think that this would be best dealt with in two ways.
First, I would like to see an option to return a single geometry row, with a
nested rowset representing the "Many" records. Second, I would
like to see the option to return a single geometry row along with some basic
aggregate (sum, min, max, mean, group_concat) and search (contains)
results, essentially acting as a GROUP BY operator on the root geometry.
These could even be combined, allowing both the aggregate functions and the
nested results to be returned. <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
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<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>I understand that this is a big request, but I thought I'd reiterate it
here. It was discussed in IRC after the last meeting, but I don't have
the logs.<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
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<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>I also have a question about why spatial and aspatial data sources are
so segregated in Studio. I may just be a bit fuzzy, but is it possible to
join a secondary table in an SDF file to a primary table in the same SDF
file? In another SDF file?<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
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<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Jason<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<div class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>
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<p class=MsoNormal style='margin-bottom:12.0pt'><b><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma;font-weight:bold'>From:</span></font></b><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> Ronnie
Louie<br>
<b><span style='font-weight:bold'>Sent:</span></b> Fri 2006-11-03 2:48 PM<br>
<b><span style='font-weight:bold'>To:</span></b> <st1:PersonName w:st="on">dev@mapguide.osgeo.org</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> [mapguide-dev] Enhanced
Join Support RFC</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Hi All,</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>A first draft of Enhanced Join Support RFC for MGOS is
posted at <a
href="http://wiki.osgeo.org/index.php/MapGuide_RFC_5_-_Enhanced_Join_Support">http://wiki.osgeo.org/index.php/MapGuide_RFC_5_-_Enhanced_Join_Support</a>.</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Please have a look and post your feedback to this group.</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Thanks</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Ronnie Louie</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
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