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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Oracle provides a way to specify a pk for a view.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-indent:.5in'>alter view <viewname> add
constraint <constraintname> primary key (<columnlist>) disable
novalidate;<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>This pk is not enforced but provides information about what
pk makes sense for the data in the view.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I haven’t tried this with the king oracle provider to
see if it would be recognized.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>It’s hard to guess a possible pk for a view (in an
automated way) unless the view is a simple select from a single table, and the
select includes the underlying table’s pk columns. If there is a join
involved, it’s more complicated.<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>Orest.<o:p></o:p></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";
color:windowtext'>From:</span></b><span style='font-size:10.0pt;font-family:
"Tahoma","sans-serif";color:windowtext'> fdo-internals-bounces@lists.osgeo.org
[mailto:fdo-internals-bounces@lists.osgeo.org] <b>On Behalf Of </b>Kenneth
Skovhede, GEOGRAF A/S<br>
<b>Sent:</b> Tuesday, July 08, 2008 4:29 AM<br>
<b>To:</b> FDO Internals Mail List<br>
<b>Subject:</b> Re: [fdo-internals] primary key on views for rdbms providers?<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I don't think king.oracle works on views without setup in
the helper table.<br>
<br>
If it is possible to detect/guess the PK in any way, that would the<br>
best solution IMO (less user action required).<br>
<br>
The ability to override and otherwise setup the datasource is nice.<br>
You could put it in a config document rather than a special table.<br>
There are pros and cons for both I think.<br>
<br>
<o:p></o:p></p>
<pre>Regards, Kenneth Skovhede, GEOGRAF A/S<o:p></o:p></pre>
<p class=MsoNormal><br>
<br>
Bruno Scott skrev: <o:p></o:p></p>
<pre>Yes it's true,<o:p></o:p></pre><pre>But king.oracle can also work wihout this helper table!<o:p></o:p></pre><pre>Does it support selection on views without the helper table?<o:p></o:p></pre><pre><o:p> </o:p></pre><pre>Do you think adding this king of helper table in the PostGIS provider is a<o:p></o:p></pre><pre>good approach?<o:p></o:p></pre><pre><o:p> </o:p></pre><pre>Bruno<o:p></o:p></pre><pre><o:p> </o:p></pre><pre><o:p> </o:p></pre><pre>Kenneth Skovhede, GEOGRAF A/S wrote:<o:p></o:p></pre><pre> <o:p></o:p></pre>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><pre>The Oracle provider does this with a special helper table:<o:p></o:p></pre><pre><a
href="http://www.sl-king.com/fdooracle/KingFdoClass.htm">http://www.sl-king.com/fdooracle/KingFdoClass.htm</a><o:p></o:p></pre><pre><o:p> </o:p></pre><pre>Regards, Kenneth Skovhede, GEOGRAF A/S<o:p></o:p></pre><pre><o:p> </o:p></pre><pre><o:p> </o:p></pre><pre><o:p> </o:p></pre><pre>Bruno Scott skrev:<o:p></o:p></pre><pre> <o:p></o:p></pre>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><pre>I'm facing a problem in the PostGIS provider when mapping a view to a<o:p></o:p></pre><pre>feature<o:p></o:p></pre><pre>class.<o:p></o:p></pre><pre>How to determine wich column will serves as primary key.<o:p></o:p></pre><pre>Is there a way in PostGIS to know wich one?<o:p></o:p></pre><pre><o:p> </o:p></pre><pre>And on a more general perspective, what if there is more than one primary<o:p></o:p></pre><pre>key in the view's based tables? Is there a rule of thumb we could use?<o:p></o:p></pre><pre><o:p> </o:p></pre><pre>How did you manage to resolve this question in providers like<o:p></o:p></pre><pre>Oracle,MySQL,SqlServer???<o:p></o:p></pre><pre><o:p> </o:p></pre><pre>When there is no primary key on a feature class, the selection in<o:p></o:p></pre><pre>mapguide<o:p></o:p></pre><pre>does not work!<o:p></o:p></pre><pre><o:p> </o:p></pre><pre>Thanks<o:p></o:p></pre><pre>Bruno<o:p></o:p></pre><pre> <o:p></o:p></pre><pre> <o:p></o:p></pre></blockquote>
<pre>_______________________________________________<o:p></o:p></pre><pre>fdo-internals mailing list<o:p></o:p></pre><pre><a
href="mailto:fdo-internals@lists.osgeo.org">fdo-internals@lists.osgeo.org</a><o:p></o:p></pre><pre><a
href="http://lists.osgeo.org/mailman/listinfo/fdo-internals">http://lists.osgeo.org/mailman/listinfo/fdo-internals</a><o:p></o:p></pre><pre><o:p> </o:p></pre><pre><o:p> </o:p></pre><pre> <o:p></o:p></pre></blockquote>
<pre><o:p> </o:p></pre><pre> <o:p></o:p></pre></div>
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