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<p class=MsoNormal><span style='color:#1F497D'>If that wrapper would return
same data buffer than we are into same problems as if we would send
reader to another command.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Feature reader data buffer would
be corrupted on next call and that wrapper in another command would give wrong
result.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>When I was talking about feature
reader returning fdo data value, was primarily to avoid what we do now: switch(data
type), we create new fdo data type , copy raw data to new fdo data value and
pass that data to another command.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Intention was to reduce that
switch and data copy code in every fdo application.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>I think to improve performance
of reader, would be that reader will be able to fetch data in preallocated shared
data buffers.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Haris<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> fdo-internals-bounces@lists.osgeo.org
[mailto:fdo-internals-bounces@lists.osgeo.org] <b>On Behalf Of </b>Traian
Stanev<br>
<b>Sent:</b> Monday, November 24, 2008 10:15 PM<br>
<b>To:</b> FDO Internals Mail List<br>
<b>Subject:</b> RE: [fdo-internals] New RFC 30 Posted<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Yes, a wrapper around either
FdoFeatureReader or a PropertyValueCollection – same API for both.
However, it would not necessarily copy the data from the FeatureReader –
in the case where it wraps a FeatureReader it could simply do a passthrough,
for example:<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>virtual FdoString*
FdoFRFeature::GetString(FdoString* propName) { return m_reader->GetString(propName);
}<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Where m_reader is a private
member variable pointing to the FeatureReader. <o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>In the case where it wraps a
PropertyValueCollection, it would be *<b>roughly</b>*:<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>virtual FdoString*
FdoPVCFeature::GetString(FdoString* propName) { return
((FdoStringValue*)m_propValCol->FindItem(propName))->GetString(); }<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>The actual implementation is not
the point though, as long as the outfacing API allows for implementing it
efficiently. I don’t think an API which uses PropertyValue objects has
the maximum potential for efficiency because you would be incurring at least
two virtual calls to refcounting functions on top of already expensive virtual
calls to get the value.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Traian<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='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"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
fdo-internals-bounces@lists.osgeo.org [mailto:fdo-internals-bounces@lists.osgeo.org]
<b>On Behalf Of </b>Haris Kurtagic<br>
<b>Sent:</b> Monday, November 24, 2008 4:19 PM<br>
<b>To:</b> FDO Internals Mail List<br>
<b>Subject:</b> RE: [fdo-internals] New RFC 30 Posted<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='color:#1F497D'>I guess there is lot of discus
on that topic.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>You are proposing an wrapper
over feature reader which would expose data of reader ?<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Than that wrapper would need to
read rows (or one row ) from reader and copy data to new data buffer before it
can be used in another command?<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>If it would fetch data to new
data buffers than it is same performance problem of copying data. Same
performance as to copy data to property values as we do already eventually if
we want to do something else with that data.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Data type conversions can be
implemented on existing reader too.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>What I see as way to improve performance
is to be able to set data buffers for select command so returned reader would
used those buffers. So this same data without copying can be reused.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Haris<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
fdo-internals-bounces@lists.osgeo.org
[mailto:fdo-internals-bounces@lists.osgeo.org] <b>On Behalf Of </b>Traian
Stanev<br>
<b>Sent:</b> Monday, November 24, 2008 9:34 PM<br>
<b>To:</b> FDO Internals Mail List<br>
<b>Subject:</b> RE: [fdo-internals] New RFC 30 Posted<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Think of it as a data row
– a feature reader lets you iterate through many such data rows via
ReadNext(). It is also very similar to OGRFeature for example (<a
href="http://www.gdal.org/ogr/classOGRFeature.html">http://www.gdal.org/ogr/classOGRFeature.html</a>).<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>So, for example say you want to
transfer a feature from one connection to another – you would do a select
from one connection, and that will return a FeatureReader. You can wrap that in
the data row object, which has essentially the same API as the feature reader,
except that it does not allow ReadNext(). Then you can pass that wrapper to an
FdoInsert which will take the data row and insert it into the destination
connection.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Internally you could also wrap a
PropertyValue collection in such a data row object – no matter whether it
is backed by a FeatureReader or a PropertyValue collection, it would offer the
same API. Also, you can have the data row convert all its data into a
PropertyValueCollection which you can use in case you don’t need
performance, thus enabling interop with existing code, which uses such
PropertyValue collections.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>You can also for example define
this object so that it can do automatic type conversion for you – say you
call GetInt32 on an Int16 property – it can automatically do the cast for
you. Which would provide equivalent functionality to RFC 30 by the way, or it
can use whatever code RFC30 adds to FDO. </span><span style='font-family:Wingdings;
color:#1F497D'>J</span><span style='color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Traian<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='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"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
fdo-internals-bounces@lists.osgeo.org
[mailto:fdo-internals-bounces@lists.osgeo.org] <b>On Behalf Of </b>Haris
Kurtagic<br>
<b>Sent:</b> Monday, November 24, 2008 3:36 PM<br>
<b>To:</b> FDO Internals Mail List<br>
<b>Subject:</b> RE: [fdo-internals] New RFC 30 Posted<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='color:#1F497D'>I am affraid I don’t
understand now. That equivalent of reader would be returned by command (than it
is new reader) or it would be created from returned current Reader ?<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Haris<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
fdo-internals-bounces@lists.osgeo.org
[mailto:fdo-internals-bounces@lists.osgeo.org] <b>On Behalf Of </b>Traian
Stanev<br>
<b>Sent:</b> Monday, November 24, 2008 9:01 PM<br>
<b>To:</b> FDO Internals Mail List<br>
<b>Subject:</b> RE: [fdo-internals] New RFC 30 Posted<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Yes that’s a problem and
that’s why I said “FdoFeatureReader (or equivalent)”. What I
meant by “equivalent” was something that has the almost the same
API as FdoIFeatureReader, without the ReadNext/Close functions. Essentially it
would represent a single row of data, with an API that allows fast access in a
way that is the same as reading features coming from a query.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Traian<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'> <o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
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<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
fdo-internals-bounces@lists.osgeo.org
[mailto:fdo-internals-bounces@lists.osgeo.org] <b>On Behalf Of </b>Haris
Kurtagic<br>
<b>Sent:</b> Monday, November 24, 2008 3:21 PM<br>
<b>To:</b> FDO Internals Mail List<br>
<b>Subject:</b> RE: [fdo-internals] New RFC 30 Posted<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='color:#1F497D'>Yes I understood that. I am
afraid that it can be dangerous to use readers as input to another command.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>One of thing would be that
reader would not be closed before another command would be executed.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Not necessarily but I am worried
that it could create problems with current readers/commands.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>If we look further as you
suggested to improve performance of readers, than it would be better to have
them to returned shared pointers to data or to be able to set data buffers to
be used by readers.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>But even before that I would
prefer to have index access to columns of readers as we speak of performance,
we discussed it few times :)<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Haris<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
fdo-internals-bounces@lists.osgeo.org [mailto:fdo-internals-bounces@lists.osgeo.org]
<b>On Behalf Of </b>Traian Stanev<br>
<b>Sent:</b> Monday, November 24, 2008 8:41 PM<br>
<b>To:</b> FDO Internals Mail List<br>
<b>Subject:</b> RE: [fdo-internals] New RFC 30 Posted<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Yes, but creating PropertyValues
would be a performance overhead. That’s why I’m suggesting the
alternative approach of allowing commands to pull the feature’s data
directly from a FeatureReader (or equivalent).<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><span style='color:#1F497D'>Traian<o:p></o:p></span></p>
<p class=MsoNormal><span style='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"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
fdo-internals-bounces@lists.osgeo.org
[mailto:fdo-internals-bounces@lists.osgeo.org] <b>On Behalf Of </b>Haris
Kurtagic<br>
<b>Sent:</b> Monday, November 24, 2008 2:25 PM<br>
<b>To:</b> FDO Internals Mail List<br>
<b>Subject:</b> RE: [fdo-internals] New RFC 30 Posted<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Right now from Reader we
can’t get PropertyValues only raw data.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>To get Property value and property
value collection which then could be passed to another command would be of
great help and remove some of unnecessary data conversions.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Haris<o:p></o:p></span></p>
<p class=MsoNormal><span style='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"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
fdo-internals-bounces@lists.osgeo.org
[mailto:fdo-internals-bounces@lists.osgeo.org] <b>On Behalf Of </b>Traian
Stanev<br>
<b>Sent:</b> Monday, November 24, 2008 7:39 PM<br>
<b>To:</b> FDO Internals Mail List<br>
<b>Subject:</b> RE: [fdo-internals] New RFC 30 Posted<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>An alternative to this
suggestion is to make the destination command accept an FdoIFeatureReader (or
something equivalent that provides access to property values in a procedural
way) as argument, rather than a collection of PropertyValues. I was thinking of
this when I was implementing the SDF->SQLite converter, which requires two
translations from PropertyValue to raw data – once when initializing the
inputs of the insert command and a second time inside the destination provider
when matching the input property values to the destination schema.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Traian<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='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"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
fdo-internals-bounces@lists.osgeo.org [mailto:fdo-internals-bounces@lists.osgeo.org]
<b>On Behalf Of </b>Haris Kurtagic<br>
<b>Sent:</b> Monday, November 24, 2008 8:27 AM<br>
<b>To:</b> FDO Internals Mail List<br>
<b>Subject:</b> RE: [fdo-internals] New RFC 30 Posted<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='color:#1F497D'>Hi Brent,<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>not directly related to this RFC
but still it is important issue regarding FDO data values.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>I find a problem working with
FDO Readers and commands is that I need to get value as basic type from reader
and then convert to FdoDataValue etc...<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>I would like to be able to use
data values and properties with values from readers directly and make those as
input value for another FDO command.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Right now I need to check data
type returned from property get that data as native convert back to fdo data
value and put as input to FDO command.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Haris<o:p></o:p></span></p>
<p class=MsoNormal><span style='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"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
fdo-internals-bounces@lists.osgeo.org
[mailto:fdo-internals-bounces@lists.osgeo.org] <b>On Behalf Of </b>Brent
Robinson<br>
<b>Sent:</b> Friday, November 21, 2008 7:32 PM<br>
<b>To:</b> FDO Internals Mail List<br>
<b>Subject:</b> [fdo-internals] New RFC 30 Posted<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Hi,<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>RFC 30 (<a href="http://trac.osgeo.org/fdo/wiki/FDORfc30">http://trac.osgeo.org/fdo/wiki/FDORfc30</a>)
is now ready for review. The main purpose is add FDO API functions to
encapsulate conversions between different FDO data types. Please review and let
me know if you have any questions or comments.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>If approved, this one will likely be implemented 2 versions
after FDO 3.3. <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>Brent.<o:p></o:p></p>
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