[mapguide-users] RE: About FDO

Thu May 24 13:02:11 EDT 2007

Dave,
One thing to note is that the coordinate system overrides are not working in
Beta 2 for both MySQL ODBC point X,Y geometry or native MySQL spatial.  I
know that at least the ODBC scenario was working fine in Beta 1.  I logged a
ticket with trac late yesterday about this issue:
http://trac.osgeo.org/mapguide/ticket/159

Andy 

-----Original Message-----
From: mapguide-users-bounces at lists.osgeo.org
[mailto:mapguide-users-bounces at lists.osgeo.org] On Behalf Of Dave Wilson
Sent: Thursday, May 24, 2007 9:24 AM
To: MapGuide Users Mail List
Subject: RE: [mapguide-users] RE: About FDO

I think there may be some misunderstanding here. From the sounds of things
it seems to me you are talking about native MySQL spatial data vs FDO
Datastored based data, correct?

Prior to the current beta of open source with overrides it is not possible
to specify a coordinate system for a native MySQL Spatial table. (ie you
load the data using SHP2MySQL or something similar).
There is an SRID column in the MySQL schema, but it is not implemented in
MySQL or currently used by FDO that I am aware of. In other words SRID's
aren't implemented as they are in Oracle.

It should be possible in current MapGuide and in the Beta to create a map
and specify the coordinate system that the data is measured in and the map
should preview. However if the layers are to be used in a map with a
different coordinate system they will not transform unless you have the
override option in the Beta. If you have Map and can create an FDO Datastore
there is a coordinate system defined with the data and this should work
fine.

Another issue with using MySQL that is important to note is that it
currently only supports Envelope based spatial operations. So when a user
attempts to select a polygon in a map there are cases where the adjacent
polygon is selected because MySQL executes an EnvelopeIntersects rather than
an Intersects operation. If you can imagine drawing an envelope rectangle
around to adjacent polygons and note where you clicked to select that if the
rectangles overlap the selection will choose the one with the lowest id.
This is a flaw, but only because MySQL isn't fully spatial capable. The
results are that selection can be somewhat inconsistent on polygon layers.
This may also apply to polylines, but I have yet to determine if this is the
case.

Regards,
Dave

-----Original Message-----
From: mapguide-users-bounces at lists.osgeo.org
[mailto:mapguide-users-bounces at lists.osgeo.org] On Behalf Of Andy Morsell
Sent: Thursday, May 24, 2007 10:02 AM
To: 'MapGuide Users Mail List'
Subject: RE: [mapguide-users] RE: About FDO

To create data, data connections, layers, maps and so on it is easiest to
use one of the GUI's available.  MapGuide Open Source comes with Web Studio.
Or, you can use  the fully featured Autodesk MapGuide Studio.  You can
download and use a preview version from here:
http://usa.autodesk.com/adsk/servlet/index?id=7176611&siteID=123112

Andy 

-----Original Message-----
From: mapguide-users-bounces at lists.osgeo.org
[mailto:mapguide-users-bounces at lists.osgeo.org] On Behalf Of Dhirendra Kumar
Sent: Thursday, May 24, 2007 5:17 AM
To: mapguide-users at lists.osgeo.org
Subject: [mapguide-users] RE: About FDO

Hi Andy Morsell,

Thankyou for your replay, I have succesfully establish mapguide connection
with MySQL 5.0. But i have not idea how to make layer using this connection
and define Cordinate system, So please guide me, how to make layers ? I am
waiting for your valuable replay.

Regards,
Dhirendra Kumar

Andy Morsell wrote:
> 
> What you describe is not really a function of FDO but rather of the 
> MapGuide API.  If you just need to update layer properties and refresh

> the layer and map, then it doesn't matter what your feature source 
> type is.  Any database (that supports your geometry types) will work 
> fine for this type of application.
> 
> 
> Andy Morsell, P.E.
> Spatial Integrators, Inc.
> http://www.SpatialGIS.com
> 
> -----Original Message-----
> From: mapguide-users-bounces at lists.osgeo.org
> [mailto:mapguide-users-bounces at lists.osgeo.org] On Behalf Of Dhirendra 
> Kumar
> Sent: Monday, May 21, 2007 10:45 PM
> To: mapguide-users at lists.osgeo.org
> Subject: [mapguide-users] About FDO
> 
> 
> Hi All,
> 
> I want to use FDO connectivity with MySQL or Oracle. So, first i want
to
> know some information about FDO when i shall use Oracle with FDO then 
> during run time FDO direct Connect Oracle Database ? I am asking this 
> Qustion because my client requirments is to change layers property 
> during run time, Co'uz they want to update Database time to time and 
> as per updation
they
> want to show features on map. Is it possible with FDO ? if yes then
tell
> me
> which database is more sutable with MGOS ? and posible then send me
some
> Examples of FDO Connectvity with some Quieries Example.
> 
> Thankyou in Advance,
> 
> Regards,Dhirendra Kumar
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