How can Create OVF file (for OGR MYSQL connection) interactively

[Fawcett, David]

Bart, 

I am assuming that this method would be faster than requesting the whole
table from MySQL and then using variable substitution to set an
expression for a class that displays only the record of interest.  

I know that it would be faster to only pass the data that is needed, I
am more curious about whether the OGR/MySQL query mechanism is better or
worse than 'filtering' with a mapfile expression.  

David.

-----Original Message-----
From: UMN MapServer Users List [mailto:MAPSERVER-USERS at LISTS.UMN.EDU] On
Behalf Of Bart van den Eijnden (OSGIS)
Sent: Tuesday, September 19, 2006 2:31 AM
To: MAPSERVER-USERS at LISTS.UMN.EDU
Subject: Re: [UMN_MAPSERVER-USERS] How can Create OVF file (for OGR
MYSQL connection) interactively


See:

http://mapserver.gis.umn.edu/cgi-bin/wiki.pl?VirtualSpatialData

Section: Dynamic Control of Virtual Sources

Best regards,
Bart

>  Dear friends;
>
>  Finally I have solved to read point data form mysql database than 
> draw map by using  those data.
>  I have created Peak Ground Acceleration (PGA) map for the specified
> earthquake which data are
>  stored in MySql. But I would like to display map for all earthquake
which
> are
>  described in the Mysql table as eq-id column.I mean PGA data are
stored
> in mysql database.table for several earthquakes
> and one of the column is called EQ_ID which use for the seperate PGA
data
> from other earthquake like
> EQ_ID            Lon   Lat     PGA
> 200006060242 30.40 32.45 2.5
> 200006060242 30.41 32.46 2.6
> 200006060242 30.42 32.47 2.7
> ...
> 200606071708 38.45 40.98 5.6
> 200606071708 38.46 40.99 5.7
> 200606071708 38.47 41.00 5.7
> 200606071708 38.48 41.01 5.8
> .
> .
> .
>  I have querid mysql database by using ovf file as following
>
>  <OGRVRTDataSource>
>  <OGRVRTLayer name="acceleration">
>
>  
>
<SrcDataSource>MYSQL:database,user=user,password=pass_wd,host=100.00.00.
21,port=3306,tables=d_pgadata1</SrcDataSource>
>  <SrcSQL>SELECT eq_id,latitude,longitude,acceleration from d_pgadata1
>  where eq_id like '%200006060242%' </SrcSQL>
>  <GeometryType>wkbPoint</GeometryType>
>  <GeometryField encoding="PointFromColumns" x="longitude"
y="latitude"/>
>  </OGRVRTLayer>
>  </OGRVRTDataSource>
>
>  As you see when I create map by layer OGR this will just the eq_id 
> like  '%200006060242%'.  But I would like to change this eq_id by 
> interactively for example who will
>  like to see 200606071708 earthquake PGA map he/she can change sql
> statement in
>  ovf file by using php or html commands from web...
>
>  Do you have any idea is it possible or not.
>
>  Please I wellcome any kind of information about it..
>  Thank you
>  Murat
>
>
>
> --
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