[mapguide-users] Sql For Data Filter

[Luiz Marcio Viana]

Ary Sucaya,

I don't know, how is the spatial capability provided by the FDO Provider for PostGIS (I think is the GDAL provider, isn't it?), but you can apply a spatial filter using the geometry of the district layer as a filter to select the parcels.

This is a simple solution wich works almost independently of the provider.

Regards,
Luiz Marcio
  ----- Original Message ----- 
  From: ary sucaya 
  To: MapGuide Users Mail List 
  Sent: Wednesday, January 02, 2008 6:32 AM
  Subject: Re: [mapguide-users] Sql For Data Filter


  Thanks Kenneth,

  I'm looking for sample code of making data filter programmatically and save in into current session.



  Regards,


  Ary Sucaya


  ----- Original Message ----
  From: "Kenneth, GEOGRAF A/S" <ks at geograf.dk>
  To: MapGuide Users Mail List <mapguide-users at lists.osgeo.org>
  Sent: Wednesday, January 2, 2008 10:08:48 AM
  Subject: Re: [mapguide-users] Sql For Data Filter

  I think the "Query" part of the "Generic Tasks" is close to what you want:
  http://data.mapguide.com/mapguide/gt/index.php

  More samples:
  http://mapguide.osgeo.org/livegallery.html

Regards, Kenneth, GEOGRAF A/S


  ary sucaya skrev: 
    Great!, I will try
    I was wondering if there is a sample code for it..
    Thank v much..

    regards,

    Ary Sucaya

     
    ----- Original Message ----
    From: "Kenneth, GEOGRAF A/S" <ks at geograf.dk>
    To: MapGuide Users Mail List <mapguide-users at lists.osgeo.org>
    Sent: Wednesday, January 2, 2008 8:46:05 AM
    Subject: Re: [mapguide-users] Sql For Data Filter

    I don't have a list of what the different providers support.
    I have used the OGR provider, and it supports PostGIS and limited SQL.

    My approach to your problem would be to start out with the layer hidden.
    When you want to display the correct district, you read out the WKT of the feature (district) you want to perform the intersection test with.
    Then you update the filter on the layer to reflect this:
    GeoColumn Intersects GEOMFROMTEXT('....wkt....')
    Then show the layer.

    You should copy the layer into the session repository before altering it.
    If you want to theme it, you can create multiple copies of the layer and apply theming to the individual layers.

Regards, Kenneth, GEOGRAF A/S
  

    ary sucaya skrev: 
      Thank for your reply,

      Can you pls inform me what provider support full sql syntax? I use postgis and it seem to be not support full sql syntax.
      In my case, i can't use join tables because i need spatial relationship between 2 tables. For examples in Mapguide sample there are 11 districts. At first time, i want to hide parcels. Then i want to make a query to show parcels in particular distric and i want maps show parcels which are in that query result. In this case, join between two tables may not help me. I make use spatial relationship such as intersects or within in this case.

      Regards,

      Ary Sucaya

       
      ----- Original Message ----
      From: "Kenneth, GEOGRAF A/S" <ks at geograf.dk>
      To: MapGuide Users Mail List <mapguide-users at lists.osgeo.org>
      Sent: Tuesday, January 1, 2008 5:25:05 PM
      Subject: Re: [mapguide-users] Sql For Data Filter

      That depends on the provider. Some providers supports full SQL syntax.

      I can't see how you can join tables with a filter, as that is the equvalent of the SQL WHERE construct.
      You can try to setup a Join on the featuresource, but I have had limited success with joins.

Regards, Kenneth, GEOGRAF A/S
  

      ary sucaya skrev: 
        Hello,

        I was wondering if i can put a complex sql statement at 'Filter applied to data' textbox on Layer Editor. I need to show some data from my postgis table and sql to select this data involving 2 or more table.


        Regs,

        ary sucaya


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