Changes between Version 4 and Version 5 of MapGuideRfc46

Timestamp:

Mar 14, 2008, 3:57:46 PM (16 years ago)

Author:

ronnielouie

Comment:

--

MapGuideRfc46

@@ -53 +53 @@
 == Implications ==
 
-Code that currently calls MgSelectionBase::GenerateFilter() should be updated to use MgSelectionBase::GenerateFilters() instead, and the caller will be required to process all the filters in the collection to correctly query the complete selection set.  In places where a relatively small number of features are expected in a selection (i.e. less than the value specified by SelectionFilterSize in serverconfig.ini/webconfig.ini), MgSelectionBase::GenerateFilter() can still be safely used to return correct results.
+Code that currently calls MgSelectionBase::GenerateFilter() should be updated to use MgSelectionBase::GenerateFilters() instead, and the caller will be required to process all the filters in the collection to correctly query the complete selection set.  
+
+PHP code example using existing MgSelectionBase::GenerateFilter() API
+{{{
+            $filter = $sel->GenerateFilter($selLayer, $featureClassName);
+            
+            $query = new MgFeatureQueryOptions();
+            $query->SetFilter($filter);
+ 
+            $featureSource = new MgResourceIdentifier($selLayer->GetFeatureSourceId());
+            $features = $featureSrvc->SelectFeatures($featureSource, $featureClassName, $query);
+            if($features->ReadNext())
+            {
+                do
+                {
+                    AddFeatureToCollection($features->GetGeometry());
+                }
+                while($features->ReadNext());
+                $features->Close();
+            }
+}}}
+
+PHP code example using NEW MgSelectionBase::GenerateFilters() API
+{{{
+            $filterCollection = $sel->GenerateFilters($selLayer, $featureClassName, GetMaxSelectionSize());
+            
+            for ($filterIndex = 0; $filterIndex < $filterCollection->GetCount(), $filterIndex++)
+            {
+                $query = new MgFeatureQueryOptions();
+                $query->SetFilter($filterCollection->GetItem($filterIndex));
+ 
+                $featureSource = new MgResourceIdentifier($selLayer->GetFeatureSourceId());
+                $features = $featureSrvc->SelectFeatures($featureSource, $featureClassName, $query);
+                if($features->ReadNext())
+                {
+                    do
+                    {
+                        AddFeatureToCollection($features->GetGeometry());
+                    }
+                    while($features->ReadNext());
+                    $features->Close();
+                }
+            }
+}}}
+
+In places where a relatively small number of features are expected in a selection (i.e. less than the value specified by SelectionFilterSize in serverconfig.ini/webconfig.ini), MgSelectionBase::GenerateFilter() can still be safely used to return correct results.
 
 This is a new API which will need to be documented.