Hi there,
I would like to refresh a layer after changing attribute of each feature in the
layer based on an event table. The event table records attribute assigned to
each feature at specified stage. Following is the schema of the event table:
Event(
StageID int, // StageID defines sequence of the event
Feature01 int, // value to be assigned to feature 01
Feature02 int, // value to be assigned to feature 02
...
Feature10 int)
Based on the StageID sequence, values for each feature would be retrieved and
updated to corresponding feature. Finally, update value would be visualized by
unique colortheming. However, it seems the layer refreshing can only be
effective outside the ResultSet loop of the event table.
The following is the program codes:
Inside execute(PlugInContext context)
// get a layer
lyr = context.getLayerManager().getLayer("postgis");
//create a Resultset RS
ResultSet RS stat.executeQuery("select * from Event");
while (RS.next())
{
updatePostgisLayer(lyr, RS);//This function updates feature in the layer
}
< layer refreshes after the looping all the resultset.
My question is how to refresh the layer once attribute values are updated for
each each row of the RecordSet, i.e. immediately after the updatePostgisLayer
function.
If I change the query to retrieve specify row (i.e. single row only), layer can
be refreshed. But it requires to activate it manually for each update.
I tried to add lyr.fireLayerChanged(LayerEventType.APPEARANCE_CHANGED);
or lyr.fireAppearanceChanged() after the updatePostgisLayer function but it
didn't work.
Anyone can help?
thanks,
Elton
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