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Count results of SelectLayerByLocation tool

KarenRobine

I've run a geoprocessing SelectLayerBylocation on 2 layers. One has a few features. The other has millions (the layer to be selected). This runs quickly. But then I'm trying to figure out how many resultant records there are. That seems to hang. I've tried
rtnNum = gp.GetCount_management(freewayLayer)
which is maybe still buggy in 9.3?? (but does it work in 10?)

I've tried a basic search cursor. In 99.99% of my cases, The selection layer will have 0 results. So I think its trying to deal with ALL of the records if the selection layer has 0 features selected.
I've tried gp.tableselect(freewayLayer, tempFile) but this is also rediculously slow. I was thinking this would ONLY work on the selected features but now I'm not so sure.

Ideas? I ONLY need to know how many intersected features there are?

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KarenRobine

I just found this:
http://forums.arcgis.com/threads/16409-Check-if-FeaturLayer-has-Selection-FAIL?p=51277&viewfull=1#post51277

But its soooooo slow. It takes several minutes to execute the following:
intNum = int(gp.GetCount_management(freewayLayer).getoutput(0))

KarenRobine

So the answer is:
fidSet = gp.describe(freewayLayer).fidset
which is sooooo much faster then any other method. (less then a second compared to several minutes using other methods)..
Nice!

ArcGISUser

Here's some existing code you can try:

result = arcpy.GetCount_management(ParcelInfo)
arcpy.AddMessage("   " + result.getOutput(0) + " Anno selected." )
getSTAnnoSel = result.getOutput(0)
if getSTAnnoSel >= 1:
       arcpy.AddMessage("     Anno has been calculated to street anno symbology")
       #Have it do something
elif getSTAnnoSel == 0:   
       arcpy.AddMessage("      Anno is NOT calculated.")
       #Have it do something else

ChrisSnyder

You might want to explicitly be using integer values with this line:

getSTAnnoSel >= "1"

since you are attempting to quantitatively compare two string values (which "sort of" works BTW, but in an alphabetical sort of way). For example:

>>> "3" >= "2"
True
>>> "2" >= "3"
False
>>> "3" > "20"
True
>>> #oh crap!!!

http://forums.arcgis.com/threads/16409-Check-if-FeaturLayer-has-Selection-FAIL?p=51277&viewfull=1#post51277

ArcGISUser

Oops my bad dawg.

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