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How do I use Python to test whether a FeatureClass has GlobalIDs?

GerryReidel

I have some large SDE databases that we want to start replicating. The feature classes need Global IDs to do this. Some already have them. I want to write a script that will go through every feature class and add a Global IDs, but if a FeatureClass already has one, the script ends. I know I can test a Table for hasGlobalID, but it doesn't work on a FeatureClass. How can I write an IF statement that will test whether a FeatureClass has a GlobalID? Does anyone have a better suggestion?

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forestknutsen1

Thanks Joshua!

bixb0012

There is just a function, or really a property: GDB Table properties—ArcPy Functions | ArcGIS Desktop

Properties
Property Explanation Data Type
globalIDFieldName
(Read Only)
The name of the GlobalID field.
String
hasGlobalID
(Read Only)
Indicates whether the table has a GlobalID field.
Boolean

forestknutsen1

I am wanting to do this as well. Your posted solution does not feel very robust to me because it is based only on the name of the field. I was able to add a GlobalID text field to a fgdb feature class. This would be a false positive in your code. I looked over the field properties for a better solution, but I don't see one. It would be nice to have a function that returns a boolean--something like: hasGlobalID(table/feature class) = True/False.

We want to add global ids to all ersi objects in our database but some have existing global ids.

jskinner

Here is an example on how to do this:

import arcpy
from arcpy import env
env.workspace = r"C:\temp\python\VECTOR.sde"

for fc in arcpy.ListFeatureClasses("*"):
    for field in arcpy.ListFields(fc, "", "GlobalID"):
        if field.name == "GlobalID":
            print fc + " contains GlobalIDs"

for fd in arcpy.ListDatasets("*"):
    for fc in arcpy.ListFeatureClasses("*", "", fd):
        for field in arcpy.ListFields(fc, "", "GlobalID"):
            if field.name == "GlobalID":
                print fc + " contains GlobalIDs"

The above code will search all stand-alone feature classes, and feature classes with feature datasets to see if the GlobalID field exists. You will just need to update 'env.workspace' to your SDE connection file.

RobertHu

ListFields function of ArcPy should return you all fields from a feature class.

http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#/ListFields/000v0000001p000000/

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