Add data into ArcMap from geodatabase using Python

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11-13-2015 07:33 PM
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New Contributor III

There must be a way to do Add Data from a .gdb using Python. I looked it up but could not find not one hit.

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Regular Contributor II

To add to the above responses, below is how this would look in the code. The workflow will vary depending on if you're executing the code in-process or out-of-process.

# Option A : When  you're executing code in-process #
import arcpy

# Use this line if you're not sure if it's already true

arcpy.env.addOutputsToMap = True

# Executing tool will automatically add layer to map
arcpy.management.MakeFeatureLayer(r"Path\To\GDB\FeatureClass", "NameForLayer")

# Option B : When you're executing code out-of-process #
import arcpy

# Hook into the map document
mxd = arcpy.mapping.MapDocument(r"Path\To\MapDocument")

# Hook into the data frame where you want to add the layer
df  = arcpy.mapping.ListDataFrames(mxd)[0]

# Create a Layer object
lyr = arcpy.management.MakeFeatureLayer(r"Path\To\GDB\FeatureClass", "NameForLayer").getOutput(0)

# Add the layer object to the map
arcpy.mapping.AddLayer(df, lyr)

Add Layer

http://desktop.arcgis.com/en/desktop/latest/analyze/arcpy-mapping/addlayer.htm

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MVP Esteemed Contributor

The arcpy function and class tree

Makefeaturelayer​ when you are using python with arcmap open and you have  geoprocessing options set to add results to the display toggled on.

Now, that should be a start, but the process you are using will dictate other options.

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MVP Esteemed Contributor

Make Feature Layer—Help | ArcGIS for Desktop  (Dan provided the Pro version)

Creates a feature layer from an input feature class or layer file. The layer that is created by the tool is temporary and will not persist after the session ends unless the layer is saved to disk or the map document is saved.

....

  • Layers created in ArcCatalog cannot be used in ArcMap unless they are saved to a layer file using the Save To Layer File tool.

The help page includes some sample code.

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Regular Contributor II

To add to the above responses, below is how this would look in the code. The workflow will vary depending on if you're executing the code in-process or out-of-process.

# Option A : When  you're executing code in-process #
import arcpy

# Use this line if you're not sure if it's already true

arcpy.env.addOutputsToMap = True

# Executing tool will automatically add layer to map
arcpy.management.MakeFeatureLayer(r"Path\To\GDB\FeatureClass", "NameForLayer")

# Option B : When you're executing code out-of-process #
import arcpy

# Hook into the map document
mxd = arcpy.mapping.MapDocument(r"Path\To\MapDocument")

# Hook into the data frame where you want to add the layer
df  = arcpy.mapping.ListDataFrames(mxd)[0]

# Create a Layer object
lyr = arcpy.management.MakeFeatureLayer(r"Path\To\GDB\FeatureClass", "NameForLayer").getOutput(0)

# Add the layer object to the map
arcpy.mapping.AddLayer(df, lyr)

Add Layer

http://desktop.arcgis.com/en/desktop/latest/analyze/arcpy-mapping/addlayer.htm

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New Contributor III

MakeFeatureLayer is giving an error:

Input Features: Dataset ...\unified.gdb\feature21 does not exist or is not supported

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Regular Contributor II

1. Are you able to navigate to add this feature class manually in ArcMap?

2. If yes, could you show me the full path to the data?

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New Contributor III

Yes, it's in C:\Users\Marcel\Documents\ArcGIS\scratch\unified.gdb\feature21

unified.gdb looks like a folder from the outside, but when I open it, it has all these files with weird extensions (.gdbtable, .gdbindexes, .gdbtblx, etc.). I know, must be one of these two, file database or personal database, just don't know which one.

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Regular Contributor II

What do you get if you run the following command?

arcpy.Exists(r"C:\Users\Marcel\Documents\ArcGIS\scratch\unified.gdb\feature21")

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New Contributor III

Apparently I wasn't using the "r", so it was giving me False at first. I was able to add the data, thanks.