Selecting all values with by using SelectLayerByAttribute_management with input Parameter












2















I am trying to select all values with Null by using the SelectLayerByAttribute_management. But the Fieldname in the where-clause is alterable by using the input-parameter.



That is what i tried:



if inputValue == "Null":
ap.SelectLayerByAttribute_management(inputFeature,"NEW_SELECTION", inputFieldname +"IS NULL")


Does somebody have an idea what I did wrong?
That's the error message i get:
ExecuteError: ERROR 000358: Invalid expression
Failed to execute (SelectLayerByAttribute).










share|improve this question





























    2















    I am trying to select all values with Null by using the SelectLayerByAttribute_management. But the Fieldname in the where-clause is alterable by using the input-parameter.



    That is what i tried:



    if inputValue == "Null":
    ap.SelectLayerByAttribute_management(inputFeature,"NEW_SELECTION", inputFieldname +"IS NULL")


    Does somebody have an idea what I did wrong?
    That's the error message i get:
    ExecuteError: ERROR 000358: Invalid expression
    Failed to execute (SelectLayerByAttribute).










    share|improve this question



























      2












      2








      2








      I am trying to select all values with Null by using the SelectLayerByAttribute_management. But the Fieldname in the where-clause is alterable by using the input-parameter.



      That is what i tried:



      if inputValue == "Null":
      ap.SelectLayerByAttribute_management(inputFeature,"NEW_SELECTION", inputFieldname +"IS NULL")


      Does somebody have an idea what I did wrong?
      That's the error message i get:
      ExecuteError: ERROR 000358: Invalid expression
      Failed to execute (SelectLayerByAttribute).










      share|improve this question
















      I am trying to select all values with Null by using the SelectLayerByAttribute_management. But the Fieldname in the where-clause is alterable by using the input-parameter.



      That is what i tried:



      if inputValue == "Null":
      ap.SelectLayerByAttribute_management(inputFeature,"NEW_SELECTION", inputFieldname +"IS NULL")


      Does somebody have an idea what I did wrong?
      That's the error message i get:
      ExecuteError: ERROR 000358: Invalid expression
      Failed to execute (SelectLayerByAttribute).







      arcpy select-by-attribute parameters null error-000358






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited 1 hour ago









      PolyGeo

      53.3k1779238




      53.3k1779238










      asked 1 hour ago









      AndreasAndreas

      183




      183






















          2 Answers
          2






          active

          oldest

          votes


















          2














          Use three quotes, AddFieldDelimiters and format:



          sql = """{0} IS NULL""".format(arcpy.AddFieldDelimiters(datasource=inputFeature, field=inputFieldname))
          ap.SelectLayerByAttribute_management(inputFeature,"NEW_SELECTION", sql)





          share|improve this answer



















          • 1





            Thank you! Works perfect!

            – Andreas
            1 hour ago











          • @Andreas Nice! Please accept my answer with the checkbox

            – BERA
            1 hour ago



















          0














          I think this should work:



          sql = "{0} IS NULL".format(inputFieldname)
          arcpy.SelectLayerByAttribute_management(inputFeature,"NEW_SELECTION", sql)





          share|improve this answer
























          • I dont think it will with shape or fgdb input since they will need double quotes around the field name. Unless inputFieldname = '"somefield"'

            – BERA
            52 mins ago








          • 1





            @BERA My understanding is that ArcGIS has been very forgiving on field delimiters for the last 3-4 dot releases. I cannot remember the last time that I used them in an SQL expression like this with either a file geodatabase or a shapefile.

            – PolyGeo
            45 mins ago






          • 1





            I Think you are correct. I just tried it and it does work without field delimiters.

            – BERA
            40 mins ago











          Your Answer








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          2 Answers
          2






          active

          oldest

          votes








          2 Answers
          2






          active

          oldest

          votes









          active

          oldest

          votes






          active

          oldest

          votes









          2














          Use three quotes, AddFieldDelimiters and format:



          sql = """{0} IS NULL""".format(arcpy.AddFieldDelimiters(datasource=inputFeature, field=inputFieldname))
          ap.SelectLayerByAttribute_management(inputFeature,"NEW_SELECTION", sql)





          share|improve this answer



















          • 1





            Thank you! Works perfect!

            – Andreas
            1 hour ago











          • @Andreas Nice! Please accept my answer with the checkbox

            – BERA
            1 hour ago
















          2














          Use three quotes, AddFieldDelimiters and format:



          sql = """{0} IS NULL""".format(arcpy.AddFieldDelimiters(datasource=inputFeature, field=inputFieldname))
          ap.SelectLayerByAttribute_management(inputFeature,"NEW_SELECTION", sql)





          share|improve this answer



















          • 1





            Thank you! Works perfect!

            – Andreas
            1 hour ago











          • @Andreas Nice! Please accept my answer with the checkbox

            – BERA
            1 hour ago














          2












          2








          2







          Use three quotes, AddFieldDelimiters and format:



          sql = """{0} IS NULL""".format(arcpy.AddFieldDelimiters(datasource=inputFeature, field=inputFieldname))
          ap.SelectLayerByAttribute_management(inputFeature,"NEW_SELECTION", sql)





          share|improve this answer













          Use three quotes, AddFieldDelimiters and format:



          sql = """{0} IS NULL""".format(arcpy.AddFieldDelimiters(datasource=inputFeature, field=inputFieldname))
          ap.SelectLayerByAttribute_management(inputFeature,"NEW_SELECTION", sql)






          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered 1 hour ago









          BERABERA

          15.1k52042




          15.1k52042








          • 1





            Thank you! Works perfect!

            – Andreas
            1 hour ago











          • @Andreas Nice! Please accept my answer with the checkbox

            – BERA
            1 hour ago














          • 1





            Thank you! Works perfect!

            – Andreas
            1 hour ago











          • @Andreas Nice! Please accept my answer with the checkbox

            – BERA
            1 hour ago








          1




          1





          Thank you! Works perfect!

          – Andreas
          1 hour ago





          Thank you! Works perfect!

          – Andreas
          1 hour ago













          @Andreas Nice! Please accept my answer with the checkbox

          – BERA
          1 hour ago





          @Andreas Nice! Please accept my answer with the checkbox

          – BERA
          1 hour ago













          0














          I think this should work:



          sql = "{0} IS NULL".format(inputFieldname)
          arcpy.SelectLayerByAttribute_management(inputFeature,"NEW_SELECTION", sql)





          share|improve this answer
























          • I dont think it will with shape or fgdb input since they will need double quotes around the field name. Unless inputFieldname = '"somefield"'

            – BERA
            52 mins ago








          • 1





            @BERA My understanding is that ArcGIS has been very forgiving on field delimiters for the last 3-4 dot releases. I cannot remember the last time that I used them in an SQL expression like this with either a file geodatabase or a shapefile.

            – PolyGeo
            45 mins ago






          • 1





            I Think you are correct. I just tried it and it does work without field delimiters.

            – BERA
            40 mins ago
















          0














          I think this should work:



          sql = "{0} IS NULL".format(inputFieldname)
          arcpy.SelectLayerByAttribute_management(inputFeature,"NEW_SELECTION", sql)





          share|improve this answer
























          • I dont think it will with shape or fgdb input since they will need double quotes around the field name. Unless inputFieldname = '"somefield"'

            – BERA
            52 mins ago








          • 1





            @BERA My understanding is that ArcGIS has been very forgiving on field delimiters for the last 3-4 dot releases. I cannot remember the last time that I used them in an SQL expression like this with either a file geodatabase or a shapefile.

            – PolyGeo
            45 mins ago






          • 1





            I Think you are correct. I just tried it and it does work without field delimiters.

            – BERA
            40 mins ago














          0












          0








          0







          I think this should work:



          sql = "{0} IS NULL".format(inputFieldname)
          arcpy.SelectLayerByAttribute_management(inputFeature,"NEW_SELECTION", sql)





          share|improve this answer













          I think this should work:



          sql = "{0} IS NULL".format(inputFieldname)
          arcpy.SelectLayerByAttribute_management(inputFeature,"NEW_SELECTION", sql)






          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered 58 mins ago









          PolyGeoPolyGeo

          53.3k1779238




          53.3k1779238













          • I dont think it will with shape or fgdb input since they will need double quotes around the field name. Unless inputFieldname = '"somefield"'

            – BERA
            52 mins ago








          • 1





            @BERA My understanding is that ArcGIS has been very forgiving on field delimiters for the last 3-4 dot releases. I cannot remember the last time that I used them in an SQL expression like this with either a file geodatabase or a shapefile.

            – PolyGeo
            45 mins ago






          • 1





            I Think you are correct. I just tried it and it does work without field delimiters.

            – BERA
            40 mins ago



















          • I dont think it will with shape or fgdb input since they will need double quotes around the field name. Unless inputFieldname = '"somefield"'

            – BERA
            52 mins ago








          • 1





            @BERA My understanding is that ArcGIS has been very forgiving on field delimiters for the last 3-4 dot releases. I cannot remember the last time that I used them in an SQL expression like this with either a file geodatabase or a shapefile.

            – PolyGeo
            45 mins ago






          • 1





            I Think you are correct. I just tried it and it does work without field delimiters.

            – BERA
            40 mins ago

















          I dont think it will with shape or fgdb input since they will need double quotes around the field name. Unless inputFieldname = '"somefield"'

          – BERA
          52 mins ago







          I dont think it will with shape or fgdb input since they will need double quotes around the field name. Unless inputFieldname = '"somefield"'

          – BERA
          52 mins ago






          1




          1





          @BERA My understanding is that ArcGIS has been very forgiving on field delimiters for the last 3-4 dot releases. I cannot remember the last time that I used them in an SQL expression like this with either a file geodatabase or a shapefile.

          – PolyGeo
          45 mins ago





          @BERA My understanding is that ArcGIS has been very forgiving on field delimiters for the last 3-4 dot releases. I cannot remember the last time that I used them in an SQL expression like this with either a file geodatabase or a shapefile.

          – PolyGeo
          45 mins ago




          1




          1





          I Think you are correct. I just tried it and it does work without field delimiters.

          – BERA
          40 mins ago





          I Think you are correct. I just tried it and it does work without field delimiters.

          – BERA
          40 mins ago


















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