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 Jan 16 at 11:11









      PolyGeo

      53.3k1779238




      53.3k1779238










      asked Jan 16 at 10:59









      AndreasAndreas

      183




      183






















          2 Answers
          2






          active

          oldest

          votes


















          3














          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
            Jan 16 at 11:06











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

            – BERA
            Jan 16 at 11:07



















          1














          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
            Jan 16 at 11:20








          • 3





            @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
            Jan 16 at 11:27






          • 1





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

            – BERA
            Jan 16 at 11:32











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          2 Answers
          2






          active

          oldest

          votes








          2 Answers
          2






          active

          oldest

          votes









          active

          oldest

          votes






          active

          oldest

          votes









          3














          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
            Jan 16 at 11:06











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

            – BERA
            Jan 16 at 11:07
















          3














          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
            Jan 16 at 11:06











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

            – BERA
            Jan 16 at 11:07














          3












          3








          3







          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 Jan 16 at 11:01









          BERABERA

          15.2k52042




          15.2k52042








          • 1





            Thank you! Works perfect!

            – Andreas
            Jan 16 at 11:06











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

            – BERA
            Jan 16 at 11:07














          • 1





            Thank you! Works perfect!

            – Andreas
            Jan 16 at 11:06











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

            – BERA
            Jan 16 at 11:07








          1




          1





          Thank you! Works perfect!

          – Andreas
          Jan 16 at 11:06





          Thank you! Works perfect!

          – Andreas
          Jan 16 at 11:06













          @Andreas Nice! Please accept my answer with the checkbox

          – BERA
          Jan 16 at 11:07





          @Andreas Nice! Please accept my answer with the checkbox

          – BERA
          Jan 16 at 11:07













          1














          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
            Jan 16 at 11:20








          • 3





            @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
            Jan 16 at 11:27






          • 1





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

            – BERA
            Jan 16 at 11:32
















          1














          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
            Jan 16 at 11:20








          • 3





            @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
            Jan 16 at 11:27






          • 1





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

            – BERA
            Jan 16 at 11:32














          1












          1








          1







          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 Jan 16 at 11:14









          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
            Jan 16 at 11:20








          • 3





            @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
            Jan 16 at 11:27






          • 1





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

            – BERA
            Jan 16 at 11:32



















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

            – BERA
            Jan 16 at 11:20








          • 3





            @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
            Jan 16 at 11:27






          • 1





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

            – BERA
            Jan 16 at 11:32

















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

          – BERA
          Jan 16 at 11:20







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

          – BERA
          Jan 16 at 11:20






          3




          3





          @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
          Jan 16 at 11:27





          @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
          Jan 16 at 11:27




          1




          1





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

          – BERA
          Jan 16 at 11:32





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

          – BERA
          Jan 16 at 11:32


















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