设置值时使用 UpdateCursor 时出现问题

Question

使用 ArcDesktop 10.1 和 Python 2.7：我正在编写一个代码，该代码在 13 个字段中搜索值，并根据它在这 13 个字段中找到的内容，连接一个字符串并将结果放入现有（空）字段中。

它使用搜索光标来搜索这 13 个字段。然后在更新游标中使用该结果连接字符串。

我无法使用 setValue 将结果输入字段 - 下面代码的第 40 行 @ urow.setValue(commentsField, easementType)。错误消息非常无用（RuntimeError：ERROR 999999：执行函数时出错。）

我不确定如何正确获取所需字段中设置的值。任何帮助将不胜感激！

import arcpy, os, math
from itertools import izip
arcpy.env.workspace = "C:\Users\mdelgado\Desktop\WorkinDog.gdb"

#These are my variables
fc = "EASEMENTS"
commentsField = "Comments"
typeFields = ["ABANDONED", "ACCESS", "AERIAL", "BLANKET", "COMM", "DRAIN", "ELEC", "GEN_UTIL", "LANDSCAPE", "PARKING", "PIPELINE", "SAN_SEWR", "SIDEWALK", "SPECIAL", "STM_SEWR", "WATER"]
fieldNames = ["ABANDONED", "ACCESS", "AERIAL", "BLANKET", "COMMUNICATION", "DRAINAGE", "ELECTRIC", "GENERAL UTILITY", "LANDSCAPE", "PARKING", "PIPELINE", "SANITATION SEWER", "SIDEWALK", "SPECIAL", "STORM SEWER", "WATER"]
fieldValues = []
easementType = ""

#This is my search cursor
scursor = arcpy.SearchCursor(fc)
srow = scursor.next()
for field in typeFields:
    srowValue = (srow.getValue(field))
    fieldValues.append(srowValue)
    srow = scursor.next()
print fieldValues

#This is my update cursor
ucursor = arcpy.UpdateCursor(fc)
for urow in ucursor:

    #This is where I begin the loop to concatenate the comment field
    for (value, name) in izip(fieldValues, fieldNames):
        print str(value) + " " + name

        #This is where I check each field to find out which types the easement is
        if value == 1:
            easementType = easementType + name + ", "

    #This is where I format the final concatenated string
    easementType = easementType[:-2]
    print easementType

    #This is where the field is updated with the final string using the cursor
    urow.setValue(commentsField, easementType)
    ucursor.updateRow(urow)
    urow = cursor.next()

del urow
del ucursor
del srow
del scursor

Answer 1

没有信息的 999999 错误是最糟糕的错误之一。

我建议对您的方法进行一些修改，以简化故障排除。首先，use the da Cursors——它们速度更快，语法也更简单。

其次，您不需要单独的搜索和更新 -- 除了更新字段外，更新还可以 "search" 同一行中的其他字段。（当前代码，假设它工作正常，会将相同的 fieldValues 放入 UpdateCursor 受影响的每一行。）

fieldNames = ["ABANDONED", "ACCESS", "AERIAL", "BLANKET", "COMMUNICATION", "DRAINAGE",
              "ELECTRIC", "GENERAL UTILITY", "LANDSCAPE", "PARKING", "PIPELINE", "SANITATION SEWER",
              "SIDEWALK", "SPECIAL", "STORM SEWER", "WATER"]
cursorFields = ["ABANDONED", "ACCESS", "AERIAL", "BLANKET", "COMM", "DRAIN", 
                "ELEC", "GEN_UTIL", "LANDSCAPE", "PARKING", "PIPELINE", "SAN_SEWR",
                "SIDEWALK", "SPECIAL", "STM_SEWR", "WATER", "Comments"]

with arcpy.da.UpdateCursor(fc, cursorFields) as cursor:
    for row in cursor:
        easementType = ""
        for x in range(13):
            if row[x] == 1:
                easementType += fieldNames[x] + ", "
        easementType = easementType[:-2]
        print easementType

        row[13] = easementType
        cursor.updateRow(row)

设置值时使用 UpdateCursor 时出现问题

Trouble using UpdateCursor when setting the value

esri

arcgis

python-2.7