在Python中定义SDE连接的工作区

我们如何在Python脚本中为工作区定义SDE连接？

DEWright击败了我，他是对的，就像在ArcCatalog中一样使用连接。但是，这是我在ArcMap中的Python提示符下使用sde连接文件的直接完整路径完成的操作：

>>> import arcpy
>>> arcpy.env.workspace = "C:\\Users\\chad\\AppData\\Roaming\\ESRI\\Desktop10.0\\ArcCatalog\\anrc_water (anrcuser).sde"
>>> fdlist = arcpy.ListDatasets()
>>> for fd in fdlist:
...     print fd
... 
anrc_water.DBO.ChadTest
anrc_water.DBO.Temp_Data
anrc_water.DBO.Master_Datasets
ANRC_WATER.DBO.ENF_FILL_FACC
ANRC_WATER.DBO.ENF_FILL_FDIR

>>> 

要获取sde连接文件的路径，只需在目录树中的SDE数据库上单击鼠标右键，转到属性，然后在“常规”选项卡上，从“名称”字段复制路径：

此页面上的示例3到5对于这个问题是惊人的：http : //help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//0017000000q7000000

这是我制作的简化版本，可让我仅使用Sql Server直接连接在python中进行即时连接。

"""
Name: sdeconn.py
Description: Utility functions for sde connections
"""

# Import system modules
import arcpy, os, sys

def connect(database, server="<default server>", username="<default user>", password="<default password>", version="SDE.DEFAULT"):
    # Check if value entered for option
    try:
        #Usage parameters for spatial database connection to upgrade
        service = "sde:sqlserver:" + server 
        account_authentication = 'DATABASE_AUTH'
        version = version.upper()
        database = database.lower()

        # Check if direct connection
        if service.find(":") <> -1:  #This is direct connect
            ServiceConnFileName = service.replace(":", "")
            ServiceConnFileName = ServiceConnFileName.replace(";", "")
            ServiceConnFileName = ServiceConnFileName.replace("=", "")
            ServiceConnFileName = ServiceConnFileName.replace("/", "")
            ServiceConnFileName = ServiceConnFileName.replace("\\", "")
        else:
            arcpy.AddMessage("\n+++++++++")
            arcpy.AddMessage("Exiting!!")
            arcpy.AddMessage("+++++++++")
            sys.exit("\nSyntax for a direct connection in the Service parameter is required for geodatabase upgrade.")

        # Local variables
        Conn_File_NameT = server + "_" + ServiceConnFileName + "_" + database + "_" + username    

        if os.environ.get("TEMP") == None:
            temp = "c:\\temp"   
        else:
            temp = os.environ.get("TEMP")

        if os.environ.get("TMP") == None:
            temp = "/usr/tmp"       
        else:
            temp = os.environ.get("TMP")  

        Connection_File_Name = temp + os.sep + Conn_File_NameT + ".sde"
        if os.path.isfile(Connection_File_Name):
            return Connection_File_Name

        # Check for the .sde file and delete it if present
        arcpy.env.overwriteOutput=True


        # Variables defined within the script; other variable options commented out at the end of the line
        saveUserInfo = "SAVE_USERNAME" #DO_NOT_SAVE_USERNAME
        saveVersionInfo = "SAVE_VERSION" #DO_NOT_SAVE_VERSION


        print "\nCreating ArcSDE Connection File...\n"
        # Process: Create ArcSDE Connection File...
        # Usage: out_folder_path, out_name, server, service, database, account_authentication, username, password, save_username_password, version,   save_version_info
        print temp
        print Conn_File_NameT
        print server
        print service
        print database
        print account_authentication
        print username
        print password
        print saveUserInfo
        print version
        print saveVersionInfo
        arcpy.CreateArcSDEConnectionFile_management(temp, Conn_File_NameT, server, service, database, account_authentication, username, password, saveUserInfo, version, saveVersionInfo)
        for i in range(arcpy.GetMessageCount()):
            if "000565" in arcpy.GetMessage(i):   #Check if database connection was successful
                arcpy.AddReturnMessage(i)
                arcpy.AddMessage("\n+++++++++")
                arcpy.AddMessage("Exiting!!")
                arcpy.AddMessage("+++++++++\n")
                sys.exit(3)            
            else:
                arcpy.AddReturnMessage(i)
                arcpy.AddMessage("+++++++++\n")
                return Connection_File_Name
    #Check if no value entered for option   
    except SystemExit as e:
        print e.code
        return

使用此脚本，我可以通过简单地调用以下命令即时创建连接文件：

import arcpy, sdeconn
myconnect1 = sdeconn.connect("database1", "server")
myconnect2 = sdeconn.connect("database2", "server")

这消除了数据库连接文件是从机不一致机或用户配置文件，用户配置文件的问题。

您需要像在ArcCatalog中通常那样定义SDE连接文档。然后，您将像这样在Python中创建图层的路径：

DataConnections = "C:\\AGS_GCSS_Tools\\DatabaseConnections\\" 
TCA_Connection = "prod_sde.sde\\prod_SDE.GIS.PropertyTax" + CAPSYear + "\\prod_SDE.GIS.Tca"
TCA_Layer = DataConnections + TCA_Connection

这会将您的路径设置为您的.SDE文件所在的位置，但是随后您将该连接内的路径设置为您要查找的图层。就我而言，我还设置了Year变量。

您还可以直接在Query中定义连接路径。

PathSdeConnection= "C:\\Users\\{Username Of windows}\\AppData\\Roaming\\ESRI\\Desktop10.2\\ArcCatalog\\{name of ConenctionString}.sde

并在搜索等中使用它

with arcpy.da.SearchCursor(PathSdeConnection,("OBJECTID","SHAPE@","SHAPE@JSON"),{WhereClause})as cursor:
     for row in cursor:
                       .
                       .
                       .