如何使用元数据（列）从 Sharepoint 文件夹中检索文件以检查文件是否存在？

Question

我想使用 Add-PnPFile 将文件上传到 SharePoint，但它每次都会覆盖文件。我想检查文件是否存在？如果是，那么它是否在最后一天被修改？如果是，那么我将上传文件（使用 add-pnpfile 覆盖现有文件）否则我将跳过该文件并检查下一个文件？

还有吗？

#install and import module
Import-Module SharePointPnPPowerShellOnline 

#Get Connection to the url
Connect-PnPOnline "Some SharePoint Url" -UseWebLogin

#get the files from a local folder
$Files = Get-ChildItem "C:\Some Local FolderPath" -Recurse

#Now check wether the file is being modified or not ? 
foreach($File in $Files){
    
#Logic to check if the file exists in the sharepoint folder or not ? If it exist then i want to check wether it is being modified or not ? if yes then i will add the file
#if not then i will skip that file and check for other files.
        
        #Calculating LastWritetime for the file.
        $LastWriteTimeForThisFile = $File.LastWriteTime.Day
        $difference = (Get-Date).Day - $LastWriteTimeForThisFile
    
        if(file exists ? then check the difference in Lastmodified dates)
        if ( $difference -lt 1) 
        {
         
         $upload = Add-PnPFile -Path $File.FullName -Folder $SharePointFolderPath
         $message = "Successfully Uploaded"  #this i will be having an entry in log file.
        }
        else{
         $message = Not Modified so not uploading again #this i will be having an entry in log file.
        }
    }

Answer 1

您可以尝试以下方法，它应该适合您。

foreach($File in $Files){
    #Calculating LastWritetime for the file.
    $LastWriteTimeForThisFile = $File.LastWriteTime
    $difference = (Get-Date) - $LastWriteTimeForThisFile
    
    #Check if File exists Already
    $fileURL= $SharePointFolderPath+"/"+$file.name

    $FileExists = Get-PnPFile -Url $fileURL -ErrorAction SilentlyContinue
    
    if($FileExists){
        if ( $difference.days -lt 1) {         
         $upload = Add-PnPFile -Path $File.FullName -Folder $SharePointFolderPath
         $message = "Successfully Uploaded"  #this i will be having an entry in log file.
        }
        else{
         $message = Not Modified so not uploading again #this i will be having an entry in log file.
        }
    }
    #If File doesnot exist, upload the file.
    Else{
        $upload = Add-PnPFile -Path $File.FullName -Folder $SharePointFolderPath
        $message = "Successfully Uploaded"  #this i will be having an entry in log file.
    }
}

如何使用元数据（列）从 Sharepoint 文件夹中检索文件以检查文件是否存在？

How to retrieve files from a Sharepoint Folder with metadata(column) to check wether the file exists or not?

powershell

sharepoint

file-upload

sharepoint-online

last-modified