update SPList using csv via Powershell

Question

knowing that is possible in PS, exporting SPList items to PS objects(link1 link2) what is the best way, to go into the other way: Create/Update an SPList from an exported csv or format-table.

Answer 1

After creating manually an list based on or csv template via UI...

#get data
$csv = Import-Csv ‘C:\MyData.csv‘
#get list
$web = Get-SPWeb -identity “MyTargetListURL”

foreach ($row in $csv) {
    #Check for existing item
    $SPItem = $SPList.Items | Where { $_["ItemId"] -eq $row.ItemId } 

    If ($SPItem -ne $null) { 
        $SPItem["ColumnNumberType"] = [System.Convert]::ToInt32($row.ColumnNumberType)
        $SPItem["Column with special-chars"] = $row."Column with special-chars"
        #rest of fields

        $SPItem.Update() 
    } 
    Else { 
        $SPNewItem = $SPList.Items.Add() 
        $SPNewItem["ItemId"] = $row.ItemId 
        #rest of fields

        $SPNewItem.Update() 
    } 
 }

Answer 2

There are 3rd party tools that can automate the update process (only changed items updated, so you can add workflows or attachments).

See here for step-by-step guide: http://www.layer2.de/en/community/FAQs/BDLC/Pages/How-to-connect-text-file-to-sharepoint-list.aspx