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Deleting List Items
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To delete items from a list in SharePoint 2010, use the Delete method provided by the SPListItem class In the next example, we use the GetItemById method to retrieve a list item, and then remove the item
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PS > $spList = Get-SPList -url http://nimaintranet/Lists/Custom List" PS > $spListItem = $spListGetItemById(1) PS > $spListItemDelete()
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Managing SharePoint List Items
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Using the Delete method to remove a large number of list items will take time and consume a lot of memory, since it loads each list item into memory A better approach to removing many items from a list is to use the ProcessBatchData method provided by the SPWeb class First, you need a collection of the list items you want to remove, and then you can use the Get-SPListItem function to retrieve a list of items that match a given criteria, as shown in this example:
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PS > $spListItemCollection = >> Get-SPListItem -url "http://nimaintranet/Lists/Custom List" ` >> -field Choices -value "Second Choice"
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Now that we have a populated list item collection, we can create a CAML command string that we will use to remove all the list items in the list item collection The first part of the CAML string contains the XML declaration followed by the <Batch> tag
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PS > $batchRemove = '< xml version="10" encoding="UTF-8" ><Batch>'
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Next, we need to add a batch string of commands for each list item that we want to delete The CAML string used in the next example starts with the <Method> tag followed by the <SetList Scope="Request"> tag where we define the scope
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PS > $command = '<Method><SetList Scope="Request">' + >> $spListID + >>'</SetList><SetVar Name="ID">{0}</SetVar>' + >> '<SetVar Name="Cmd">Delete</SetVar></Method>'
In this example, we use the ID from the current list as value Next, we use the
<SetVar Name="ID"> and set that {0} should be the value Finally, we use the <SetVar Name="Cmd"> tag and specify Delete as the type of command to be
executed After we have created a CAML string, we will loop through each list item and append the query to the batchRemove variable
PS > foreach ($item in $spListItemCollection) { >> $batchRemove += $command -f $itemId >> }
Notice how we use the f operator to replace the format string {0} with each list item s ID Finally, we complete the CAML query by closing the <Batch> tag
PS > $batchRemove += "</Batch>"
The last step is to execute the command using the ProcessBatchData method of the SPWeb class
PS > $spListParentWebProcessBatchData($batchRemove) | Out-Null
PowerShell for Microsoft SharePoint 2010 Administrators
The following function, Remove-SPListItem, demonstrates how to wrap the code in a reusable function so that we can remove one or more list items with a single line of code
function Remove-SPListItem ( [string]$url, [string]$field, [string]$value, [int]$rowLimit = 100 ) { # Use the Get-SPList function to retrieve a list $spList = Get-SPList -url $url # Create Query based on field and value $camlQuery = '<Where><Eq><FieldRef Name="' + $field + '"/><Value Type="' + $spListFields[$field]Type + '">' + $value + '</Value></Eq></Where>'; $spQuery = New-Object MicrosoftSharePointSPQuery; $spQueryQuery = $camlQuery; $spQueryRowLimit = $rowLimit; $spListItemCollection = $spListGetItems($spQuery); # Create batch remove CAML query $batchRemove = '< xml version="10" encoding="UTF-8" ><Batch>'; # The command is used for each list item retrieved $command = '<Method><SetList Scope="Request">' + $spListID +'</SetList><SetVar Name="ID">{0}</SetVar> + <SetVar Name="Cmd">Delete</SetVar></Method>'; foreach ($item in $spListItemCollection) { # Loop through each list item and add the string # to the batch command $batchRemove += $command -f $itemId; } $batchRemove += "</Batch>";
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Managing SharePoint List Items
# Remove the list items using the # batch command $spListParentWebProcessBatchData($batchRemove) | Out-Null }
Run the function by typing the following:
PS > Remove-SPListItem -url "http://nimaintranet/Lists/Custom List" ` >> -field Choices -value "Second Choice"
This example removes all list items where the value of the Choices field equals Second Choice The script removes list items in batches of 100, as it is specified as the default value in the function
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