functions/Select-DbaObject.ps1
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function Select-DbaObject { <# .SYNOPSIS Wrapper around Select-Object, extends property parameter. .DESCRIPTION Wrapper around Select-Object, extends property parameter. This function allows specifying in-line transformation of the properties specified without needing to use complex hashtables. Without removing the ability to specify just those hashtables. See the description of the Property parameter for an exhaustive list of legal notations. .PARAMETER InputObject The object(s) to select from. .PARAMETER Property The properties to select. - Supports hashtables, which will be passed through to Select-Object. - Supports renaming as it is possible in SQL: "Length AS Size" will select the Length property but rename it to size. - Supports casting to a specified type: "Address to IPAddress" or "Length to int". Uses PowerShell type-conversion. - Supports parsing numbers to sizes: "Length size GB:2" Converts numeric input (presumed to be bytes) to gigabyte with two decimals. Also supports toggling on Unit descriptors by adding another element: "Length size GB:2:1" - Supports selecting properties from objects in other variables: "ComputerName from VarName" (Will insert the property 'ComputerName' from variable $VarName) - Supports filtering when selecting from outside objects: "ComputerName from VarName where ObjectId = Id" (Will insert the property 'ComputerName' from the object in variable $VarName, whose ObjectId property is equal to the inputs Id property) Important: When using this command from another module (not script-files, those are fine), you do not have access to the variables in the calling module. In order to select from other variables using the 'from' call, you need to declare the variable global. .PARAMETER ExcludeProperty Properties to not list. .PARAMETER ExpandProperty Properties to expand. .PARAMETER Unique Do not list multiples of the same value. .PARAMETER Last Select the last n items. .PARAMETER First Select the first n items. .PARAMETER Skip Skip the first (or last if used with -Last) n items. .PARAMETER SkipLast Skip the last n items. .PARAMETER Wait Indicates that the cmdlet turns off optimization.Windows PowerShell runs commands in the order that they appear in the command pipeline and lets them generate all objects. By default, if you include a Select-Object command with the First or Index parameters in a command pipeline, Windows PowerShell stops the command that generates the objects as soon as the selected number of objects is generated. .PARAMETER Index Specifies an array of objects based on their index values. Enter the indexes in a comma-separated list. .EXAMPLE PS C:\> Get-ChildItem | Select-DbaObject Name, "Length as Size" Selects the properties Name and Length, renaming Length to Size in the process. .EXAMPLE PS C:\> Import-Csv .\file.csv | Select-DbaObject Name, "Length as Size to DbaSize" Selects the properties Name and Length, renaming Length to Size and converting it to [DbaSize] (a userfriendly representation of size numbers) .EXAMPLE PS C:\> $obj = [PSCustomObject]@{ Name = "Foo" } PS C:\> Get-ChildItem | Select-DbaObject FullName, Length, "Name from obj" Selects the properties FullName and Length from the input and the Name property from the object stored in $obj .EXAMPLE PS C:\> $list = @() PS C:\> $list += [PSCustomObject]@{ Type = "Foo"; ID = 1 } PS C:\> $list += [PSCustomObject]@{ Type = "Bar"; ID = 2 } PS C:\> $obj | Select-DbaObject Name, "ID from list WHERE Type = Name" This allows you to LEFT JOIN contents of another variable. Note that it can only do simple property-matching at this point. It will select Name from the objects stored in $obj, and for each of those the ID Property on any object in $list that has a Type property of equal value as Name on the input. #> [CmdletBinding(DefaultParameterSetName = 'DefaultParameter', RemotingCapability = 'None')] param ( [Parameter(ValueFromPipeline = $true)] [psobject] $InputObject, [Parameter(ParameterSetName = 'DefaultParameter', Position = 0)] [Parameter(ParameterSetName = 'SkipLastParameter', Position = 0)] [SqlCollaborative.Dbatools.Parameter.DbaSelectParameter[]] $Property, [Parameter(ParameterSetName = 'SkipLastParameter')] [Parameter(ParameterSetName = 'DefaultParameter')] [string[]] $ExcludeProperty, [Parameter(ParameterSetName = 'DefaultParameter')] [Parameter(ParameterSetName = 'SkipLastParameter')] [string] $ExpandProperty, [switch] $Unique, [Parameter(ParameterSetName = 'DefaultParameter')] [ValidateRange(0, 2147483647)] [int] $Last, [Parameter(ParameterSetName = 'DefaultParameter')] [ValidateRange(0, 2147483647)] [int] $First, [Parameter(ParameterSetName = 'DefaultParameter')] [ValidateRange(0, 2147483647)] [int] $Skip, [Parameter(ParameterSetName = 'SkipLastParameter')] [ValidateRange(0, 2147483647)] [int] $SkipLast, [Parameter(ParameterSetName = 'IndexParameter')] [Parameter(ParameterSetName = 'DefaultParameter')] [switch] $Wait, [Parameter(ParameterSetName = 'IndexParameter')] [ValidateRange(0, 2147483647)] [int[]] $Index ) begin { try { $outBuffer = $null if ($PSBoundParameters.TryGetValue('OutBuffer', [ref]$outBuffer)) { $PSBoundParameters['OutBuffer'] = 1 } $clonedParameters = @{ } foreach ($key in $PSBoundParameters.Keys) { if ($key -ne "Property") { $clonedParameters[$key] = $PSBoundParameters[$key] } } if (Test-Bound -ParameterName 'Property') { $clonedParameters['Property'] = $Property.Value } $wrappedCmd = $ExecutionContext.InvokeCommand.GetCommand('Microsoft.PowerShell.Utility\Select-Object', [System.Management.Automation.CommandTypes]::Cmdlet) $scriptCmd = { & $wrappedCmd @clonedParameters } $steppablePipeline = $scriptCmd.GetSteppablePipeline($myInvocation.CommandOrigin) $steppablePipeline.Begin($PSCmdlet) } catch { throw } } process { try { $steppablePipeline.Process($_) } catch { throw } } end { try { $steppablePipeline.End() } catch { throw } } } |