functions/Get-DbaRgClassifierFunction.ps1

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function Get-DbaRgClassifierFunction {
<#
    .SYNOPSIS
        Gets the Resource Governor custom classifier Function
 
    .DESCRIPTION
        Gets the Resource Governor custom classifier Function which is used for customize the workload groups usage
 
    .PARAMETER SqlInstance
        The target SQL Server instance or instances
 
    .PARAMETER SqlCredential
        Allows you to login to SQL Server using alternative credentials
 
    .PARAMETER InputObject
        Allows input to be piped from Get-DbaResourceGovernor
 
    .PARAMETER EnableException
        By default, when something goes wrong we try to catch it, interpret it and give you a friendly warning message.
        This avoids overwhelming you with "sea of red" exceptions, but is inconvenient because it basically disables advanced scripting.
        Using this switch turns this "nice by default" feature off and enables you to catch exceptions with your own try/catch.
 
    .NOTES
        Tags: Migration, ResourceGovernor
        Author: Alessandro Alpi (@suxstellino), alessandroalpi.blog
 
        Website: https://dbatools.io
        Copyright: (c) 2018 by dbatools, licensed under MIT
        License: MIT https://opensource.org/licenses/MIT
 
    .LINK
        https://dbatools.io/Get-DbaRgClassifierFunction
 
    .EXAMPLE
        PS C:\> Get-DbaRgClassifierFunction -SqlInstance sql2016
 
        Gets the classifier function from sql2016
 
    .EXAMPLE
        PS C:\> 'Sql1','Sql2/sqlexpress' | Get-DbaResourceGovernor | Get-DbaRgClassifierFunction
 
        Gets the classifier function object on Sql1 and Sql2/sqlexpress instances
 
#>

    [CmdletBinding()]
    param (
        [DbaInstanceParameter[]]$SqlInstance,
        [PSCredential]$SqlCredential,
        [parameter(ValueFromPipeline)]
        [Microsoft.SqlServer.Management.Smo.ResourceGovernor[]]$InputObject,
        [switch]$EnableException
    )

    process {
        foreach ($instance in $SqlInstance) {
            $InputObject += Get-DbaResourceGovernor -SqlInstance $SqlInstance -SqlCredential $SqlCredential
        }

        foreach ($resourcegov in $InputObject) {
            $server = $resourcegov.Parent
            $classifierFunction = $null

            foreach ($currentFunction in $server.Databases["master"].UserDefinedFunctions) {
                $fullyQualifiedFunctionName = [string]::Format("[{0}].[{1}]", $currentFunction.Schema, $currentFunction.Name)
                if ($fullyQualifiedFunctionName -eq $InputObject.ClassifierFunction) {
                    $classifierFunction = $currentFunction
                }
            }

            if ($classifierFunction) {
                Add-Member -Force -InputObject $classifierFunction -MemberType NoteProperty -Name ComputerName -value $resourcegov.ComputerName
                Add-Member -Force -InputObject $classifierFunction -MemberType NoteProperty -Name InstanceName -value $resourcegov.InstanceName
                Add-Member -Force -InputObject $classifierFunction -MemberType NoteProperty -Name SqlInstance -value $resourcegov.SqlInstance
                Add-Member -Force -InputObject $classifierFunction -MemberType NoteProperty -Name Database -value 'master'
            }

            Select-DefaultView -InputObject $classifierFunction -Property ComputerName, InstanceName, SqlInstance, Database, Schema, CreateDate, DateLastModified, Name, DataType
        }
    }
}