functions/Copy-DbaDatabaseAssembly.ps1

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function Copy-DbaDatabaseAssembly {
    <#
  .SYNOPSIS
   Copy-DbaDatabaseAssembly migrates assemblies from one SQL Server to another.
 
  .DESCRIPTION
   By default, all assemblies are copied.
    
   If the assembly already exists on the destination, it will be skipped unless -Force is used.
    
   This script does not yet copy dependencies or dependent objects.
 
  .PARAMETER Source
   Source SQL Server. You must have sysadmin access and server version must be SQL Server version 2000 or higher.
 
  .PARAMETER SourceSqlCredential
   Allows you to login to servers using SQL Logins instead of Windows Authentication (AKA Integrated or Trusted). To use:
 
   $scred = Get-Credential, then pass $scred object to the -SourceSqlCredential parameter.
 
   Windows Authentication will be used if SourceSqlCredential is not specified. SQL Server does not accept Windows credentials being passed as credentials.
 
   To connect as a different Windows user, run PowerShell as that user.
 
  .PARAMETER Destination
   Destination SQL Server. You must have sysadmin access and the server must be SQL Server 2000 or higher.
 
  .PARAMETER DestinationSqlCredential
   Allows you to login to servers using SQL Logins instead of Windows Authentication (AKA Integrated or Trusted). To use:
 
   $dcred = Get-Credential, then pass this $dcred to the -DestinationSqlCredential parameter.
 
   Windows Authentication will be used if DestinationSqlCredential is not specified. SQL Server does not accept Windows credentials being passed as credentials.
 
   To connect as a different Windows user, run PowerShell as that user.
 
  .PARAMETER Assembly
   The assembly(ies) to process. This list is auto-populated from the server. If unspecified, all assemblies will be processed.
 
  .PARAMETER ExcludeAssembly
   The assembly(ies) to exclude. This list is auto-populated from the server.
 
  .PARAMETER WhatIf
   If this switch is enabled, no actions are performed but informational messages will be displayed that explain what would happen if the command were to run.
 
  .PARAMETER Confirm
   If this switch is enabled, you will be prompted for confirmation before executing any operations that change state.
 
  .PARAMETER Silent
   If this switch is enabled, the internal messaging functions will be silenced.
 
  .PARAMETER Force
   If this switch is enabled, existing assemblies on Destination with matching names from Source will be dropped.
    
  .NOTES
   Tags: Migration, Assembly
   Author: Chrissy LeMaire (@cl), netnerds.net
   Requires: sysadmin access on SQL Servers
 
   Website: https://dbatools.io
   Copyright: (C) Chrissy LeMaire, clemaire@gmail.com
   License: GNU GPL v3 https://opensource.org/licenses/GPL-3.0
 
  .LINK
   http://dbatools.io/Get-SqlDatabaseAssembly
 
  .EXAMPLE
   Copy-DbaDatabaseAssembly -Source sqlserver2014a -Destination sqlcluster
 
   Copies all assemblies from sqlserver2014a to sqlcluster using Windows credentials. If assemblies with the same name exist on sqlcluster, they will be skipped.
 
  .EXAMPLE
   Copy-DbaDatabaseAssembly -Source sqlserver2014a -Destination sqlcluster -Assembly dbname.assemblyname, dbname3.anotherassembly -SourceSqlCredential $cred -Force
 
   Copies two assemblies, the dbname.assemblyname and dbname3.anotherassembly from sqlserver2014a to sqlcluster using SQL credentials for sqlserver2014a and Windows credentials for sqlcluster. If an assembly with the same name exists on sqlcluster, it will be dropped and recreated because -Force was used.
 
   In this example, anotherassembly will be copied to the dbname3 database on the server sqlcluster.
 
  .EXAMPLE
   Copy-DbaThing -Source sqlserver2014a -Destination sqlcluster -WhatIf -Force
 
   Shows what would happen if the command were executed using force.
 #>

    [CmdletBinding(DefaultParameterSetName = "Default", SupportsShouldProcess = $true)]
    param (
        [parameter(Mandatory = $true)]
        [DbaInstanceParameter]$Source,
        [PSCredential]$SourceSqlCredential,
        [parameter(Mandatory = $true)]
        [DbaInstanceParameter]$Destination,
        [PSCredential]$DestinationSqlCredential,
        [object[]]$Assembly,
        [object[]]$ExcludeAssembly,
        [switch]$Force,
        [switch]$Silent
    )
    begin {

        $sourceServer = Connect-SqlInstance -SqlInstance $Source -SqlCredential $SourceSqlCredential
        $destServer = Connect-SqlInstance -SqlInstance $Destination -SqlCredential $DestinationSqlCredential

        $source = $sourceServer.DomainInstanceName
        $destination = $destServer.DomainInstanceName

        if ($sourceServer.VersionMajor -lt 9 -or $destServer.VersionMajor -lt 9) {
            throw "Assemblies are only supported in SQL Server 2005 and newer. Quitting."
        }
    }
    process {

        $sourceAssemblies = @()
        foreach ($database in $sourceServer.Databases) {
            try {
                # a bug here requires a try/catch
                $userAssemblies = $database.Assemblies | Where-Object IsSystemObject -eq $false
                foreach ($assembly in $userAssemblies) {
                    $sourceAssemblies += $assembly
                }
            }
            catch { }
        }

        $destAssemblies = @()
        foreach ($database in $destServer.Databases) {
            try {
                # a bug here requires a try/catch
                $userAssemblies = $database.Assemblies | Where-Object IsSystemObject -eq $false
                foreach ($assembly in $userAssemblies) {
                    $destAssemblies += $assembly
                }
            }
            catch { }
        }

        foreach ($currentAssembly in $sourceAssemblies) {
            $assemblyName = $currentAssembly.Name
            $dbName = $currentAssembly.Parent.Name
            $destDb = $destServer.Databases[$dbName]

            $copyDbAssemblyStatus = [pscustomobject]@{
                SourceServer        = $sourceServer.Name
                SourceDatabase      = $dbName
                DestinationServer   = $destServer.Name
                DestinationDatabase = $destDb
                Name                = $assemblyName
                Status              = $null
                DateTime            = [Sqlcollaborative.Dbatools.Utility.DbaDateTime](Get-Date)
            }


            if (!$destDb) {
                $copyDbAssemblyStatus.Status = "Skipped"
                $copyDbAssemblyStatus

                Write-Message -Level Warning -Message "Destination database $dbName does not exist. Skipping $assemblyName.";
                continue
            }

            if ($Assembly -and $Assembly -notcontains "$dbName.$assemblyName" -or $ExcludeAssembly -contains "$dbName.$assemblyName") {
                continue
            }

            if ($currentAssembly.AssemblySecurityLevel -eq "External" -and $destDb.Trustworthy -eq $false) {
                if ($Pscmdlet.ShouldProcess($destination, "Setting $dbName to External")) {
                    Write-Message -Level Warning -Message "Setting $dbName Security Level to External on $destination."
                    $sql = "ALTER DATABASE $dbName SET TRUSTWORTHY ON"
                    try {
                        Write-Message -Level Debug -Message $sql
                        $destServer.Query($sql)
                    }
                    catch {
                        $copyDbAssemblyStatus.Status = "Failed"
                        $copyDbAssemblyStatus

                        Stop-Function -Message "Issue setting security level." -Target $destDb -InnerErrorRecord $_
                    }
                }
            }

            if ($destServer.Databases[$dbName].Assemblies.Name -contains $currentAssembly.name) {
                if ($force -eq $false) {
                    $copyDbAssemblyStatus.Status = "Skipped"
                    $copyDbAssemblyStatus

                    Write-Message -Level Warning -Message "Assembly $assemblyName exists at destination in the $dbName database. Use -Force to drop and migrate."
                    continue
                }
                else {
                    if ($Pscmdlet.ShouldProcess($destination, "Dropping assembly $assemblyName and recreating")) {
                        try {
                            Write-Message -Level Verbose -Message "Dropping assembly $assemblyName."
                            Write-Message -Level Verbose -Message "This won't work if there are dependencies."
                            $destServer.Databases[$dbName].Assemblies[$assemblyName].Drop()
                            Write-Message -Level Verbose -Message "Copying assembly $assemblyName."
                            $sql = $currentAssembly.Script()
                            Write-Message -Level Debug -Message $sql
                            $destServer.Query($sql,$dbName)
                        }
                        catch {
                            $copyDbAssemblyStatus.Status = "Failed"
                            $copyDbAssemblyStatus

                            Stop-Function -Message "Issue dropping assembly." -Target $assemblyName -InnerErrorRecord $_ -Continue
                        }
                    }
                }
            }

            if ($Pscmdlet.ShouldProcess($destination, "Creating assembly $assemblyName")) {
                try {
                    Write-Message -Level Verbose -Message "Copying assembly $assemblyName from database."
                    $sql = $currentAssembly.Script()
                    Write-Message -Level Debug -Message $sql
                    $destServer.Query($sql,$dbName)

                    $copyDbAssemblyStatus.Status = "Successful"
                    $copyDbAssemblyStatus

                }
                catch {
                    $copyDbAssemblyStatus.Status = "Failed"
                    $copyDbAssemblyStatus

                    Stop-Function -Message "Issue creating assembly." -Target $assemblyName -InnerErrorRecord $_
                }
            }
        }
    }
    end {
        Test-DbaDeprecation -DeprecatedOn "1.0.0" -Silent:$false -Alias Copy-SqlDatabaseAssembly
    }
}