functions/Export-DbaDacPackage.ps1

function Export-DbaDacPackage {
    <#
        .SYNOPSIS
            Exports a dacpac from a server.
 
        .DESCRIPTION
            Using SQLPackage, export a dacpac from an instance of SQL Server.
 
            Note - Extract from SQL Server is notoriously flaky - for example if you have three part references to external databases it will not work.
 
            For help with the extract action parameters and properties, refer to https://msdn.microsoft.com/en-us/library/hh550080(v=vs.103).aspx
 
        .PARAMETER SqlInstance
            SQL Server name or SMO object representing the SQL Server to connect to and publish to.
 
        .PARAMETER SqlCredential
            Allows you to login to servers using alternative logins instead Integrated, accepts Credential object created by Get-Credential
 
        .PARAMETER Path
            The directory where the .dacpac files will be exported to. Defaults to documents.
 
        .PARAMETER Database
            The database(s) to process - this list is auto-populated from the server. If unspecified, all databases will be processed.
 
        .PARAMETER ExcludeDatabase
            The database(s) to exclude - this list is auto-populated from the server
 
        .PARAMETER AllUserDatabases
            Run command against all user databases
 
        .PARAMETER ExtendedParameters
            Optional parameters used to extract the DACPAC. More information can be found at
            https://msdn.microsoft.com/en-us/library/hh550080.aspx
 
        .PARAMETER ExtendedProperties
            Optional properties used to extract the DACPAC. More information can be found at
            https://msdn.microsoft.com/en-us/library/hh550080.aspx
 
        .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, Database, Dacpac
            Author: Richie lee (@bzzzt_io)
 
            Website: https://dbatools.io
            Copyright: (C) Chrissy LeMaire, clemaire@gmail.com
            License: MIT https://opensource.org/licenses/MIT
 
        .LINK
            https://dbatools.io/Export-DbaDacPackage
 
        .EXAMPLE
            PS C:\> Export-DbaDacPackage -SqlInstance sql2016 -Database SharePoint_Config
 
            Exports the dacpac for SharePoint_Config on sql2016 to $home\Documents\SharePoint_Config.dacpac
 
        .EXAMPLE
            PS C:\> $moreprops = "/p:VerifyExtraction=$true /p:CommandTimeOut=10"
            PS C:\> Export-DbaDacPackage -SqlInstance sql2016 -Database SharePoint_Config -Path C:\temp -ExtendedProperties $moreprops
 
            Sets the CommandTimeout to 10 then extracts the dacpac for SharePoint_Config on sql2016 to C:\temp\SharePoint_Config.dacpac then verifies extraction.
    #>

    [CmdletBinding()]
    param
    (
        [parameter(Mandatory, ValueFromPipeline)]
        [Alias("ServerInstance", "SqlServer")]
        [DbaInstance[]]$SqlInstance,
        [Alias("Credential")]
        [PSCredential]$SqlCredential,
        [object[]]$Database,
        [object[]]$ExcludeDatabase,
        [switch]$AllUserDatabases,
        [string]$Path = "$home\Documents",
        [string]$ExtendedParameters,
        [string]$ExtendedProperties,
        [switch]$EnableException
    )

    process {
        if ((Test-Bound -Not -ParameterName Database) -and (Test-Bound -Not -ParameterName ExcludeDatabase) -and (Test-Bound -Not -ParameterName AllUserDatabases)) {
            Stop-Function -Message "You must specify databases to execute against using either -Database, -ExcludeDatabase or -AllUserDatabases"
        }

        if (-not (Test-Path $Path)) {
            Stop-Function -Message "$Path doesn't exist or access denied"
        }

        # Convert $Path to absolute path because relative paths are problematic when you mix PowerShell commands
        # and System.IO.
        # This must happen after Test-Path because Resolve-Path will throw an exception if a path does not exist.
        $Path = (Resolve-Path $Path).ProviderPath
        
        if ((Get-Item $path) -isnot [System.IO.DirectoryInfo]) {
            Stop-Function -Message "Path must be a directory"
        }

        foreach ($instance in $sqlinstance) {

            try {
                Write-Message -Level Verbose -Message "Connecting to $instance."
                $server = Connect-SqlInstance -SqlInstance $instance -SqlCredential $sqlcredential
            }
            catch {
                Stop-Function -Message "Failure" -Category ConnectionError -ErrorRecord $_ -Target $instance -Continue
            }
            $cleaninstance = $instance.ToString().Replace('\', '-')

            $dbs = $server.Databases | Where-Object { $_.IsSystemObject -eq $false -and $_.IsAccessible }

            if ($Database) {
                $dbs = $dbs | Where-Object Name -in $Database
                if (-not $dbs.name) {
                    Stop-Function -Message "Database $Database does not exist on $instance" -Target $instance -Continue
                }
            }

            if ($ExcludeDatabase) {
                $dbs = $dbs | Where-Object Name -notin $ExcludeDatabase
            }

            foreach ($db in $dbs) {
                $dbname = $db.name
                $connstring = $server.ConnectionContext.ConnectionString.Replace('"', "'")
                if ($connstring -notmatch 'Database=') {
                    $connstring = "$connstring;Database=$dbname"
                }
                $filename = "$Path\$cleaninstance-$dbname.dacpac"
                Write-Message -Level Verbose -Message "Exporting $filename"
                Write-Message -Level Verbose -Message "Using connection string $connstring"

                $sqlPackageArgs = "/action:Extract /tf:""$filename"" /SourceConnectionString:""$connstring"" $ExtendedParameters $ExtendedProperties"
                $resultstime = [diagnostics.stopwatch]::StartNew()

                try {
                    $startprocess = New-Object System.Diagnostics.ProcessStartInfo
                    $startprocess.FileName = "$script:PSModuleRoot\bin\smo\sqlpackage.exe"
                    $startprocess.Arguments = $sqlPackageArgs
                    $startprocess.RedirectStandardError = $true
                    $startprocess.RedirectStandardOutput = $true
                    $startprocess.UseShellExecute = $false
                    $startprocess.CreateNoWindow = $true
                    $process = New-Object System.Diagnostics.Process
                    $process.StartInfo = $startprocess
                    $process.Start() | Out-Null
                    $stdout = $process.StandardOutput.ReadToEnd()
                    $stderr = $process.StandardError.ReadToEnd()
                    $process.WaitForExit()
                    Write-Message -level Verbose -Message "StandardOutput: $stdout"

                    [pscustomobject]@{
                        ComputerName = $server.ComputerName
                        InstanceName = $server.ServiceName
                        SqlInstance  = $server.DomainInstanceName
                        Database     = $dbname
                        Path         = $filename
                        Elapsed      = [prettytimespan]($resultstime.Elapsed)
                    } | Select-DefaultView -ExcludeProperty ComputerName, InstanceName
                }
                catch {
                    Stop-Function -Message "SQLPackage Failure" -ErrorRecord $_ -Continue
                }

                if ($process.ExitCode -ne 0) {
                    Stop-Function -Message "Standard output - $stderr" -Continue
                }
            }
        }
    }
    end {
        Test-DbaDeprecation -DeprecatedOn "1.0.0" -EnableException:$false -Alias Export-DbaDacpac
    }
}