functions/Export-DbaScript.ps1

Function Export-DbaScript {
    <#
    .SYNOPSIS
    Exports scripts from SQL Management Objects (SMO)
 
    .DESCRIPTION
    Exports scripts from SQL Management Objects
 
    .PARAMETER InputObject
    A SQL Managment Object such as the one returned from Get-DbaLogin
         
    .PARAMETER Path
    The output filename and location. If no path is specified, one will be created. If the file already exists, the output will be appended.
         
    .PARAMETER Encoding
    Specifies the file encoding. The default is UTF8.
         
    Valid values are:
 
    -- ASCII: Uses the encoding for the ASCII (7-bit) character set.
 
    -- BigEndianUnicode: Encodes in UTF-16 format using the big-endian byte order.
 
    -- Byte: Encodes a set of characters into a sequence of bytes.
 
    -- String: Uses the encoding type for a string.
 
    -- Unicode: Encodes in UTF-16 format using the little-endian byte order.
 
    -- UTF7: Encodes in UTF-7 format.
 
    -- UTF8: Encodes in UTF-8 format.
 
    -- Unknown: The encoding type is unknown or invalid. The data can be treated as binary.
 
    .PARAMETER Passthru
    Output script to console
     
    .PARAMETER ScriptingOptionsObject
    An SMO Scripting Object that can be used to customize the output - see New-DbaScriptingOption
 
    .PARAMETER WhatIf
    Shows what would happen if the command were to run. No actions are actually performed
 
    .PARAMETER NoClobber
    Do not overwrite file
 
    .PARAMETER Append
    Append to file
 
    .PARAMETER Confirm
    Prompts you for confirmation before executing any changing operations within the command
 
    .PARAMETER Silent
    Use this switch to disable any kind of verbose messages
 
    .NOTES
    Tags: Migration, Backup, Export
     
    Website: https://dbatools.io
    Copyright: (C) Chrissy LeMaire, clemaire@gmail.com
    License: GNU GPL v3 https://opensource.org/licenses/GPL-3.0
 
    .LINK
    https://dbatools.io/Export-DbaScript
     
    .EXAMPLE
    Get-DbaAgentJob -SqlInstance sql2016 | Export-DbaScript
     
    Exports all jobs on the SQL Server sql2016 instance using a trusted connection - automatically determines filename as .\sql2016-Job-Export-date.sql
 
    .EXAMPLE
    Get-DbaAgentJob -SqlInstance sql2016 | Export-DbaScript -Path C:\temp\export.sql -Append
     
    Exports all jobs on the SQL Server sql2016 instance using a trusted connection - Will append the output to the file C:\temp\export.sql if it already exists
     
    .EXAMPLE
    Get-DbaAgentJob -SqlInstance sql2016 -Job syspolicy_purge_history, 'Hourly Log Backups' -SqlCredential (Get-Credential sqladmin) | Export-DbaScript -Path C:\temp\export.sql
         
    Exports only syspolicy_purge_history and 'Hourly Log Backups' to C:temp\export.sql and uses the SQL login "sqladmin" to login to sql2016
     
    .EXAMPLE
    Get-DbaAgentJob -SqlInstance sql2014 | Export-DbaJob -Passthru | ForEach-Object { $_.Replace('sql2014','sql2016') } | Set-Content -Path C:\temp\export.sql
         
    Exports jobs and replaces all instances of the servername "sql2014" with "sql2016" then writes to C:\temp\export.sql
     
    .EXAMPLE
    $options = New-DbaScriptingOption
    $options.ScriptDrops = $false
    $options.WithDependencies = $true
    Get-DbaAgentJob -SqlInstance sql2016 | Export-DbaScript -ScriptingOptionsObject $options
     
    Exports Agent Jobs with the Scripting Options ScriptDrops set to $false and WithDependencies set to $true.
 
    #>

    
    [CmdletBinding(SupportsShouldProcess = $true)]
    param (
        [parameter(Mandatory = $true, ValueFromPipeline = $true)]
        [object[]]$InputObject,
        [Alias("ScriptingOptionObject")]
        [Microsoft.SqlServer.Management.Smo.ScriptingOptions]$ScriptingOptionsObject,
        [string]$Path,
        [ValidateSet('ASCII', 'BigEndianUnicode', 'Byte', 'String', 'Unicode', 'UTF7', 'UTF8', 'Unknown')]
        [string]$Encoding = 'UTF8',
        [switch]$Passthru,
            [switch]$NoClobber,
        [switch]$Append,
        [switch]$Silent
    )
    
    begin {
        $executinguser = [Security.Principal.WindowsIdentity]::GetCurrent().Name
        $commandname = $MyInvocation.MyCommand.Name
        $timenow = (Get-Date -uformat "%m%d%Y%H%M%S")
        $prefixarray = @()
    }
    
    process {
        foreach ($object in $inputobject) {

            $typename = $object.GetType().ToString()
            
            if ($typename.StartsWith('Microsoft.SqlServer.')) {
                $shortype = $typename.Split(".")[-1]
            }
            else {
                Stop-Function -Message "InputObject is of type $typename which is not a SQL Management Object. Only SMO objects are supported." -Silent $Silent -Category InvalidData -Continue -Target $object
            }
            
            if ($shortype -in "LinkedServer", "Credential", "Login") {
                Write-Message -Level Warning -Message "Support for $shortype is limited at this time. No passwords, hashed or otherwise, will be exported if they exist."
            }
            
            # Just gotta add the stuff that Nic Cain added to his script
            
            if ($shortype -eq "Configuration") {
                Write-Message -Level Warning -Message "Support for $shortype is limited at this time."
            }
            
            # Find the server object to pass on to the function
            $parent = $object.parent
            
            do {
                if ($parent.urn.type -ne "Server") {
                    $parent = $parent.parent
                }
            }
            until (($parent.urn.type -eq "Server") -or (-not $parent))
            
            if (-not $parent) {
                Stop-Function -Message "Failed to find valid SMO server object in input: $object." -Silent $Silent -Category InvalidData -Continue -Target $object
            }
            
            $server = $parent
            $servername = $server.name.replace('\', '$')

            if ($ScriptingOptionsObject) {
                $scripter = New-Object Microsoft.SqlServer.Management.Smo.Scripter "$($server.name)" 
                $scripter.Options = $ScriptingOptionsObject
            }
            
            if (!$passthru) {
                if ($path) {
                    $actualpath = $path
                }
                else {
                    $actualpath = "$servername-$shortype-Export-$timenow.sql"
                }
            }
            
            $prefix = "
/*
    Created by $executinguser using dbatools $commandname for objects on $servername at $(Get-Date)
    See https://dbatools.io/$commandname for more information
*/"

            
            if ($passthru) {
                $prefix | Out-String
            }
            else {
                if ($prefixarray -notcontains $actualpath) {
                    
                    if ((Test-Path -Path $actualpath) -and $NoClobber){
                        Stop-Function -Message "File already exists. If you want to overwrite it remove the -NoClobber parameter. If you want to append data, please Use -Append parameter." -Silent $Silent -Continue -Target $actualpath
                    }
                    #Only at the first output we use the passed variables Append & NoClobber. For this execution the next ones need to buse -Append
                    $prefix | Out-File -FilePath $actualpath -Encoding $encoding -Append:$Append -NoClobber:$NoClobber
                    $prefixarray += $actualpath
                }
            }
            
            If ($Pscmdlet.ShouldProcess($env:computername, "Exporting $object from $server to $actualpath")) {
                Write-Message -Level Verbose -Message "Exporting $object"

            
                if ($passthru) {

                    if ($ScriptingOptionsObject) {
                        foreach ($script in $scripter.EnumScript($object)) {
                            $script | Out-String
                        }
                    }
                    else {
                        $object.Script() | Out-String
                    }
                }
                else {
                    if ($ScriptingOptionsObject) {
                        foreach ($script in $scripter.EnumScript($object)) {
                            $script | Out-File -FilePath $actualpath -Encoding $encoding -Append
                        }
                    }
                    else {
                        $object.Script() | Out-File -FilePath $actualpath -Encoding $encoding -Append
                    }
                }
            }
            
            if (!$passthru) {
                Write-Message -Level Output -Message "Exported $object on $server to $actualpath"
            }
        }
    }
}