利用 PowerShell 做 SQL 數據庫備份

#============================================================
# Backup a Database using PowerShell and SQL Server SMO
# Script below creates a full backup
# Donabel Santos
# 2010.10.16 paulus：modified
#============================================================

#specify database to backup
#ideally this will be an argument you pass in when you run
#this script, but let's simplify for now
$dbToBackup = $args[0]

#clear screen
cls

#load assemblies
#note need to load SqlServer.SmoExtended to use SMO backup in SQL Server 2008
#otherwise may get this error
#Cannot find type [Microsoft.SqlServer.Management.Smo.Backup]: make sure
#the assembly containing this type is loaded.

[System.Reflection.Assembly]::LoadWithPartialName("Microsoft.SqlServer.SMO") | Out-Null
#Need SmoExtended for smo.backup
[System.Reflection.Assembly]::LoadWithPartialName("Microsoft.SqlServer.SmoExtended") | Out-Null
[System.Reflection.Assembly]::LoadWithPartialName("Microsoft.SqlServer.ConnectionInfo") | Out-Null
[System.Reflection.Assembly]::LoadWithPartialName("Microsoft.SqlServer.SmoEnum") | Out-Null

#create a new server object
$server = New-Object ("Microsoft.SqlServer.Management.Smo.Server") "(local)"
$backupDirectory = $server.Settings.BackupDirectory

#2010.10.16 paulus: display default backup directory
"Default Backup Directory: " + $backupDirectory

#display current backup database
"Current database: " + $dbToBackup

$db = $server.Databases[$dbToBackup]
$dbName = $db.Name

$timestamp = Get-Date -format yyyyMMddHHmmss
$smoBackup = New-Object ("Microsoft.SqlServer.Management.Smo.Backup")

#BackupActionType specifies the type of backup.
#Options are Database, Files, Log
#This belongs in Microsoft.SqlServer.SmoExtended assembly

$smoBackup.Action = "Database"
$smoBackup.BackupSetDescription = "Full Backup of " + $dbName
$smoBackup.BackupSetName = $dbName + " Backup"
$smoBackup.Database = $dbName
$smoBackup.MediaDescription = "Disk"
#2010.10.16 paulus: overwrite
$smoBackup.Initialize = $TRUE
#2010.10.16 paulus: no need for timestamp
#$smoBackup.Devices.AddDevice($backupDirectory + "" + $dbName + "_" + $timestamp + ".bak", "File")
$smoBackup.Devices.AddDevice($backupDirectory + "" + $dbName + ".bak", "File")
$smoBackup.SqlBackup($server)

#let's confirm, let's list list all backup files
$directory = Get-ChildItem $backupDirectory

#list only files that end in .bak, assuming this is your convention for all backup files
$backupFilesList = $directory | where {$_.extension -eq ".bak"}
$backupFilesList | Format-Table Name, LastWriteTime