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##备份数据库(完整备份)V2.0 Andy 2017-4-13 增加了设置压缩备份，和是否使用复制备份功能
##备份数据库(完整备份)V1.0 Andy
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[string]$serverInstance="IP\InstanceName" 
[string]$userName="Login"
[string]$password="Password"
[string]$Path="\\xxx.xxx.xxx.xxx\xxxBackup"

[string]$DBList="dbname" #(选填)数据库列表，数据库之间使用','隔开，留空表示所有数据库
[bool]$CopyOnly=$true; #为 True，仅复制备份；否则不是仅复制备份，而是平常备份序列的一部分
[int32]$CompressionOption=1 #1 启动压缩  ，2 禁用压缩






[bool]$AddBackupTime= 1 #(选填) 备份文件名是否加备份时间，格式为：_yyyyMMddHHmmss

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[System.Reflection.Assembly]::LoadWithPartialName("Microsoft.SqlServer.Smo") | Out-Null
[System.Reflection.Assembly]::LoadWithPartialName("Microsoft.SqlServer.ConnectionInfo") | Out-Null
[System.Reflection.Assembly]::LoadWithPartialName("Microsoft.SqlServer.SmoExtended") | Out-Null
[System.Reflection.Assembly]::LoadWithPartialName("System.Data") | Out-Null

[string]$DBName=""
[datetime]$StartTime=Get-Date
$Path=$Path+$(If($($Path.Split("\"))[-1] -eq "" ){""} Else {"\"})

$ServerConnection =new-object "Microsoft.SqlServer.Management.Common.ServerConnection" $serverInstance,$userName, $password 


Clear-Host #清除控制台的内容

#--------------------------------------
#检查备份数据库清单
#--------------------------------------
Function CheckDB
{
    Param([String]$DBvar)
    
    Begin 
    {
        [Boolean]$CheckResult=$false
    }
    Process
    {
        If($DBList -eq "")
        {
            $CheckResult=$true
        }
        Else
        {
            Foreach($x In $DBList.Split(","))
            {
                If($x -eq $DBvar)
                {
                    $CheckResult=$true
                    Break
                }
            }
        }
    }
    End
    {
        Return $CheckResult
    }
}

#1. 连接实例
Try
{
    $ServerConnection.Connect()
}
Catch
{    
    Write-Host "无法连接到数据库实例：$serverInstance"   -ForegroundColor Red
}

#2. 判断备份路径是否正确
[bool]$PathExists=Test-Path $Path

if ($PathExists -eq $false)
{
    Write-Host "无效的路径：$Path"   -ForegroundColor Red
}

#3. 备份数据库
if ($ServerConnection.IsOpen -and $PathExists -eq $true)
{

    Try
    {
        $Server=new-object "Microsoft.SqlServer.Management.Smo.Server" $ServerConnection
        $Backup=new-object "Microsoft.SqlServer.Management.Smo.Backup"
        
        [string]$strDate =if($AddBackupTime -eq $true){Get-Date -Format "_yyyyMMddHHmmss"}else{""}
        
        $Backup.Action=[Microsoft.SqlServer.Management.SMO.BackupActionType]::Database
        $Backup.Incremental =$false
        $Backup.CompressionOption=$CompressionOption;
        $Backup.CopyOnly=$CopyOnly;  
        
        foreach ($DB in $Server.Databases | Select-Object -Property Name,IsSystemObject | Where-Object -FilterScript {$_.IsSystemObject -eq $false})
        {
            $DBName=$DB.Name
            if (CheckDB($DBName) -eq $true ) #判断$DBName是否在备份数据库列表中
            {                
                $Backup.Database =$DBName
                $Backup.Devices.Clear()
                $Backup.Devices.AddDevice($Path+$DBName+$strDate+".bak",[Microsoft.SqlServer.Management.Smo.DeviceType]::File)
            
                $Backup.SqlBackupAsync($Server) #异步处理备份
                Write-Host "正在备份 $DBName ... ..." -BackgroundColor Blue -ForegroundColor White
                
                $Backup.Wait() #等待备份完成才继续
                Write-Host "完成备份 $DBName .      " -BackgroundColor Green    
                
            }
        }

        
        [TimeSpan]$Times = (Get-Date) - $StartTime
        [String]$Str=if($Times.Hours -eq 0){""}else{$Times.Hours.ToString()+ " 小时 "}
        $Str+=if($Times.Minutes -eq 0){""}else{$Times.Minutes.ToString()+" 分钟 "}
        $Str+=if($Times.Seconds -eq 0){""}else{$Times.Seconds.ToString()+" 秒 "}
        Write-Host "备份总耗时： $Str"
        
    }
    Catch
    {    
        Write-Error $_
        Write-Host "在备份 $DB 过程中发生错误."   -ForegroundColor Red
    }
    
}