如何在for循环PowerShell中使用数组

Question

您好我正在使用ps脚本备份sql数据库，但我有3 for for循环备份3数据库是否有一种方法，我有1个for循环，它采取我声明的3个变量并进行备份。这是我的代码

加载程序集

[System.Reflection.Assembly]::LoadWithPartialName("Microsoft.SqlServer.SMO") | Out-Null
[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

$server = New-Object ("Microsoft.SqlServer.Management.Smo.Server") "(local)"


 $bkdir = "C:\_DBbackups" #We define the folder path as a variable 
 $test1 = 'admin'
 $test2 = 'contacts'
 $test3 = 'humanResource'
 $dbs = $server.Databases



  foreach ($db in $dbs) 
  {


   if($db.Name -like $test1) 
    {
    $dbname = $db.Name
    $dt = get-date -format yyyyMMddHHmmss #We use this to create a file name based on the 
    timestamp
    $dbBackup = new-object ("Microsoft.SqlServer.Management.Smo.Backup")
    $dbBackup.Action = "Database"
    $dbBackup.Database = $dbname
    $dbBackup.Devices.AddDevice($bkdir + "\" + $dbname + "_db_" + $dt + ".bak", "File")
    $dbBackup.SqlBackup($server) 
    write-host "Database backup is successful for"$dbname 
    write-host "New Backup file is"$dbname"_db_"$dt".bak" 
    write-host "New Backup Location is" $bkdir

    }

    }

我是否也可以使用像这样的单个if语句来完成此任务

      if($db.Name -like $test1) or ($db.Name -like $test2) or ($db.Name -like  
      $test3) 
      {
        $dbname = $db.Name
        $dt = get-date -format yyyyMMddHHmmss 
        $dbBackup = new-object ("Microsoft.SqlServer.Management.Smo.Backup")
        $dbBackup.Action = "Database"
        $dbBackup.Database = $dbname
        $dbBackup.Devices.AddDevice($bkdir + "\" + $dbname + "_db_" + $dt + ".bak", "File")
        $dbBackup.SqlBackup($server) 
        write-host "Database backup is successful for"$dbname 
        write-host "New Backup file is"$dbname"_db_"$dt".bak" 
        write-host "New Backup Location is" $bkdir
     }

Answer 1

你可以试试这个;

$array = @("admin", "contacts", "humanResource")
foreach ($element in $array) {
 foreach ($db in $dbs) 
   {

    if($db.Name -like $element) 
    {
    $dbname = $db.Name
    $dt = get-date -format yyyyMMddHHmmss #We use this to create a file name based on the 
    timestamp
    $dbBackup = new-object ("Microsoft.SqlServer.Management.Smo.Backup")
    $dbBackup.Action = "Database"
    $dbBackup.Database = $dbname
    $dbBackup.Devices.AddDevice($bkdir + "\" + $dbname + "_db_" + $dt + ".bak", "File")
    $dbBackup.SqlBackup($server) 
    write-host "Database backup is successful for "$dbname 
    write-host "New Backup file is "$dbname"_db_"$dt".bak" 
    write-host "New Backup Location is " $bkdir

    }
   }
  }