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[英]Powershell: How to add null parameters in function call with Splatting
[英]Calling a powershell function, sending parameters via splatting
我有一個Powershell函數,該函數從SqlPs模塊調用“ Restore-SqlDatabase”,並通過展開將參數發送給該函數。 我試圖弄清楚為什么它沒有按我期望的那樣工作。 這是我的代碼:
$SqlParams = @{"ServerInstance"="'$ServerName'";
"Database"="'$DatabaseName'";
"BackupFile"="'$BackupFile'";}
if($Credential -ne $null) {
$SqlParams.Add("SqlCredential", $Credential)
}
if($ReplaceDatabase) {
$SqlParams.Add("ReplaceDatabase", $null)
}
try { $PathResult = Test-Path -Path $RestorePath } catch { $PathResult = $False }
if($PathResult) {
Write-Verbose "RestorePath exists, using: $RestorePath"
$RelocateData = New-Object 'Microsoft.SqlServer.Management.Smo.RelocateFile, Microsoft.SqlServer.SmoExtended, Version=11.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91'
$RelocateData.LogicalFileName = $DatabaseName
$RelocateData.PhysicalFileName = $(Join-Path -Path $RestorePath -ChildPath "$DatabaseName.mdf")
$RelocateLog = New-Object 'Microsoft.SqlServer.Management.Smo.RelocateFile, Microsoft.SqlServer.SmoExtended, Version=11.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91'
$RelocateLog.LogicalFileName = "$DatabaseName`_log"
$RelocateLog.PhysicalFileName = $(Join-Path -Path $RestorePath -ChildPath "$DatabaseName`_log.ldf")
$RelocateFile = @($RelocateData,$RelocateLog)
$SqlParams.Add("RelocateFile", $RelocateFile)
}
try{
Write-Verbose "Using the following parameters:"
$paramString = $SqlParams | Out-String
Write-Verbose $paramString
Restore-SqlDatabase @SqlParams
} catch {
Write-Error $_
Write-Output "Restore failed..."
return
}
Write-Output "Database successfully restored!"
當我運行它時,它無法連接到數據庫。 但是,當我直接在終端中使用“參數”哈希表和相同的參數值運行命令時,它的工作原理與預期的完全一樣。
對我有什么提示嗎?
這是一些秘密調味料。
在Restore-SqlDatabase
調用之前進行了此Restore-SqlDatabase
:
SQLCMD -S $ServerName -d master -Q "Alter Database [$DatabaseName] SET SINGLE_USER With ROLLBACK IMMEDIATE"
並在Restore-SqlDatabase
調用之后執行了此Restore-SqlDatabase
:
SQLCMD -S $ServerName -d master -Q "Alter Database [$DatabaseName] SET MULTI_USER WITH ROLLBACK IMMEDIATE"
現在似乎一切正常。
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