与 Get-Item 冲突

Question

我有一行代码有一些冲突，但我看不出它是什么。

这是程序

$Date = Get-Date -Format MM-dd-yyyy-HH-mm-ss-tt

<#*****SQL Session Variables*****#>
$Username = "sa"
$Password = "xyz" | ConvertTo-SecureString -asPlainText -Force
$Credentials = New-Object System.Management.Automation.PSCredential($Username,$Password)

$DatabaseNames = Invoke-SQLcmd -Query "Select * From sys.databases WHERE Name NOT LIKE '%Master%' AND Name NOT LIKE '%Tempdb%' AND Name NOT LIKE '%Model%' AND Name NOT LIKE '%Msdb%';" -ServerInstance "localhost" | Select Name -ExpandProperty Name
Write-Host "****Database Names****" -ForeGroundColor Red -BackGroundColor Black
$DatabaseNames
"`n`n"

<#****Get Database Size****#>
Push-Location
Import-Module sqlps -disablenamechecking
Invoke-Sqlcmd -Query "select name, physical_name, size * 8.0 / 1024 size from sys.master_files WHERE Type_Desc NOT LIKE '%LOG%' AND Name NOT LIKE '%Master%' AND Name NOT LIKE '%Tempdb%' AND Name NOT LIKE '%Model%' AND Name NOT LIKE '%Msdb%';" -ServerInstance "localhost" | Select @{Label="Database Name";Expression={$_.name}}, @{Label="Location";Expression={$_.physical_name}}, @{Label="SIze (MB)";Expression={$_.size}}
Pop-Location
"`n"
Start-Sleep 4

<#****Backup Databases****#>
ForEach ($DatabaseName in $DatabaseNames)
{
$SQLBackupPath1 = "C:\T2\SQlBackup\"
$SQLBackupPath2 = "$DatabaseName"
$SQLBackupPath3 = "_"
$SQLBackupPath4 = $Date
$SQLBackupPath5 = "_.bak"
$SQLBackupPath = $SQLBackupPath1 + $SQLBackupPath2 + $SQLBackupPath3 + $SQLBackupPath4 + $SQLBackupPath5
$SQLBackupPath

Backup-SQLDatabase -ServerInstance localhost -Database $DatabaseName -BackupFile $SQLBackupPath -Credential $Credentials
Write-Host "Database Backup of " -NoNewLine
Write-Host "$DatabaseName" -ForeGroundColor Red -BackGroundColor Black -NoNewLine
Write-Host " has been completed" 
"`n"
}

<#****Delete Databases****#>
ForEach ($DatabaseName in $DatabaseNames)
{
Push-Location
Import-Module sqlps -disablenamechecking
Invoke-Sqlcmd -Query "EXEC msdb.dbo.sp_delete_database_backuphistory @database_name = N'$DatabaseName';" -ServerInstance "localhost"
Invoke-Sqlcmd -Query "USE [master];" -ServerInstance "localhost"
Invoke-Sqlcmd -Query "ALTER DATABASE [$DatabaseName] SET SINGLE_USER WITH ROLLBACK IMMEDIATE;" -ServerInstance "localhost"
Invoke-Sqlcmd -Query "DROP DATABASE [$DatabaseName];" -ServerInstance "localhost"
Pop-Location
Write-Host "Database: " -NoNewLine
Write-Host "$DatabaseName" -ForeGroundColor Red -BackGroundColor Black -NoNewLine
Write-Host " has been Dropped"
"`n"
}

Get-ChildItem -Path C:\T2\SQLBackup\ | Where-Object {$_.Name -match "ApOps*" } | Sort-Object LastWriteTime -Descending

如果我将最后一行 GetChildItem 移动到第一行 $Date 下，我会得到输出。但是，如果我在循环中或它当前所在的位置使用它，则不会返回任何结果。这让我相信代码中存在一些冲突的语句。如果是这样，我似乎找不到它，而且我正在失去寻找它的想法。请帮忙。

Answer 1

您被输出格式所困扰，并且对输出有点粗心。考虑一下，我在一个包含几个文件的目录中：

列出文件，简单且工作正常：

PS D:\test> Get-ChildItem  # list the files


    Directory: D:\test

Mode                LastWriteTime         Length Name                                                                                                 
----                -------------         ------ ----                                                                                                 
-a----       02/11/2016     07:01           1640 log.txt                                                                                              
-a----       02/11/2016     07:01              0 testfile

输出一个空字符串，然后列出文件，简单而且工作正常。开头多空一行：

PS D:\test> ""; Get-ChildItem



    Directory: D:\test

Mode                LastWriteTime         Length Name                                                                                                 
----                -------------         ------ ----                                                                                                 
-a----       02/11/2016     07:01           1640 log.txt                                                                                              
-a----       02/11/2016     07:01              0 testfile

获取字符串长度，然后列出文件。等什么？输出格式化程序从它收到的第一个输出（字符串长度）中获取您要求的属性，然后将其应用于它收到的所有内容（文件），直到管道为空：

PS D:\test> "" | select Length; Get-ChildItem  # select string length, then...

Length     # missing columns ??!!
------     
     0     # string length
  1640     # file length
     0     # file length

获取一些属性不存在的文件，然后列出文件。这是相同的想法，只是这次它没有显示任何字符串或文件的任何内容，因为 Foobar 在任何一种类型上都不存在：

PS D:\test> "" | select Foobar; Get-ChildItem   # select property which doesn't exist

Foobar
------
         # ????  this is your "no output"

您正在做这种事情 - 将混合类型发送到输出管道。它们仍然会输出，如果您将它们捕获到变量中或将它们写入文件，数据就会在那里，但是试图弄清楚如何在控制台上显示它们的输出格式化程序会首先获取它并格式化输出与此相反，假设您将获得一致的输出。它获得的第一个复杂对象来自您的代码：

Invoke-Sqlcmd -Query "select name, physical_name, size * 8.0 / 1024 size from sys.master_files WHERE Type_Desc NOT LIKE '%LOG%' AND Name NOT LIKE '%Master%' AND Name NOT LIKE '%Tempdb%' AND Name NOT LIKE '%Model%' AND Name NOT LIKE '%Msdb%';" -ServerInstance "localhost" | Select @{Label="Database Name";Expression={$_.name}}, @{Label="Location";Expression={$_.physical_name}}, @{Label="SIze (MB)";Expression={$_.size}}


# where you select these properties for display:
# Database Name, Location, Size (MB)

# None of these properties exist on files or directories,
# so they don't get shown on screen.

修复：

$x = Invoke-SqlCmd ___
$y = Get-ChildItem

$x | Format-Table
$y | Format-Table

或者多用Write-Host，或者输出到文件

与 Get-Item 冲突

Conflict with Get-Item

sql

powershell

get-childitem