Question

我正在尝试的东西是使用哈希表数组（来自数据库的用户信息）过滤csv文件（恰好是一个博客）。

#$data is from a database. (about 500 items) Type: System.Data.DataTable
$users = @()
foreach($row in $data)
{
    $userItem = @{
        LoginId = $row[0]
        LastName = $row[3]
        FirstName = $row[4]
        LastAccess = $null
    }
    $users += $userItem
}
#Log files are about 14,000 lines long
$logfiles = Get-ChildItem $logFolder -Recurse | where {$_.Extension -eq ".log"} | Sort-Object BaseName -Descending
foreach($log in $logfiles)
{
    $csvLog = Import-Csv $log.FullName -Header ("Blank","LoginId","Date")
    $u = $users | Select {&_.LoginId}
    $filteredcsvLog = $cvsLog | Where-Object { $u -contains $_.LoginId}
    #This returns null
    ....

}

这似乎不起作用，我错过了什么。我的猜测是我需要将数组展平为[string []]，但我似乎也不能这样做。

Answer 1

我不是做一个哈希表数组，而是做一个自定义对象的哈希表，例如：

$users = @{}
foreach($row in $data)
{
    $userItem = new-object psobject -property @{
        LoginId = $row[0]
        LastName = $row[3]
        FirstName = $row[4]
        LastAccess = $null
    }
    $users[$userItem.LoginId] = $userItem
}

然后过滤更容易，更快：

foreach($log in $logfiles)
{
    $csvLog = Import-Csv $log.FullName -Header ("Blank","LoginId","Date")
    $filteredcsvLog = $cvsLog | Where-Object { $users[$_.LoginId} }
    ....
}

按哈希表数组过滤csv文件

1 个答案: