使用Powershell将json文件中的列值替换为null答案

【问题标题】：Replace column value with null in json file using Powershell使用Powershell将json文件中的列值替换为null
【发布时间】：2021-01-19 23:49:22
【问题描述】：

这是我的 json 文件的样子：

{
    "count":  12,
    "name":  "Daily Ticket",
    "columnNames":  [
                        "User",
                        "Channel",
                        "Date",
                        "# of Closed Incidents",
                        "Open",
                        "Response",
                        "Remark",
                        "Closed"
                    ],
    "rows":  [
                    [
                     "abc",
                     "Service Web",
                     "\u00272020-06-13 00:00:00\u0027",
                     "1",
                     "0",
                     "0",
                     "this is a text,please replace with null",
                     "1"
                 ],
                 [
                     "xyz",
                     "Email",
                     "\u00272020-06-13 00:00:00\u0027",
                     "21",
                     "1",
                     "0",
                     "this is a text,please replace with null",
                     "7"
                 ]
             ]
}

我想将 Remark 列中的所有值替换为 null 并使用 powershell 转换为 csv 文件。请帮助实现这一目标。

我希望列名作为标题，行作为在 csv 中用逗号分隔的行。我的输出 csv 文件应如下所示：

User,Channel,Date,# of Closed Incidents,Open,Response,Remark,Closed
abc,Service Web,\u00272020-06-13 00:00:00\u0027,1,0,0,,1
xyz,Email,\u00272020-06-13 00:00:00\u0027,1,0,0,,1

【问题讨论】：

标签： json powershell csv

【解决方案1】：

将此 json 转换为 CSV 文件并不难。
只需加载 JSON，将其转换为对象并循环通过属性构建可以保存为 CSV 的新对象数组：

$json = Get-Content -Path 'D:\Test\DailyTicket.json' -Raw | ConvertFrom-Json
$headers = $json.columnNames

$result = foreach ($row in $json.rows) {
    # just a precaution to not run into index errors when there are 
    # more items in the array than there are headers or vice-versa
    $items = [math]::Min($row.Count, $headers.Count)
    # create a new empty (ordered) hashtable
    $hash  = [ordered]@{}
    for ($i = 0; $i -lt $items; $i++) {
        # fill the hashtable, except for iten 'Remark'
        $hash[$headers[$i]] = if ($headers[$i] -ne 'Remark') { $row[$i] } else { $null }
    }
    # If you insist on keeping the apostrophe characters in the date field in unicode format `\u0027`
    # $hash['Date'] = $hash['Date'] -replace "'", '\u0027'

    # output a PSObject to be collected in array $result
    [PsCustomObject]$hash
}

# output on screen
$result | Format-Table -AutoSize

# output to CSV file
$result | Export-Csv -Path 'D:\Test\DailyTicket.csv' -NoTypeInformation

生成的 CSV 文件：

"User","Channel","Date","# of Closed Incidents","Open","Response","Remark","Closed"
"abc","Service Web","'2020-06-13 00:00:00'","1","0","0",,"1"
"xyz","Email","'2020-06-13 00:00:00'","21","1","0",,"7"

【讨论】：