根据用户输入的Powershell过滤JSON

问题描述

我有用逗号分隔的用户输入，并且我正在使用拆分功能来获取不同的值。我有一个API，可以返回JSON中的一些数据。我想根据用户输入从API Json过滤数据

Powershell代码

#Get Input data
$GetIds = Read-Host -Prompt 'Enter Ids:'

#Example 1,2
#If they enter 1,2,I want results data of John and Mark
#API Call Data
$json = @'
{  
    "results": [
        {
            "id": "1","name": "John",},{
             "id": "2","name": "Mark",{
             "id": "3","name": "Rachel",}
    ]
}
'@

$Obj = ConvertFrom-Json $json

#Split by comma

$userInputData = -split $GetIds 

#Filter json with $userInputData 
$FilteredData = $json | Where-Object { $_.id -eq #loop through $userInputData }

我希望过滤后的数据返回由userInput数据过滤的$ json。谢谢

解决方法

首先，如果要按逗号（,进行分隔，请使用-split operator的 binary 形式- unary 形式按仅限空白。

# Sample user input
$GetIds = '1,2'

# Split by ",",remove surrounding whitespace,convert to integers.
# For brevity,there's no error handling her,# so an empty / blank input wouldn't be interpreted as id 0,# and input such as `'1 2'` (no comma) would break.
[int[]] $userInputData = ($GetIds -split ',').Trim()

接下来，必须$Obj使用Where-Object进行过滤，即ConvertFrom-Json将您的JSON文本解析成的自定义对象图，而不是原始JSON：

$filteredData = $Obj.results | Where-Object id -in $userInputData

通过-in operator，您可以测试LHS是否属于RHS阵列。

将它们放在一起：

注意：由于在.results对象中最后一个属性后面加上逗号，我的示例JSON在技术上是无效的，我已在下面对此进行了更正。在PowerShell [Core] v6 +中，ConvertFrom-Json甚至接受无效的JSON，但在Windows PowerShell中不接受。

# Sample user input,in lieu of the Read-Host call.
$GetIds = '1,').Trim()

$Obj = ConvertFrom-Json @'
{  
    "results": [
        {
            "id": "1","name": "John"
        },{
             "id": "2","name": "Mark"
        },{
             "id": "3","name": "Rachel"
        }
    ]
}
'@

$filteredData = $Obj.results | Where-Object id -in $userInputData

# Output the matching objects
$filteredData

以上结果：

id name
-- ----
1  John
2  Mark

怎么样...

# You can split on the read
$GetIds = (Read-Host -Prompt 'Enter Ids') -split (',')
# Results
<#
1
2
#>

# Your JSON string was not valid
<#
Error: Parse error on line 4:
...     "name": "John",},{           "id": "2",----------------------^
Expecting 'STRING',got '}'
#>

# Corrected,notice the removed comma after the names 
$json = @'
{  
    "results": [
        {
            "id": "1","name": "John"           
        },"name": "Mark"  
        },"name": "Rachel"  
        }
    ]
}
'@

$Obj = $json | ConvertFrom-Json

不需要这个...

$userInputData = -split $GetIds

...由于拆分位于读取

# Filter json with $userInputData 
$Obj.results | 
Where-Object id -in $GetIds
# Results
<#
id name
-- ----
1  John
2  Mark
#>

json powershell powershell-core