使用 powershell 从 json 中提取值

Question

我有以下 json

{
    "clusterName": "IBDCluster", 
    "defaultReplicaSet": {
        "name": "default", 
        "primary": "X92SL224XXX2XX:3306", 
        "ssl": "REQUIRED", 
        "status": "OK_NO_TOLERANCE", 
        "statusText": "Cluster is NOT tolerant to any failures. 1 member is not active.", 
        "topology": {
            "X92SL224XXX1XX:3306": {
                "address": "X92SL224XXXXXXX:3306", 
                "memberRole": "SECONDARY", 
                "mode": "R/O", 
                "readReplicas": {}, 
                "role": "HA", 
                "status": "ONLINE", 
                "version": "5.7.36"
            }, 
            "X92SL224XXX2XX:3306": {
                "address": "X92SL224XXX2XX:3306", 
                "memberRole": "PRIMARY", 
                "mode": "R/W", 
                "readReplicas": {}, 
                "role": "HA", 
                "status": "ONLINE", 
                "version": "5.7.36"
            }, 
            "X92SL224XXXX3XX:3306": {
                "address": "X92SL224XXX3XX:3306", 
                "instanceErrors": [
                    "ERROR: group_replication has stopped with an error."
                ], 
                "memberRole": "SECONDARY", 
                "memberState": "ERROR", 
                "mode": "R/O", 
                "readReplicas": {}, 
                "role": "HA", 
                "status": "(MISSING)", 
                "version": "5.7.36"
            }
        }, 
        "topologyMode": "Single-Primary"
    }, 
    "groupInformationSourceMember": "X92SL224XXXXXXX:3306"
}

我需要从 topology 部分提取 memberRole、status 等值。

当我转到拓扑部分时

$ClusterDetails = $ClusterStatus.defaultReplicaSet.topology

$ClusterDetails 的值类似于（数据仅对 2 个服务器可见，但所有 3 个服务器都存在）

PS C:\Windows\system32> $ClusterDetails

X92SL224XXXX1XX:3306                                                                                                   X92SL224XXXX2XX:3306                              
--------------------                                                                                                   --------------------                              
@{address=X92SL224XXXX1XX:3306; memberRole=SECONDARY; mode=R/O; readReplicas=; role=HA; status=ONLINE; version=5.7.36} @{address=X92SL224XXXX2XX:3306; memberRole=PRIM...

来自 shell 如果我 select 喜欢

我可以看到单独的输出

PS C:\Windows\system32> $ClusterDetails.'X92SL224XXXX1XX:3306'


address      : X92SL224XXXX1XX:3306
memberRole   : PRIMARY
mode         : R/W
readReplicas : 
role         : HA
status       : ONLINE
version      : 5.7.36

我需要帮助从 $ClusterDetails 获取上述各个服务器的数据，但不知道如何通过脚本获取该点部分。请告诉我该怎么做。

Answer 1

相当长的声明，但这应该有效：

$json.defaultReplicaSet.topology.PSObject.Properties.Value | Select-Object memberRole, status

# Results in:

memberRole status
---------- ------
SECONDARY  ONLINE
PRIMARY    ONLINE
SECONDARY  (MISSING)

您可以访问 Object 的每个属性的 Values在 $json.defaultReplicaSet.topology 中访问 PSObject 属性。

值得注意的是，由于 Member-Access Enumeration.

，.PSObject.Properties.Value 可以一次枚举所有 属性值

同样可以使用循环来完成，例如：

foreach($property in $json.defaultReplicaSet.topology.PSObject.Properties) {
    [pscustomobject]@{
        ThisProperty = $property.Name
        memberRole   = $property.Value.memberRole
        status       = $property.Value.status
    }
}

使用 powershell 从 json 中提取值

Extract value from json using powershell

powershell