Mule 数据编织转换

Question

我有以下 json 作为我的输入负载，我想获取组名为 b 的组值。如何在数据编织中做到这一点？

[
  {
    "groupName": "a",
    "groupvalue": "1234"
  },
  {
    "groupName": "b",
    "groupvalue": "7890"
  }
]

Answer 1

如果您完全确定数组中只有一个元素的groupName等于"b":

%dw 2.0
output application/json
---
(payload filter ($.groupName == "b") map ( $.groupvalue)) [0]

根据您的输入，我得到以下输出：

"7890"

Answer 2

如果 groupName“b”有多个键值对，此代码将为您提供 groupName“b”s 的组值数组。

%dw 2.0
output application/json
---
(payload filter ((item, index) -> item.groupName == "b"))["groupvalue"]

例如：

    payload = [
  {
    "groupName": "a",
    "groupvalue": "1234"
  },
  {
    "groupName": "b",
    "groupvalue": "7890"
  },
  {
    "groupName": "b",
    "groupvalue": "8330"
  }
]

您将获得：

[
  "7890",
  "8330"
]

Answer 3

如果 groupName“b”有多个键值对，此代码将为您提供 groupName“b”s 的组值数组。

%dw 2.0
output application/json
---
(payload filter $.groupName =="b").*groupvalue

示例：-

payload = [
  {
    "groupName": "a",
    "groupvalue": "1234"
  },
  {
    "groupName": "b",
    "groupvalue": "7890"
  },
  {
    "groupName": "b",
    "groupvalue": "8330",
    "groupvalue": "1234"
  }
]

示例 2

payload = [
  {
    "groupName": "a",
    "groupvalue": "1234"
  },
  {
    "groupName": "b",
    "groupvalue": "7890"
  },
  {
    "groupName": "b",
    "groupvalue": "8330"
  }
]

脚本：-

%dw 2.0
output application/json
---
(payload filter $.groupName =="b")..groupvalue

Mule 数据编织转换

Mule dataweave transformation

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