Jsonpath 表达式取其中上一层满足某个条件的元素值
时间: 2024-04-22 19:22:26 浏览: 15
可以使用Jsonpath表达式中的过滤器来取得上一层满足某个条件的元素值。假设我们有以下JSON数据:
```
{
"store": {
"book": [
{
"category": "reference",
"author": "Nigel Rees",
"title": "Sayings of the Century",
"price": 8.95
},
{
"category": "fiction",
"author": "Evelyn Waugh",
"title": "Sword of Honour",
"price": 12.99
},
{
"category": "fiction",
"author": "Herman Melville",
"title": "Moby Dick",
"isbn": "0-553-21311-3",
"price": 8.99
},
{
"category": "fiction",
"author": "J. R. R. Tolkien",
"title": "The Lord of the Rings",
"isbn": "0-395-19395-8",
"price": 22.99
}
],
"bicycle": {
"color": "red",
"price": 19.95
}
}
}
```
如果我们想要获取所有category为fiction的book元素的上一层元素book和store,可以使用如下Jsonpath表达式:
```
$.store.book[?(@.category=="fiction")].parent
```
这个表达式的意思是:在store下的所有book元素中,找到所有category为fiction的元素,然后取得它们的上一层元素。这将返回如下结果:
```
[
{
"category": "fiction",
"author": "Evelyn Waugh",
"title": "Sword of Honour",
"price": 12.99
},
{
"category": "fiction",
"author": "Herman Melville",
"title": "Moby Dick",
"isbn": "0-553-21311-3",
"price": 8.99
},
{
"category": "fiction",
"author": "J. R. R. Tolkien",
"title": "The Lord of the Rings",
"isbn": "0-395-19395-8",
"price": 22.99
},
{
"book": [
{
"category": "reference",
"author": "Nigel Rees",
"title": "Sayings of the Century",
"price": 8.95
},
{
"category": "fiction",
"author": "Evelyn Waugh",
"title": "Sword of Honour",
"price": 12.99
},
{
"category": "fiction",
"author": "Herman Melville",
"title": "Moby Dick",
"isbn": "0-553-21311-3",
"price": 8.99
},
{
"category": "fiction",
"author": "J. R. R. Tolkien",
"title": "The Lord of the Rings",
"isbn": "0-395-19395-8",
"price": 22.99
}
],
"bicycle": {
"color": "red",
"price": 19.95
}
}
]
```
可以看到,上面的结果包含了所有满足条件的book元素的上一层元素,包括了所有的book元素和store元素。其中,最后一个元素是包含了所有book元素的对象,也就是上一层的最大元素。
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