如何使用 postgresql 访问 json 数组元素（键），json 嵌套字典类型中的值？
[英]How to access json array elements (keys) , values in json nested dictionary type using postgresql?
问题描述
I have a nested structure json. How to extract the specific elements(keys) and values?
我有一个嵌套结构 json。如何提取特定元素（键）和值？
How to access " sky: selling":"1" Or "U1":"0000"?如何访问“天空：销售”：“1”或“U1”：“0000”？ I tried json_object_keys and json_array_elements for extracting the array.我尝试使用 json_object_keys 和 json_array_elements 来提取数组。 But I don't know exactly how to do this query.但我不知道如何做这个查询。 Example code:示例代码：
Table- record and column name: report表记录和列名：report
{
"PIname": {
"n1": "x1",
"n2": "x2",
"params": {
"S1": {
"code1": "y1",
"Code2": "y2",
},
"id": "2d",
"Dest": {
"Code3": "mi"
}
},
"PIDataArea": {
"m1": null,
"PInven": {
"head": {
"Code4": "Increase",
"line": "2020-01"
},
"PILine": [
{
"u1": "0000",
"u2": "0",
"u3": "1",
"modes": {
"@cID": "Sng",
"#txt": "12.21"
} },
{
"Qualify": ".0001",
"QOrder": "1",
"UPriceAmt": {
"@cID": "sng",
"#txt": "13" },
"sky:Qa": ".000",
"sky:Partcode": {
"@c1ID": "a"
},
"sky:SCode": "Ni",
"sky:PItem": {
"sky:ID": "h"
},
"sky:Forest": {
"sky:q1": [
{
"sky:selling": "1"
}
{
"sky:selling": "0"
}
]
} } }} }}
I tried lot,one example query here like, Select * from record r Where exists( select report->'sky: selling' from json_each(r.report) b where b.value->>'sky:selling' Ilike '0');我尝试了很多，这里有一个示例查询，例如 Select * 来自记录 r 哪里存在（select report->'sky: selling' from json_each(r.report) b where b.value->>'sky:selling' Ilike '0 ');
1 个解决方案
解决方案1
0 2021-10-01 12:45:52
You can use the json_path_query or jsonb_path_query function. Example to extract the element with key = "sky:selling":您可以使用json_path_query或jsonb_path_query function。使用 key = "sky:selling" 提取元素的示例：
json_path_query(r.report, $.** ? (@.key == 'sky:selling'))
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