[英]What Go tag should be used while defining struct of a JSON data if "field/key" for some values is varying or not known?
在尝试解析时间序列数据时,我发现 JSON 数据中的一个关键字段是时间戳(显然是字符串格式)。 但是不可能事先为相同的结构创建一个结构,因为无论如何我都不知道时间戳字符串。
这是 JSON 的样子:
"Time Series (5min)": {
"2020-01-17 16:00:00": {
"1. open": "167.2000",
"2. high": "167.3400",
"3. low": "167.0100",
"4. close": "167.0500",
"5. volume": "1646699"
},
"2020-01-17 15:55:00": {
"1. open": "166.9000",
"2. high": "167.1600",
"3. low": "166.8500",
"4. close": "167.1500",
"5. volume": "622999"
},
"2020-01-17 15:50:00": {
"1. open": "166.7241",
"2. high": "166.9200",
"3. low": "166.7200",
"4. close": "166.8999",
"5. volume": "271723"
}
}
有些人的结构可能如下所示:
type TIMESTAMP struct {
Open string `json:"1. open"`
High string `json:"2. high"`
Low string `json:"3. low"`
Close string `json:"4. close"`
Volumn string `json:"5. volumn"`
}
type TIMESERIES struct {
TimeStamp TIMESTAMP `json:""` //DON'T KNOW HOW TO IMPLEMENT THIS
}
遇到这样的情况怎么办? 是否有相同的 Go struct 标签?
像2020-01-17 16:00:00
这样的键似乎是动态生成的并且不是固定的,因此您可以将map
用于这样的任意键
package main
import (
"fmt"
"encoding/json"
)
type TIMESTAMP struct {
Open string `json:"1. open"`
High string `json:"2. high"`
Low string `json:"3. low"`
Close string `json:"4. close"`
Volumn string `json:"5. volumn"`
}
type TIMESERIES map[string]map[string]TIMESTAMP
func main() {
test := []byte(`{
"Time Series (5min)": {
"2020-01-17 16:00:00": {
"1. open": "167.2000",
"2. high": "167.3400",
"3. low": "167.0100",
"4. close": "167.0500",
"5. volume": "1646699"
},
"2020-01-17 15:55:00": {
"1. open": "166.9000",
"2. high": "167.1600",
"3. low": "166.8500",
"4. close": "167.1500",
"5. volume": "622999"
},
"2020-01-17 15:50:00": {
"1. open": "166.7241",
"2. high": "166.9200",
"3. low": "166.7200",
"4. close": "166.8999",
"5. volume": "271723"
}
}
}`)
var response TIMESERIES
if err := json.Unmarshal(test, &response); err != nil {
fmt.Println(err)
return
}
fmt.Printf("%+v", response)
}
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