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如何获取在go中具有reflect的映射接口的值?

go
  •  3
  • Bob van Luijt  · 技术社区  · 6 年前

    我正在努力在Go中获取接口映射的价值。

    val := reflect.ValueOf(Schema)
    fmt.Println("VALUE = ", val)
    fmt.Println("KIND = ", val.Kind())
    if val.Kind() == reflect.Map {
        fmt.Println("len = ", val.Len())
        for key, element := range val.MapKeys() {
            fmt.Println(key, element) // how to get the value?
        }
    }
    

    此输出:

    VALUE =  map[testString:foobar testInt:1 testBoolean:true testNumber:1 testDateTime:2017-10-06 08:15:30 +0100 +0100]
    KIND =  map
    len =  5
    0 testString
    1 testInt
    2 testBoolean
    3 testNumber
    4 testDateTime
    

    我的问题 :
    如何获取地图项的类型和值?

    1 回复  |  直到 6 年前
        1
  •  4
  •   jmaloney    6 年前

    MapKeys MapIndex

    package main
    
    import (
        "fmt"
        "reflect"
    )
    
    func main() {
        Schema := map[string]interface{}{}
        Schema["int"] = 10
        Schema["string"] = "this is a string"
        Schema["bool"] = false
    
        val := reflect.ValueOf(Schema)
        fmt.Println("VALUE = ", val)
        fmt.Println("KIND = ", val.Kind())
    
        if val.Kind() == reflect.Map {
            for _, e := range val.MapKeys() {
                v := val.MapIndex(e)
                switch t := v.Interface().(type) {
                case int:
                    fmt.Println(e, t)
                case string:
                    fmt.Println(e, t)
                case bool:
                    fmt.Println(e, t)
                default:
                    fmt.Println("not found")
    
                }
            }
        }
    }
    

    VALUE =  map[int:10 string:this is a string bool:false]
    KIND =  map
    int 10
    string this is a string
    bool false