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类型转换

1.interface 转 string 或则其他​

func interfaceToString(inter interface{}) {
    switch inter.(type) {

    case string:
        fmt.Println("string", inter.(string))
        break
    case int:
        fmt.Println("int", inter.(int))
        break
    case float64:
        fmt.Println("float64", inter.(float64))
        break
    }
}


// 扩展:

username := (viper.Get("mysql.username")).(string)
password := (viper.Get("mysql.password")).(string)
host := (viper.Get("mysql.host")).(string)
port := (viper.Get("mysql.port")).(int64)
database := (viper.Get("mysql.database")).(string)

2.int64 转 string​

dataSource.WriteString(strconv.FormatInt(port, 10))

2. int64 转 string​

strconv.FormatInt(port, 10)

3.int 转 string​

str:=strconv.Itoa(123) 

fmt.Println(str,reflect.TypeOf(str))

4. string 转 int​

int,err:=strconv.Atoi("123")
if err!=nil {
 panic(err)
}

fmt.Println(num,reflect.TypeOf(num))