如何在Golang中实现动态字段值更新

package main

import (
    "fmt"
    "reflect"
)

type User struct {
    Name string
    Age  int
}

func SetField(obj interface{}, fieldName string, value interface{}) error {
    v := reflect.ValueOf(obj)
    if v.Kind() != reflect.Ptr || v.Elem().Kind() != reflect.Struct {
        return fmt.Errorf("obj must be a pointer to struct")
    }

    field := v.Elem().FieldByName(fieldName)
    if !field.IsValid() {
        return fmt.Errorf("field %s not found", fieldName)
    }

    if !field.CanSet() {
        return fmt.Errorf("field %s cannot be set", fieldName)
    }

    val := reflect.ValueOf(value)
    if field.Type() != val.Type() {
        return fmt.Errorf("provided value type doesn't match field type")
    }

    field.Set(val)
    return nil
}

func main() {
    user := &User{Name: "Alice", Age: 25}
    SetField(user, "Name", "Bob")
    SetField(user, "Age", 30)
    fmt.Printf("%+v\n", user) // &{Name:Bob Age:30}
}

data := map[string]interface{}{
    "Name": "Charlie",
    "Age":  35,
}
for k, v := range data {
    SetField(user, k, v)
}