反射是运行时,需要在运行时解析类型信息,编译期无法优化这些操作,因此比编译时已知类型信息的直接调用效率要低。
package mainimport ("fmt""reflect""strings"
)type Person struct {Name string `json:"name" gorm:"column:name"`Age int `json:"age" gorm:"column:age"`
}func Parse(p interface{}) {tp := reflect.TypeOf(p)tv := reflect.ValueOf(p)if tp.Kind() == reflect.Pointer {tp = tp.Elem()tv = tv.Elem()}for i := 0; i < tp.NumField(); i++ {field := tp.Field(i)name := field.Namevalue := tv.FieldByName(name).Interface()var column stringtag := field.Tag.Get("gorm")parts := strings.Split(tag, ":")if len(parts) == 2 {column = parts[1]}fmt.Printf("变量名:%s 值:%v 数据库字段名:%s\n", name, value, column)}
}func main() {p0 := &Person{Name: "Jackie",Age: 20,}Parse(p0)p1 := Person{Name: "Avalanche",Age: 30,}Parse(p1)
}