gorm使用自定义sql

func FindLazyOnlineUser() string {
    var user string
    DB.DB().QueryRow("SELECT 1 from dual").Scan(&user)
    return user
}

或者用结构体：

type LazyOnlineUser struct {
    user string
}

func FindLazyOnlineUser() (user string)  {
    var result LazyOnlineUser
    DB.Raw("SELECT user from user_info where id=1").Scan(&result)
    return result.user
}