type Mycount struct {
    Usercount uint
}

    //  关于Gorm执行原生SQL
    // **********语句字段要小写************
    // ***********查询用db.Raw,其他用db.Exec
    // *********** 字段大小写要对应上 **************
    // *************** 注意要 defer rows.Close()
    var Mycount Mycount
    rows,_:= db.Debug().Raw("select Count(1) as Usercount from Users").Rows()
    defer rows.Close()
    for rows.Next() {
        rows.Scan(&Mycount.Usercount)
    }
    var users []User
    //   查询 执行用Scan 和Find 一样
    db=db.Raw("select uid,user_name,age from Users").Scan(&users)
    //db=db.Raw("select uid,user_name,age from Users").Find(&users)
    fmt.Println("Users",users)
    //  更新和删除.插入用 Exec
    db= db.Exec("update Users set user_name=‘def‘ where uid=?",1)
    fmt.Println("更新了",db.RowsAffected,"条数据")
    db= db.Exec("delete from Users where uid=?",2)
    fmt.Println("更新了",db.RowsAffected,"条数据")
    return  int32(Mycount.Usercount)