Update Data to MySQL Database in Golang

package main

import (
    "database/sql"
    "fmt"
)

type Student struct {
    Id   int64
    Name string
    Age  int
}

func ConnectDB() (db *sql.DB, err error) {
    dbDriver := "mysql"
    dbUser := "root"
    dbPass := "nilpointer.net"
    dbName := "nilpointer_db"
    db, err = sql.Open(dbDriver, dbUser+":"+dbPass+"@/"+dbName)
    return
}

func main() {

    db, err := ConnectDB()
    if err != nil {
        fmt.Println(err)
    } else {
        student := Student{
            Id:   2,
            Name: "Name 1",
            Age:  20,
        }
        result, err2 := db.Exec("update student set name = ?, age = ? where id = ?", student.Name, student.Age, student.Id)
        if err2 != nil {
            fmt.Println("Failed")
        } else {
            rowsAffected, _ := result.RowsAffected()
            fmt.Println("Rows Affected:", rowsAffected)
        }
    }
}