函数版
package main
import (
"fmt"
"os"
)
var allStudent map[uint64]*student
type student struct {
id uint64
name string
}
func newStudent(id uint64, name string) *student {
return &student{
id: id,
name: name,
}
}
func addStudent() {
var name string
var id uint64
fmt.Print("请输入学生姓名:")
fmt.Scanln(&name)
fmt.Print("请输入学生ID:")
fmt.Scanln(&id)
newStu := newStudent(id, name)
allStudent[id] = newStu
fmt.Print("添加成功!,继续请回车[enter]...")
fmt.Scanln()
}
func delStudent() {
var id uint64
fmt.Print("请输入学生id:")
fmt.Scanln(&id)
if _, ok := allStudent[id]; ok {
delete(allStudent, id)
fmt.Print("删除成功")
} else {
fmt.Printf("没有该学生【%d】", id)
}
fmt.Print(",继续请回车[enter]...")
fmt.Scanln()
}
func queryStudent() {
var id uint64
fmt.Print("请输入学生id:")
fmt.Scanln(&id)
if stu, ok := allStudent[id]; ok {
fmt.Printf("%v", *stu)
} else {
fmt.Print("没有该学生")
}
fmt.Print(",继续请回车[enter]...")
fmt.Scanln()
}
func queryAllStudent() {
fmt.Println("^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^")
fmt.Println("学号\t姓名")
for k, v := range allStudent {
fmt.Printf("%d\t%v\n", k, v.name)
}
fmt.Println("vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv")
}
func main() {
allStudent = make(map[uint64]*student, 50)
for {
fmt.Println("==========================================================")
fmt.Println("0.退出\t1.增加学生\t2.删除学生\t3.查询学生\t4.查询所有")
fmt.Printf("请输入你的选择:")
var choice int8
fmt.Scanln(&choice)
fmt.Printf("你的选择是:%d\n", choice)
switch choice {
case 0:
os.Exit(1)
case 1:
addStudent()
case 2:
delStudent()
case 3:
queryStudent()
case 4:
queryAllStudent()
default:
fmt.Println("输入错误！请输入屏幕的数字")
}
}
}
面向对象(方法)
package main
import (
"fmt"
"os"
)
type person struct {
id uint64
name string
}
type student struct {
class string
person
}
type admin struct {
password string
person
}
func (a *admin) newAdmin(id uint64, name string, password string) *admin {
return &admin{
password: password,
person: person{
id: id, name: name},
}
}
func (a *admin) newStudent(id uint64, name string, class string) *student {
return &student{
person: person{
id: id, name: name},
class: class,
}
}
func (a *admin) addStudent() {
var name string
var class string
var id uint64
fmt.Print("请输入学生姓名:")
fmt.Scanln(&name)
fmt.Print("请输入学生ID:")
fmt.Scanln(&id)
fmt.Print("请输入学生班级:")
fmt.Scanln(&class)
newStu := a.newStudent(id, name, class)
allStudent[id] = newStu
fmt.Print("添加成功!,继续请回车[enter]...")
fmt.Scanln()
}
func (a *admin) delStudent() {
var id uint64
fmt.Print("请输入学生id:")
fmt.Scanln(&id)
if _, ok := allStudent[id]; ok {
delete(allStudent, id)
fmt.Print("删除成功")
} else {
fmt.Printf("没有该学生【%d】", id)
}
fmt.Print(",继续请回车[enter]...")
fmt.Scanln()
}
func queryStudent() {
var id uint64
fmt.Print("请输入学生id:")
fmt.Scanln(&id)
if stu, ok := allStudent[id]; ok {
fmt.Printf("%v", *stu)
} else {
fmt.Print("没有该学生")
}
fmt.Print(",继续请回车[enter]...")
fmt.Scanln()
}
func queryAllStudent() {
fmt.Println("^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^")
fmt.Println("\t学号\t姓名\t班级")
for k, v := range allStudent {
fmt.Printf("\t%d\t%v\t%s\n", k, v.name, v.class)
}
fmt.Println("vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv")
}
var (
allStudent map[uint64]*student
allAdmin map[uint64]*admin
)
func publicMenu() {
for {
fmt.Println("=========================欢迎回来【公共版】=========================")
fmt.Println("\t0.返回首页\t1.查询学生\t2.查询所有")
fmt.Printf("请输入你的选择:")
var choice int8
fmt.Scanln(&choice)
switch choice {
case 0:
return
case 1:
queryStudent()
case 2:
queryAllStudent()
default:
fmt.Println("输入错误！请输入屏幕的数字")
}
}
}
func adminMenu(a *admin) {
for {
fmt.Printf("=========================欢迎回来,【%#v】管理员=========================\n", a.person.name)
fmt.Println("\t0.注销登录\t1.增加学生\t2.删除学生\t3.查询学生\t4.查询所有")
fmt.Printf("请输入你的选择:")
var choice int8
fmt.Scanln(&choice)
switch choice {
case 0:
return
case 1:
a.addStudent()
case 2:
a.delStudent()
case 3:
queryStudent()
case 4:
queryAllStudent()
default:
fmt.Println("输入错误！请输入屏幕的数字")
}
}
}
func main() {
allAdmin = make(map[uint64]*admin, 10)
adminObj := admin{
person: person{
id: 1, name: "admin"}, password: "123456"}
allAdmin[1] = &adminObj
allStudent = make(map[uint64]*student, 50)
var pID uint64
var pChoice uint8
var pPassword string
for {
fmt.Println("=========================欢迎来到KNHO学生管理系统=========================")
fmt.Println("\t0.退出系统\t1.公共版面\t2.管理版面")
fmt.Print("请输入您的选择:")
fmt.Scanln(&pChoice)
switch pChoice {
case 0:
os.Exit(1)
case 1:
publicMenu()
case 2:
fmt.Print("请输入您的账户ID:")
fmt.Scanln(&pID)
//查询是否是管理员
if value, ok := allAdmin[pID]; ok {
fmt.Printf("请输入密码: ")
fmt.Scanln(&pPassword)
if allAdmin[pID].password == pPassword {
adminMenu(value) //默认成功，跳转管理员界面
} else {
fmt.Print("[logging failed] 密码错误,请核实您账户的密码! 继续请回车[enter]...")
fmt.Scanln()
}
} else {
fmt.Print("[logging failed] 账户不存在,请核实您的账户! 继续请回车[enter]...")
fmt.Scanln()
}
default:
fmt.Println("输入错误！请输入屏幕的数字")
}
}
}
细节探究
var allStudent map[uint64]student与 var allStudent map[uint64]*student的区别
使用指针将节省内存：首先需要实例化结构体(开辟内存块A)，将结构体对象存入map的value中(这过程称为拷贝\复制，需另外开辟内存块B)，一份东西放在两个地方存储。