golang实战--客户信息管理系统

总计架构图：

model/customer.go

package model

import (
    "fmt"
)

type Customer struct {
    Id     int
    Name   string
    Gender string
    Age    int
    Phone  string
    Email  string
}

func NewCustomer(id int, name string, gender string, age int, phone string, email string) Customer {
    return Customer{
        Id:     id,
        Name:   name,
        Gender: gender,
        Age:    age,
        Phone:  phone,
        Email:  email,
    }
}    

func NewCustomer2(name string, gender string, age int, phone string, email string) Customer {
    return Customer{
        Name:   name,
        Gender: gender,
        Age:    age,
        Phone:  phone,
        Email:  email,
    }
}

func (c Customer) GetInfo() string {
    info := fmt.Sprintf("%v\t%v\t%v\t%v\t%v\t%v\t", c.Id, c.Name, c.Gender, c.Age, c.Phone, c.Email)
    return info
}

service/customerService.go

package service

import (
    "go_code/project_6/model"
)

//增删查改
type CustomerService struct {
    customers  []model.Customer
    customerId int
}

func NewCustomerService() *CustomerService {
    customerService := &CustomerService{}
    customerService.customerId =
    customer := model.NewCustomer(, "张三", "男", , "", "347688971@qq.com")
    customerService.customers = append(customerService.customers, customer)
    return customerService
}

func (cs *CustomerService) List() []model.Customer {
    return cs.customers
}

func (cs *CustomerService) Add(customer model.Customer) bool {
    //确定一个添加id的规则，就是添加的顺序
    cs.customerId++
    customer.Id = cs.customerId
    cs.customers = append(cs.customers, customer)
    return true
}

//根据Id查找客户在切片中的对应下标，如果没有则返回-1
func (cs *CustomerService) FindById(id int) int {
    index := -
    for i := ; i < len(cs.customers); i++ {
        if cs.customers[i].Id == id {
            //找到了
            index = i
        }
    }
    return index
}

//根据Id删除客户
func (cs *CustomerService) Delete(id int) bool {
    index := cs.FindById(id)
    if index == - {
        return false
    }
    //从切片中删除元素
    cs.customers = append(cs.customers[:index], cs.customers[index+:]...)
    return true
}

func (cs *CustomerService) GetinfoById(id int) model.Customer {
    i := id -
    return cs.customers[i]
}

//根据id修改客户信息
func (cs *CustomerService) Update(id int, customer model.Customer) bool {
    for i := ; i < len(cs.customers); i++ {
        if cs.customers[i].Id == id {
            cs.customers[i].Name = customer.Name
            cs.customers[i].Gender = customer.Gender
            cs.customers[i].Age = customer.Age
            cs.customers[i].Phone = customer.Phone
            cs.customers[i].Email = customer.Email
        }
    }
    return true
}

view/customerView.go

package main

import (
    "fmt"
    "go_code/project_6/model"
    "go_code/project_6/service"
)

type customerView struct {
    //定义必要的字段
    key             string //接受用户输入
    loop            bool   //用于循环判断
    customerService *service.CustomerService
}

func (cv *customerView) mainMenu() {
    for {
        fmt.Println("------------------客户信息管理软件---------------------")
        fmt.Println("                    1.添加客户")
        fmt.Println("                    2.修改客户")
        fmt.Println("                    3.删除客户")
        fmt.Println("                    4.客户列表")
        fmt.Println("                    5.退   出")
        fmt.Print("请选择1-5：")
        fmt.Scanln(&cv.key)
        switch cv.key {
        case "":
            cv.add()
        case "":
            cv.update()
        case "":
            cv.delete()
        case "":
            cv.list()
        case "":
            cv.logout()
        default:
            fmt.Println("你的输入有误，请重新输入")
        }
        if !cv.loop {
            break
        }
    }
    fmt.Println("你已退出了客户关系管理系统。。。")
}

func (cv *customerView) list() {
    //首先获取当前客户所有信息
    customers := cv.customerService.List()
    fmt.Println("--------------------客户列表--------------------------")
    fmt.Println("编号\t姓名\t性别\t年龄\t电话\t\t邮箱")
    for i := ; i < len(customers); i++ {
        fmt.Println(customers[i].GetInfo())
    }
    fmt.Println("------------------客户列表完成------------------------")
}

func (cv *customerView) add() {
    fmt.Println("--------------------添加客户--------------------------")
    fmt.Print("姓名：")
    name := ""
    fmt.Scanln(&name)
    fmt.Print("性别：")
    gender := ""
    fmt.Scanln(&gender)
    fmt.Print("年龄：")
    age :=
    fmt.Scanln(&age)
    fmt.Print("电话：")
    phone := ""
    fmt.Scanln(&phone)
    fmt.Print("邮箱：")
    email := ""
    fmt.Scanln(&email)
    customer := model.NewCustomer2(name, gender, age, phone, email)
    if cv.customerService.Add(customer) {
        fmt.Println("--------------------添加成功--------------------------")
    } else {
        fmt.Println("--------------------添加失败--------------------------")
    }

    fmt.Println("--------------------添加完成--------------------------")
}

func (cv *customerView) delete() {
    fmt.Println("--------------------删除客户--------------------------")
    fmt.Println("请选择要删除客户的客户编号（-1退出）：")
    id := -
    fmt.Scanln(&id)
    if id == - {
        return
    }
    fmt.Println("确认是否删除？y/n")
    choice := ""
    fmt.Scanln(&choice)
    if choice == "y" || choice == "n" {
        if cv.customerService.Delete(id) {
            fmt.Println("--------------------删除完成--------------------------")
        } else {
            fmt.Println("-----------------输入id不存在，请重新输入--------------")
        }
    }

}

func (cv *customerView) update() {
    fmt.Print("请输入要修改的id：")
    id :=
    fmt.Scanln(&id)
    if cv.customerService.FindById(id) != - {
        customer := cv.customerService.GetinfoById(id)
        fmt.Printf("姓名（%v：）", customer.Name)
        name := ""
        fmt.Scanln(&name)
        fmt.Printf("性别（%v）：", customer.Gender)
        gender := ""
        fmt.Scanln(&gender)
        fmt.Printf("年龄（%v）：", customer.Age)
        age :=
        fmt.Scanln(&age)
        fmt.Printf("电话（%v）：", customer.Phone)
        phone := ""
        fmt.Scanln(&phone)
        fmt.Printf("邮箱（%v）：", customer.Email)
        email := ""
        fmt.Scanln(&email)
        customer2 := model.NewCustomer2(name, gender, age, phone, email)
        cv.customerService.Update(id, customer2)
    } else {
        fmt.Println("-----------------输入id不存在，请重新输入--------------")
    }
}

func (cv *customerView) logout() {
    fmt.Println("确认是否退出？y/n")
    for {
        fmt.Scanln(&cv.key)
        if cv.key == "y" || cv.key == "n" {
            break
        }
        fmt.Println("你的输入有误，请从新输入")
    }
    if cv.key == "y" {
        cv.loop = false
    }
}

func main() {
    var cv customerView
    cv.loop = true
    cv.customerService = service.NewCustomerService()
    cv.mainMenu()
}

由于代码都比较基础，就不一一介绍了，很容易看懂。我们运行程序：

先选择4：我们已经初始化了一条数据。

再选择1添加一条数据：

再选择4查看一下：

数据确实已经添加成功，我们再选择3，删除一条数据：

再查看一下：

确实已经删除，然后我们选择2修改数据：

再查看一下：

已经修改了，最后我们选择5进行退出：

总结：通过golang实现的客户信息管理系统。学习一门语言最好的方式就是通过一个实际的例子。通过这个实例，不仅可以进一步巩固golang的相关基础技能，同时，也能让我们加强自己的逻辑能力，从一步步的调用函数，掌握参数传递和接收技巧。