Golang实现CRUD操作教程详解

type User struct {
    ID   int    `json:"id"`
    Name string `json:"name"`
    Age  int    `json:"age"`
}

var users = make(map[int]User)
var nextID = 1

func createUser(name string, age int) User {
    user := User{ID: nextID, Name: name, Age: age}
    users[nextID] = user
    nextID++
    return user
}

newUser := createUser("Alice", 25)
fmt.Printf("Created: %+v\n", newUser)

func getUser(id int) (User, bool) {
    user, exists := users[id]
    return user, exists
}

func getAllUsers() []User {
    list := make([]User, 0, len(users))
    for _, user := range users {
        list = append(list, user)
    }
    return list
}

func updateUser(id int, name string, age int) (User, bool) {
    user, exists := users[id]
    if !exists {
        return User{}, false
    }
    if name != "" {
        user.Name = name
    }
    if age > 0 {
        user.Age = age
    }
    users[id] = user
    return user, true
}

func deleteUser(id int) bool {
    _, exists := users[id]
    if !exists {
        return false
    }
    delete(users, id)
    return true
}