利用Go语言开发上门做菜系统的用户评价功能有哪些优势？

package main

import (
    "fmt"
    "sync"
    "time"
)

func main() {
    var wg sync.WaitGroup

    for i := 0; i < 5; i++ {
        wg.Add(1)
        go func(id int) {
            defer wg.Done()
            time.Sleep(time.Second)
            fmt.Println("User", id, "finished rating")
        }(i)
    }

    wg.Wait()
    fmt.Println("All ratings finished")
}

package main

import (
    "errors"
    "fmt"
)

func rateUser(userId int) error {
    // 模拟评价过程
    if userId < 100 {
        return errors.New("Invalid user ID")
    }

    // 进行评价并保存

    return nil
}

func main() {
    userIds := []int{1, 2, 3, 101, 102}
    for _, userId := range userIds {
        err := rateUser(userId)
        if err != nil {
            fmt.Println("Failed to rate user with ID", userId)
        } else {
            fmt.Println("Successfully rated user with ID", userId)
        }
    }
}

package main

import (
    "database/sql"
    "fmt"
    "log"

    _ "github.com/go-sql-driver/mysql"
)

func saveRating(userId int, rating float64) error {
    db, err := sql.Open("mysql", "user:password@tcp(127.0.0.1:3306)/database")
    if err != nil {
        return err
    }
    defer db.Close()

    stmt, err := db.Prepare("INSERT INTO ratings(user_id, rating) VALUES(?, ?)")
    if err != nil {
        return err
    }
    defer stmt.Close()

    _, err = stmt.Exec(userId, rating)
    if err != nil {
        return err
    }

    return nil
}

func main() {
    err := saveRating(1, 4.5)
    if err != nil {
        log.Fatal(err)
    }

    fmt.Println("Rating saved successfully")
}