Go 言語の多様な応用分野を探る: Go がどのようなプロジェクト開発に使用できるか知っていますか?

package main

import (
    "fmt"
    "net"
)

func handleConnection(conn net.Conn) {
    buffer := make([]byte, 1024)
    length, err := conn.Read(buffer)
    if err != nil {
        fmt.Println("Error reading:", err.Error())
        return
    }
    fmt.Println("Received message:", string(buffer[:length]))
    conn.Write([]byte("Message received."))
    conn.Close()
}

func main() {
    listener, err := net.Listen("tcp", ":8080")
    if err != nil {
        fmt.Println("Error listening:", err.Error())
        return
    }

    for {
        conn, err := listener.Accept()
        if err != nil {
            fmt.Println("Error accepting:", err.Error())
            return
        }
        go handleConnection(conn)
    }
}

package main

import (
    "fmt"
    "time"
)

func producer(queue chan<- int) {
    for i := 0; i < 10; i++ {
        queue <- i
        fmt.Println("Produced:", i)
        time.Sleep(time.Second)
    }
    close(queue)
}

func consumer(queue <-chan int) {
    for num := range queue {
        fmt.Println("Consumed:", num)
        time.Sleep(time.Second)
    }
}

func main() {
    queue := make(chan int)
    go producer(queue)
    consumer(queue)
}

package main

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

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

func main() {
    db, err := sql.Open("mysql", "username:password@tcp(127.0.0.1:3306)/database")
    if err != nil {
        log.Fatal(err)
    }
    defer db.Close()

    rows, err := db.Query("SELECT id, name FROM users")
    if err != nil {
        log.Fatal(err)
    }
    defer rows.Close()

    for rows.Next() {
        var id int
        var name string
        err := rows.Scan(&id, &name)
        if err != nil {
            log.Fatal(err)
        }
        fmt.Println(id, name)
    }

    err = rows.Err()
    if err != nil {
        log.Fatal(err)
    }
}

package main

import (
    "github.com/gin-gonic/gin"
)

func main() {
    r := gin.Default()

    r.GET("/", func(c *gin.Context) {
        c.JSON(200, gin.H{
            "message": "Hello World!",
        })
    })

    r.Run(":8080")
}