대기업의 Go 언어 적용 시나리오 탐색

package main

import (
    "net/http"
    "fmt"
)

func handler(w http.ResponseWriter, r *http.Request) {
    fmt.Fprintf(w, "Hello, World!")
}

func main() {
    http.HandleFunc("/", handler)
    http.ListenAndServe(":8080", nil)
}

package main

import (
    "fmt"
    "time"
)

func worker(id int, jobs <-chan int, results chan<- int) {
    for j := range jobs {
        fmt.Println("Worker", id, "started job", j)
        time.Sleep(time.Second)
        results <- j * 2
        fmt.Println("Worker", id, "finished job", j)
    }
}

func main() {
    jobs := make(chan int, 100)
    results := make(chan int, 100)

    for w := 1; w <= 3; w++ {
        go worker(w, jobs, results)
    }

    for j := 1; j <= 9; j++ {
        jobs <- j
    }
    close(jobs)

    for a := 1; a <= 9; a++ {
        <-results
    }
}

package main

import (
    "fmt"
    "github.com/go-pg/pg/v10"
    "github.com/go-pg/pg/v10/orm"
)

type User struct {
    ID    int
    Name  string
    Email string
}

func main() {
    db := pg.Connect(&pg.Options{
        Addr:     ":5432",
        User:     "postgres",
        Password: "password",
        Database: "mydb",
    })
    
    defer db.Close()
    
    err := createSchema(db)
    if err != nil {
        panic(err)
    }

    user1 := &User{
        Name:  "Alice",
        Email: "alice@example.com",
    }
    err = db.Insert(user1)
    if err != nil {
        panic(err)
    }

    var user User
    err = db.Model(&user).Where("name = ?", "Alice").Select()
    if err != nil {
        panic(err)
    }

    fmt.Println(user)
}

func createSchema(db *pg.DB) error {
    models := []interface{}{(*User)(nil)}
    for _, model := range models {
        err := db.Model(model).CreateTable(&orm.CreateTableOptions{
            Temp: false,
        })
        if err != nil {
            return err
        }
    }
    return nil
}