Golangのテンプレートエンジン(html/template)

package main

import (
	"fmt"

	"html/template"
	"myfare/uidSerial"
	"net/http"

	"gorm.io/driver/sqlite"
	"gorm.io/gorm"
	"strconv"
	"time"
)

type Ninjya struct {
	Uid  string `gorm:"primaryKey"`
	Name string
	Time int
	Stat int
}

var products []Ninjya
var ninjyaSlice []string

// implements TableName of the Tabler interface
func (Ninjya) TableName() string {
	t := time.Now()
	tableName := "tbl" + strconv.Itoa(t.Year()) + strconv.Itoa(t.YearDay())
	return tableName
}

// to get active ninjya slice
func ninjya() {
	db, err := gorm.Open(sqlite.Open("./myfare.db"), &gorm.Config{})
	if err != nil {
		panic("failed to connect database")
	}

	// Migrate the schema
	db.AutoMigrate(&Ninjya{}) // if you use Automigrate and change struct, it won't be reflected automatically

	db.Debug().Order("Time desc").Where("Stat = ?", 1).Find(&products) // SELECT * FROM where Stat = tbl*****;
	ninjyaSlice = nil
	for i, p := range products {
		ninjyaSlice = append(ninjyaSlice, p.Name)
		fmt.Println(i, p)
	}
}

func handler(w http.ResponseWriter, r *http.Request) {
	t := template.Must(template.ParseFiles("layout.html", "pageData.html"))
	// to update ninjya status
	ninjya()
	tm := time.Now().Format(time.RFC1123)
	err := t.Execute(w, map[string]interface{}{
		"Time": tm,
		"Slice": ninjyaSlice,
	})
	if err != nil {
		fmt.Fprintln(w, err)
	}
}

func wevServer() {
	mux := http.NewServeMux()
	// to include static resoureces
	mux.Handle("/resources/", http.StripPrefix("/resources/", http.FileServer(http.Dir("resources/"))))
	mux.HandleFunc("/", handler)
	server := http.Server{
		Addr:    ":8080",
		Handler: mux,
	}
	err := server.ListenAndServe()
	if err != nil {
		if err != http.ErrServerClosed {
			panic(err)
		}
	}
}

func main() {
	// to call card reader function()
	go uidSerial.SerialMain()

	// http server start
	wevServer()

}