API basica en Go lang con conexion a mySQL

API-Go-mySQL.go

package main

import (
	"database/sql"
	"encoding/json"
	"fmt"
	"log"
	"net/http"

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

	"github.com/gorilla/mux"
)

var db *sql.DB

func homeLink(w http.ResponseWriter, r *http.Request) {
	fmt.Fprintf(w, "<h1>API welcome!</h1>")
}

func sqlTest(w http.ResponseWriter, r *http.Request) {
	var err error
	db, err = sql.Open("mysql", "root:@/inventory_db?charset=utf8")
	if err != nil {
		panic(err)
	}
	rows, err := db.Query("SELECT id,username FROM stock_user")
	if err != nil {
		panic(err)
	}
	defer rows.Close()
	for rows.Next() {
		var dataDB int
		var textDB string
		rows.Scan(&dataDB, &textDB)
		fmt.Println(dataDB)
		fmt.Println(textDB)
		slcD := []string{"apple", "peach", "pear"}
		slcB, _ := json.Marshal(slcD)
		fmt.Fprintf(w, textDB)
		fmt.Fprintf(w, string(slcB))
	}
}

func main() {
	router := mux.NewRouter().StrictSlash(true)
	router.HandleFunc("/", homeLink)
	router.HandleFunc("/sqltest", sqlTest)
	log.Fatal(http.ListenAndServe(":8081", router))
}