Trivial REST API returning contents of database

database.go

package main

import (
	"context"
	"database/sql"
	"encoding/json"
	_ "github.com/go-sql-driver/mysql"
	"net/http"
	. "strings"
)
import "log"

var (
	ctx context.Context
	db *sql.DB
)

func dbConn() (db *sql.DB) {
	dbDriver := "mysql"
	dbUser := "root"
	dbPass := "root"
	dbName := "hotel"
	db, err := sql.Open(dbDriver, dbUser+":"+dbPass+"@/"+dbName)
	if err != nil {
		panic(err.Error())
	}
	return db
}

type Package struct {
	Id int
	Name string
	Amount float32
	Currency string
}

func get_data() []Package {
	db := dbConn()
	rows, err := db.Query("select id,package_name,package_curr,amount from packages_v2 limit 10;")
	if err != nil {
		panic(err.Error())
	}

	var Packages = []Package{}

	for rows.Next() {
		var id int
		var name, curr string
		var amount float32
		err = rows.Scan(&id, &name, &curr, &amount)

		var pkg = Package{
			Id:       id,
			Name:     name,
			Amount:   amount,
			Currency: ToUpper(curr),
		}
		log.Print(pkg)
		Packages = append(Packages, pkg)
	}
	return Packages
}

func handleGetPackages(writer http.ResponseWriter, r *http.Request) {
	var data = get_data()
	writer.Header().Add("Content-Type", "application/json")
	json.NewEncoder(writer).Encode(data)
}

func serve() {
	http.HandleFunc("/packages", handleGetPackages)
	log.Fatal(http.ListenAndServe(":3001", nil))
}


func main() {
	log.Print("Hello world, this is package service.")
	get_data()
	serve()
}