I need help on this Golang web application using mysql as database - mysql

Question

I am new to Golang and had been following some tutorials and I want to put into practice what I have learned to create a website
This is the main.go file
package main
import (
"html/template"
"net/http"
"log"
"database/sql"
_"github.com/go-sql-driver/mysql"
)
//Fetch all templates
var templates, templatesErr = template.ParseGlob("templates/*")
func main() {
PORT := ":9000"
log.Println("Listening to port", PORT)
http.HandleFunc("/", root)
http.HandleFunc("/facilities", allFacilities)
http.ListenAndServe(PORT, nil)
}
func root(w http.ResponseWriter, r *http.Request) {
rootData := make(map[string]string)
rootData["page_title"] = "iSpace Open Data"
rootData["body"] = ""
templates.ExecuteTemplate(w, "index.html", rootData)
}
type facility struct{
FacilityName string
Type string
}
func allFacilities(w http.ResponseWriter, r *http.Request){
db, err := sql.Open("mysql", "root:08swanzy#tcp(127.0.0.1:3306)/iod")
if err !=nil{
log.Fatal(err)
}
defer db.Close()
rows, err := db.Query("Select FacilityName, Type from health_facilities ")
if err != nil {
log.Fatal(err)
}
defer rows.Close()
fac := facility{}
facilities := []facility{}
for rows.Next(){
var FacilityName, Type string
rows.Scan(&FacilityName, &Type)
fac.FacilityName= FacilityName
fac.Type= Type
facilities = append(facilities, fac)
}
templates.ExecuteTemplate(w, "facilities.html", facilities)
}
This uses html files in templates folder for the view. But I keep on getting runtime error saying it has pointer dereference. I need help please.

Answer 1

Tried your code and got the same error. It happened on this line:
templates.ExecuteTemplate(w, "index.html", rootData)
The problem is that your templates are not loaded correctly. I moved template parsing to the main function and it works. Here the relevant code snippet:
//Fetch all templates
var (
templates *template.Template
)
func main() {
var err error
templates, err = template.ParseGlob("templates/*")
if err != nil {
panic(err)
}
PORT := ":9000"
log.Println("Listening to port", PORT)
http.HandleFunc("/", root)
http.HandleFunc("/facilities", allFacilities)
http.ListenAndServe(PORT, nil)
}