Can't connect Go to XAMPP MySQL - mysql

Question

I'm new to Go.
I'm trying to use MySQL with Go.
I have installed XAMPP which has Apache and MySQL.
I'm also using the database/sql package and github.com/go-sql-driver/mysql driver.
I can't figure out the error. I'm using LiteIDE which doesn't show any error but the record is not inserted to my database.
My code is:
// RESTAPI project main.go
package main
import (
"database/sql"
"encoding/json"
"fmt"
"log"
"net/http"
_ "github.com/go-sql-driver/mysql"
"github.com/gorilla/mux"
)
type API struct {
Message string "json:message"
}
type User struct {
ID int "json:id"
Name string "json:username"
Email string "json:email"
First string "json:first"
Last string "json:last"
}
func CreateUser(w http.ResponseWriter, r *http.Request) {
fmt.Fprintln("Create file")
NewUser := User{}
NewUser.Name = r.FormValue("user")
NewUser.Email = r.FormValue("email")
NewUser.First = r.FormValue("first")
NewUser.Last = r.FormValue("last")
output, err := json.Marshal(NewUser)
fmt.Println(string(output))
if err != nil {
fmt.Println("Something went wrong!")
}
dsn := "root:password#/dbname"
db, err := sql.Open("mysql", dsn)
sql := "INSERT INTO users set user_nickname='" + NewUser.Name + "', user_first='" + NewUser.First + "', user_last='" + NewUser.Last + "', user_email='" + NewUser.Email + "'"
q, err := db.Exec(sql)
if err != nil {
log.Fatal(err)
}
fmt.Println(q)
fmt.Println("User is created")
}
func main() {
routes := mux.NewRouter()
routes.HandleFunc("/api/user/create", CreateUser).Methods("GET")
http.ListenAndServe(":8080", nil)
}

Answer 1

As Tom mentioned, you should check for an error after sql.Open:
db, err := sql.Open("mysql", dsn)
if err != nil {
log.Fatal(err)
}
PS. Never use string concatenations in SQL.
To prevent SQL injections you should use prepared statements:
sql := "INSERT INTO users set user_nickname='?', user_first='?', user_last='?', user_email='?'"
q, err := db.Exec(sql, NewUser.Name, NewUser.First, NewUser.Last, NewUser.Email)