Improve database connection

.env.example

@@ -1,4 +1,4 @@
-DATABASE_HOST=
-DATABASE_USER=
-DATABASE_PASSWORD=
-DATABASE_NAME=
+DATABASE_HOST="127.0.0.1:3306"
+DATABASE_USER="test"
+DATABASE_PASSWORD="test"
+DATABASE_NAME="test"

Database/utils.go

@@ -2,24 +2,22 @@ package database
 
 import (
 	"database/sql"
-	"fmt"
 	"log"
 	"os"
 
+	"github.com/go-sql-driver/mysql"
 	_ "github.com/go-sql-driver/mysql"
 )
 
-func dsn() string {
-	user := os.Getenv("DATABASE_USER")
-	password := os.Getenv("DATABASE_PASSWORD")
-	host := os.Getenv("DATABASE_HOST")
-	port := os.Getenv("DATABASE_PORT")
-	name := os.Getenv("DATABASE_NAME")
-	return fmt.Sprintf("%s:%s@tcp(%s:%s)/%s", user, password, host, port, name)
-}
-
 func GetDatabaseConnection() *sql.DB {
-	DB_conn, err := sql.Open("mysql", dsn())
+	cfg := mysql.Config{
+		User:   os.Getenv("DATABASE_USER"),
+		Passwd: os.Getenv("DATABASE_PASSWORD"),
+		Net:    "tcp",
+		Addr:   os.Getenv("DATABASE_HOST"),
+		DBName: os.Getenv("DATABASE_NAME"),
+	}
+	DB_conn, err := sql.Open("mysql", cfg.FormatDSN())
 	if err != nil {
 		log.Println("Database connection error : ", err)
 	}