update: create sql handler

bot/db/postgres.go

@@ -0,0 +1,22 @@
+package db
+
+import (
+	"database/sql"
+	"log"
+	"os"
+
+	_ "github.com/lib/pq"
+)
+
+func (db SqlHandler) Connect() {
+	conn, err := sql.Open("postgres", os.Getenv("POSTGRES_DATABASE_URL"))
+	if err != nil {
+		panic(err)
+	}
+	log.Println("Connected to database!")
+	db.Conn = conn
+}
+
+func (db SqlHandler) Close() {
+	db.Conn.Close()
+}

bot/db/sql.go

@@ -0,0 +1,20 @@
+package db
+
+import "database/sql"
+
+var DB SqlHandler
+
+type SqlHandlerInterface interface {
+	Connect()
+	Close()
+	Query(string)
+}
+
+type SqlHandler struct {
+	SqlHandlerInterface
+	Conn *sql.DB
+}
+
+func (db SqlHandler) Query(query string) {
+	db.Conn.Query(query)
+}

bot/server.go

@@ -21,7 +21,7 @@ func main() {
 	}
 
 	// Connect to database
-	db.Psql = db.Connect()
+	db.DB.Connect()
 
 	// Get channel secret and channel token from environment variables
 	channelSecret := os.Getenv("LINE_CHANNEL_SECRET")