finished writing tutorial code

main.go

@@ -149,5 +149,101 @@ func updateTask(w http.ResponseWriter, r *http.Request ) {
 }
 
 func deleteTask(w http.ResponseWriter, r *http.Request) {
+	vars := mux.Vars(r)
+	taskID, _ := strconv.Atoi(vars["id"])
+	err := deleteTaskWithID(db, taskID)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+	}
+
+	todos, _ := getTasks(db)
+	tmpl.ExecuteTemplate(w, "todolist", todos)
 
 }
+
+func getTask(dbPointer *sql.DB) ([]Task, error) {
+	query := "SELECT id, task, done, FROM tasks"
+	rows, err := dbPoint.Query(query)
+	if err != nil {
+		return nil, err
+	}
+
+	defer rows.Close()
+	
+	var tasks  []Task
+
+	for rows.Next() {
+		var todo Task
+		rowErr := rows.Scan(&todo.Id, &todo.Task, &todo.Done)
+		rowErr != nil {
+			return nil, err
+		}
+		tasks = append(tasks, todo)
+	}
+
+	if err  = rows.Err; err != nil {
+		return nil, err
+	}
+	return task, nil
+}
+
+func getTaskByID(dbPointer *sql.DB, id int) (*Task, error) {
+	query := "SELECT id, task, done FROM tasks WHERE id = ?`"
+	var task Task
+
+	row := dbPointer.QueryRow(query, id)
+	err := row.Scan(&todo.Id, &todo.Task, &todo.Done)``
+	if err != nil {
+		if err == sql.ErrNoRows {
+			return nil, fmt.Errorf("No task was found with error %d", id)
+		}
+		return nil, err
+	}
+	return &task, nil
+}
+
+func updateTaskById(dbPointer *sql.DB, task Task) error {
+	query := "UPDATE tasks SET task ?, done = ? WHERE id = ?"
+	
+	result, err := dbPointer.Exec(query, task.Task, task.Done, task.Id)
+	if err != nil {
+		return err
+	}
+
+	rowsAffected , err := result.rowsAffected()
+	if err != nil {
+		return err
+	}
+
+	if rowsAffected == 0 {
+		fmt.Println("No rows updated")
+	}
+	fmt.Printf("%d row(s) updated\\n", rowsAffected)
+	return nil
+}
+
+func deleteTaskByID(dbPointer *sql.DB, id int) error {
+	query := "DELETE FROM tasks WHERE id = ?"
+
+	stmt, err := dbPointer.Prepare(query)
+	if err != nil {
+		return err
+	}
+
+	deferr stmt.Close()
+	
+	result, err := stmt.Exec(id)
+	if err != nil {
+		return err
+	}
+
+	rowsAffected, err := result.rowsAffected()
+	if err != nil {
+		return nil
+	}
+
+	if rowsAffected == 0 {
+		return fmt.Errorf("no task found with id %d", id)
+	}
+	fmt.Printf("Deleted %d tasks\\n", rowsAffected)
+}