diary/model/model.go

/// Defines objects that interact with the db

package model

import (
	"database/sql"
	"isthisnagee.com/tools/diary/db"
	"log"
)

type DiaryEntry struct {
	Id        int    `json:"id"`
	Title     string `json:"title"`
	CreatedAt int    `json:"created_at"`
	Version   int    `json:"version"`
}

type App struct {
	*db.DbCtx
}

func NewApp(db_path string) App {
	app, err := db.Init(db_path)
	if err != nil {
		log.Fatal(err.Error())
	}
	return App{app}

}

func (app *App) NewDiaryEntry(title string) *DiaryEntry {
	var diary_entry DiaryEntry

	var result, err = app.Db.Exec("INSERT INTO diary_log (title) values (?);", title)
	if err != nil {
		panic(err)
	}

	id, err := result.LastInsertId()
	if err != nil {
		panic(err)
	}

	if err := app.Db.QueryRow(
		"SELECT id, title, created_at, version FROM diary_log where id=?",
		id,
	).Scan(&diary_entry.Id, &diary_entry.Title, &diary_entry.CreatedAt, &diary_entry.Version); err != nil {
		panic(err)
	}

	return &diary_entry
}

func (app *App) GetDiaryEntry(id int) (*DiaryEntry, error) {
	var diary_entry DiaryEntry

	if err := app.Db.QueryRow(
		"SELECT id, title, created_at, version FROM diary_log where id=?",
		id,
	).Scan(&diary_entry.Id, &diary_entry.Title, &diary_entry.CreatedAt, &diary_entry.Version); err != nil {
		if err == sql.ErrNoRows {
			return nil, &NotFoundError{given_id: id}
		}
		return nil, err
	}
	return &diary_entry, nil
}

func (app *App) DeleteDiaryEntry(id int) (bool, error) {
	result, err := app.Db.Exec("DELETE FROM diary_log where id=?", id)
	if err != nil {
		return false, err
	}

	num_rows_affected, err := result.RowsAffected()
	if err != nil {
		return false, err
	}
	if num_rows_affected == 0 {
		return false, &NotFoundError{given_id: id}
	}
	return true, nil
}