package main

import (
	"database/sql"
	"time"
)

func cachePersistently(key string, data []byte) error {
	date, _ := toLocal(time.Now().String())
	_, err := appDbExec("insert or replace into persistent_cache(key, data, date) values(@key, @data, @date)", sql.Named("key", key), sql.Named("data", data), sql.Named("date", date))
	return err
}

func retrievePersistentCache(key string) (data []byte, err error) {
	if row, err := appDbQueryRow("select data from persistent_cache where key = @key", sql.Named("key", key)); err == sql.ErrNoRows {
		return nil, nil
	} else if err != nil {
		return nil, err
	} else {
		err = row.Scan(&data)
		return data, err
	}
}

func clearPersistentCache(pattern string) error {
	_, err := appDbExec("delete from persistent_cache where key like @pattern", sql.Named("pattern", pattern))
	return err
}