func (s SqlPreferenceStore) save(transaction *gorp.Transaction, preference *model.Preference) StoreResult {
	result := StoreResult{}

	preference.PreUpdate()

	if result.Err = preference.IsValid(); result.Err != nil {
		return result
	}

	params := map[string]interface{}{
		"UserId":   preference.UserId,
		"Category": preference.Category,
		"Name":     preference.Name,
		"Value":    preference.Value,
	}

	if utils.Cfg.SqlSettings.DriverName == model.DATABASE_DRIVER_MYSQL {
		if _, err := transaction.Exec(
			`INSERT INTO
				Preferences
				(UserId, Category, Name, Value)
			VALUES
				(:UserId, :Category, :Name, :Value)
			ON DUPLICATE KEY UPDATE
				Value = :Value`, params); err != nil {
			result.Err = model.NewLocAppError("SqlPreferenceStore.save", "store.sql_preference.save.updating.app_error", nil, err.Error())
		}
	} else if utils.Cfg.SqlSettings.DriverName == model.DATABASE_DRIVER_POSTGRES {
		// postgres has no way to upsert values until version 9.5 and trying inserting and then updating causes transactions to abort
		count, err := transaction.SelectInt(
			`SELECT
				count(0)
			FROM
				Preferences
			WHERE
				UserId = :UserId
				AND Category = :Category
				AND Name = :Name`, params)
		if err != nil {
			result.Err = model.NewLocAppError("SqlPreferenceStore.save", "store.sql_preference.save.updating.app_error", nil, err.Error())
			return result
		}

		if count == 1 {
			s.update(transaction, preference)
		} else {
			s.insert(transaction, preference)
		}
	} else {
		result.Err = model.NewLocAppError("SqlPreferenceStore.save", "store.sql_preference.save.missing_driver.app_error", nil,
			"Failed to update preference because of missing driver")
	}

	return result
}