golang数据库更新不存在的条目
问题描述：
I have a function to update a database entry as follows. The logic is that updating a non-exisitng entry returns error. Somehow I find the code a bit verbose on error handling. Is there a better way to do this? Thanks.
func (adb *AppDB) UpdateTicket(t Ticket) error {
result, err := adb.db.NamedExec(`UPDATE ticket SET detail=:detail, start_time=:start_time, end_time=:end_time, priority=:priority WHERE id=:id;`, &t)
if err != nil {
return err
}
nRows, err := result.RowsAffected()
if err != nil {
return err
}
if nRows == 0 {
return fmt.Errorf("Ticket:%s does not exist for update", t)
}
return nil
}
答
If you need to make it less verbose and easy to maintain I would highly recomend using ORM. You may try https://github.com/jinzhu/gorm
Named return might make it less verbose, but this is not a best practise for lot of scenarios
func (adb *AppDB) UpdateTicket(t Ticket) (err error) {
var result ResultType
var nRows int
if result, err = adb.db.NamedExec(`UPDATE ticket SET detail=:detail, start_time=:start_time, end_time=:end_time, priority=:priority WHERE id=:id;`, &t); err != nil {
return
}
if nRows, err = result.RowsAffected(); err != nil {
return
}
if nRows == 0 {
err = fmt.Errorf("Ticket:%s does not exist for update", t)
}
return
}