July 2012
Beginner to intermediate
744 pages
24h 42m
Polish
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
Rozdział 4. Blokowanie złych danych
Nawet najlepszy projektant baz danych spędził bezsenną noc, martwiąc się o błędy czające się w bazie danych. Niepoprawne dane to niemiły kłopot — są umieszczane w bazie danych, tkwią w niej w ukryciu miesiącami i pojawiają się w momencie odkrycia, że faktura została wysłana do klienta „Puste Puste” albo paczkę orzeszków sprzedano za 40 zł.
Najlepszym sposobem uniknięcia tego typu problemów jest zapobieżenie wprowadzaniu złych danych do bazy. Innymi słowy, należy ustawić reguły sprawdzania poprawności (walidacji) odrzucające podejrzane wartości już w momencie ich wprowadzania. Kiedy niepoprawne dane znajdą się już w bazie danych, trudniej je znaleźć niż igłę w stogu siana.
W tym rozdziale zostanie omówiony zestaw ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.