November 2012
Intermediate to advanced
888 pages
54h 46m
Polish
Content preview from Ruby. Receptury
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13.9. Bezpośrednia komunikacja z bazą danych MySQL
Problem
Chcemy przesyłać zapytania SQL i polecenia bezpośrednio do bazy danych MySQL.
Rozwiązanie
Czy rzeczywiście jest taka potrzeba? Niemal zawsze lepiej używać ogólnej biblioteki DBI. Najważniejszym wyjątkiem jest sytuacja, kiedy piszemy aplikację Rails i chcemy uruchomić instrukcję SQL, której nie można zaprezentować za pomocą biblioteki ActiveRecord[90].
Aby bezpośrednio komunikować się z bazą danych MySQL, można skorzystać z oprawy biblioteki klienckiej MySQL dla języka Ruby (dostępnej w postaci gemu mysql). Biblioteka ta zapewnia interfejs bardzo zbliżony do interfejsu biblioteki DBI.
Poniżej zamieszczono specyficzną dla MySQL wersję metody with_db, zdefiniowaną we wprowadzeniu ...
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