November 2012
Intermediate to advanced
888 pages
54h 46m
Polish
Content preview from Ruby. Receptury
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13.10. Bezpośrednia komunikacja z bazą danych PostgreSQL
Problem
Chcemy przesyłać zapytania SQL i polecenia bezpośrednio do bazy danych PostgreSQL.
Rozwiązanie
Podobnie jak w przypadku poprzedniej receptury dotyczącej bazy danych MySQL, należy zapytać samego siebie, czy rzeczywiście istnieje taka potrzeba. Zazwyczaj z powodzeniem można skorzystać z biblioteki DBI. Tak jak poprzednio, wyjatkiem jest sytuacja, w której trzeba skorzystać z niskopoziomowych wywołań SQL z poziomu aplikacji Rails.
Dostępne są dwa interfejsy API umożliwiające komunikację z bazą danych PostgreSQL. Obydwa są dostępne w postaci gemów. Gem postgres daje dostęp do oprawy biblioteki klienta PostgreSQL w języku C dla języka Ruby, natomiast gem postgres-pr jest interfejsem ...
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