Hi Walter, thanks for the quick reply.
Now, what does the other side of the call look like, where does the caller of "get-user" get the database component from? That's what I don't get. Thanks, Torsten. Am Sonntag, 15. März 2015 16:51:51 UTC+1 schrieb Walter van der Laan: > > Hi, > > This is an example from http://github.com/stuartsierra/component > > (defn get-user [database username] > (execute-query (:connection database) > "SELECT * FROM users WHERE username = ?" > username)) > > > Here 'database' is a component which is passed to 'get-user' as an > argument. The component can be used just like any other hashmap, so > (:connection database) gets the database connection. > > On Sunday, March 15, 2015 at 4:20:35 PM UTC+1, Torsten Uhlmann wrote: >> >> Hi, >> >> I'm tapping my toes in component land and I think I lack some conceptual >> understanding, probably done too much OO. >> Please forgive me if this is a stupid question (and I get a feel that it >> is)... >> >> Suppose I create a Lifecycle component with some state, say, a database >> component that creates a connection on calling "start". >> That connection is assoc'ed into the component map. >> >> Now, how do I access the database component map when I want to call >> functions that use the connection? >> These functions are defined outside the defrecord of the component, how >> do they get access to the map? >> >> I could access the system var (the one that holds the system for >> development purposes) or save it into an atom, but I don't really think >> that would be a good approach? >> >> Thanks, >> Torsten. >> > -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups "Clojure" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
