What? Clojure’s contrib wrapper for JDBC. Where? https://github.com/clojure/java.jdbc [org.clojure/java.jdbc “0.7.0-beta1”]
Summary? Adds reducible queries; Drops support for Clojure 1.4.0 (see below). Details? A new function, reducible-query, has been added that accepts a db-spec and a SQL/parameters vector, and returns a “reducible collection”. The query doesn’t actually run until you reduce it. At that point, it sets up the PreparedStatement, runs the query, and processes the ResultSet – by creating an interim “reducible collection” version of that result set and delegating your reduce operation to that. The connection is automatically closed when reduction completes, either by processing the entire result set or by returning a ‘reduced’ value. If you’re on Clojure 1.7 or later, you can therefore use reducible-query with transducers. Note that the reducible collection returned by reducible-query can be processed multiple times and the query will be run each time. There’s also a reducible-result-set helper function which will transform a ResultSet into a single-pass reducible collection if you need to drop down to that level (which you can use with the existing db-query-with-resultset function). Clojure version support? This beta release supports Clojure 1.5 forward. It implements reducible queries using CollReduce on Clojure 1.5/1.6. It implements reducible queries using IReduce on Clojure 1.7+ I’d prefer to use IReduceInit and only support Clojure 1.7+ going forward. Please provide feedback on how that might affect you: https://www.surveymonkey.com/r/MR2HRFD Thanks to? Kevin Downey for opening https://dev.clojure.org/jira/browse/JDBC-99 three years ago and Ghadi Shayban for the outline of the reducible ResultSet! Sean Corfield -- (904) 302-SEAN -- (970) FOR-SEAN An Architect's View -- http://corfield.org/ "Perfection is the enemy of the good." -- Gustave Flaubert, French realist novelist (1821-1880) -- 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.