Clojure-JVM上的函数式编程语言(17)数据库 作者: R. Mark Volkmann
原帖地址：http://java.ociweb.com/mark/clojure/article.html#Databases
作者：R. Mark Volkmann?
译者：RoySong
数据库??? Clojure Contrib中的sql库简化了对关系型数据库的访问，它支持事务提交回滚、预声明、创建和删除表、插入
更新删除记录和运行条件查询。下面的例子连接到一个Postgres数据库并运行了查询。注释中增加了对mysql数据库
的支持。
(use 'clojure.contrib.sql)(let [db-host "localhost" db-port 5432 ; 3306 db-name "HR"] ; The classname below must be in the classpath. (def db {:classname "org.postgresql.Driver" ; com.mysql.jdbc.Driver :subprotocol "postgresql" ; "mysql" :subname (str "//" db-host ":" db-port "/" db-name) ; Any additional map entries are passed to the driver ; as driver-specific properties. :user "mvolkmann" :password "cljfan"}) (with-connection db ; closes connection when finished (with-query-results rs ["select * from Employee"] ; closes result set when finished ; rs will be a non-lazy sequence of maps, ; one for each record in the result set. ; The keys in each map are the column names retrieved and ; their values are the column values for that result set row. (doseq [row rs] (println (row :lastname))))))??? clj-record库中提供了持久化的API，这个是从ROR的ActiveRecord库获得灵感的。要获得更多的信息，请访问
http://github.com/duelinmarkers/clj-record/tree/master。
?