This is a simple JDBC demo of the Oracle Database Change Notification feature, implemented in Clojure using clojure.java.jdbc and other auxiliary packages.
It's a more or less direct convertion of the online Java DCN examples, and it's not likely to be very "idiomatic" since my knowledge of Clojure is superficial at best.
After passing some command line arguments (used to establish the database connection) this program will wait for notification and simply print the notification event to standard output.
Download from https://github.com/fsmunoz/oradcn-demo, the demo uses leiningen so should be trivial.
One import point is that the ojdbc6.jar file (the Oracle Thin JDBC driver) is not distributed as part of this demo and must be obtained from Oracle (or a locally installed copy used). The location of the jar must be changed in the project.clj file.
For development Oracle 11.2 XE was used, including the built-in demo tables.
Simply launch it via lein as per the example below
Switches Default Desc -------- ------- ---- -h, --host Database host -p, --port 1521 The port to connect to -u, --user Username -p, --password Password -s, --sid Database -l, --local-port 6666 The local port that will be used for the callback -q, --query select * from DEMO_CUSTOMERS The query used for registration -h, --no-help, --help false Show help
$ lein run -- --user fsmunoz --password p4ss --db XE --host aixdev --local-port 7777 -q "select ENAME from EMP" > Connecting... connected. > Registered Tables: [FSMUNOZ.EMP] > DCN Registration ID: 701 > Waiting for DCN events... Connection information : local=192.168.122.1/192.168.122.1:7777, remote=aixdev/192.168.122.179:54157 Registration ID : 701 Notification version : 1 Event type : QUERYCHANGE Database name : XE Query Change Description (length=1) query ID=82, query change event type=QUERYCHANGE Table Change Description (length=1): operation=[UPDATE], tableName=FSMUNOZ.EMP, objectNumber=20043 ^C $
Copyright © 2013 Frederico Munoz firstname.lastname@example.org
Distributed under the Eclipse Public License, the same as Clojure.