Sample UDF which can be used to post messages to an URL.

The extension is using curl to send messages.

You need to the development package for curl and mysql installed.

sudo apt-get update && sudo apt-get install -y libmysqlclient-dev libcurl4-openssl-dev

When the needed headers and libraries are installed, make sure you update the makefile with the correct paths before building your shared library:

make SERVER=http://localhost:8080 INCLUDE="-I/usr/include/mysql -I/include/x86_64-linux-gnu/curl" LDFLAGS="-L/usr/lib/x86_64-linux-gnu"

After we have built the shared library we need to copy it into our mysql plugin directory:

cp logger.so `mysql_config --plugindir`

Now we need to tell mysql about our extension:

sudo mysql -uroot
DROP FUNCTION IF EXISTS udfLog;
CREATE FUNCTION udfLog RETURNS STRING SONAME 'logger.so';

After this you could start a server running on the same host as your mysql instance and on port 8080. You could of course use anything for this, even just using the built in php webserver:

php -S localhost:8080

and then say greet it:

SELECT udfLog("Greetings dark night!");