JDBC Driver
The MySQL JDBC driver is one of the ones included with the dcm4chee distributions. Feel free to update it if you need/want to.
Create the database
Initiate the pacsdb database instance using the DDL in dcm4chee-mysql-2.13.6/sql/create.mysql.
Adjust DB configuration if necessary
The database configuration information is contained within dcm4chee-mysql-2.13.6/server/default/deploy/pacs-mysql-ds.xml. If you're using a different database name, user name, etc., you'll need to update this file.