How to create multiple database connections for different databases in java

Question

I have an application which uses four databases in different geographical locations. All the databases contains same tables and only the database name is different according

Answer 1

The Ideal way to achieve this is by using a multi-dimensional system like OLAP. But see if you can create a view out of those databases. Then you just need to query the view (i.e. just a single database connection). Also you can still use multiple database connections if you want.