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

As you have not tagged your question with any of this, hibernate, JPA, ORM, I assume you are dealing with plain JDBC.

Having said that, I suggest you to have a DAO layer to deal with underlying databases, and leave the connection details to specific implementations. You can configure your connection strings in some .properties files, lets say.

[Complement]

You can also make use of DAO factory, an implementation of Abstract Factory or Factory Method pattern, whichever suits here.

[Links]

• A very fine implementation of DAO and DAO Factory, by BalusC
• Core J2EE Patterns -- arguably dated but might provide some idea.