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Click Here to SUBSCRIBE!Configuring Multiple Databases in Spring Boot
Often in real-world applications, you need to connect to more than one database. For example, your app might need to fetch employee details from one database and user credentials from another. In this guide, we'll show you how to handle multiple data sources using Spring Boot JDBC effortlessly.
1. Setting Up Your Properties
The first step is to define your database connections in the application.properties file. Instead of just one, you define two sets of credentials:
- DataSource 1: Configuration for your Organization/Employee Database.
- DataSource 2: Configuration for your User/Security Database.
2. The Configuration Class
We create a special Java class marked with @Configuration. This class is responsible for creating two Bean objects:
- DataSource Bean: Tells Spring how to connect to each database.
- JdbcTemplate Bean: An object that helps us run SQL queries. We create one specifically for each database.
3. Building Repositories
Now, you can create separate Repository classes. For instance, an EmployeeRepository will use the first JdbcTemplate, and a UserRepository will use the second. This keeps your code clean and ensures each repository talks to the correct database!
Summary of the Process
✅ Define properties for both DBs.
✅ Create separate DataSource Beans.
✅ Create separate JdbcTemplate Beans.
✅ Use @Qualifier or specific naming to inject the right template into your Repository.
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