How do you connect a database in Spring Boot?

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In Spring Boot, connecting a database is simple because of its auto-configuration and starter dependencies. First, you add the required dependency in pom.xml (for Maven) like spring-boot-starter-data-jpa along with the database driver (e.g., MySQL, PostgreSQL). Next, configure the connection details in application.properties or application.yml file. For example:

spring.datasource.url=jdbc:mysql://localhost:3306/mydb
spring.datasource.username=root
spring.datasource.password=admin
spring.jpa.hibernate.ddl-auto=update
spring.jpa.show-sql=true

Here, url defines the database location, username and password provide credentials, and JPA properties manage schema creation and SQL logging. Spring Boot automatically creates a DataSource bean and connects to the database at runtime. You can then define Entity classes (mapping to tables) and use JPA Repositories to perform CRUD operations without writing boilerplate SQL. This integration makes database handling smooth, reduces configuration overhead, and supports multiple databases with minimal changes

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