![]() When Spring Boot detects H2 in the class path, it automatically configures a data source similar to the one shown below: The first concept you must grasp is Spring Boot Auto Configuration. Spring Boot Auto Configuration is the key! Q : How did the Spring Boot Application connect to the database H2? It expects you to set up the database and tables by default, and it uses the connection you setup. When you connect to a mysql database, Spring Boot recognises that it is a persistent database. When you communicate to an in memory database, it looks at the entities and constructs the database and tables by default. The first and most crucial fact is that Spring Boot is clever. Frequently asked questions about Spring Boot, JPA, Hibernate and H2 Q : How does H2 and Spring Boot combination work? How did all of the magic take place? In the next part, we’ll go over it question by question.When you restart the application, H2 Console will show you that the student table has been populated with the data from data.sql In most cases, simply including the H2 runtime jar in dependencies should enough. Spring Boot application and H2 require very minimal setting. H2 also has a web console for database management. H2 is compatible with a subset of the SQL standard. ![]() It may be integrated in Java programmes or used as a client-server application. H2 is a Java-based relational database management system. Spring Boot provides an excellent interaction with H2. Spring Boot has a Simple Configuration option for switching between a real database and an in memory database, such as H2.Easy to use for Learning, POCs and Unit Tests.In these situations, an in memory database is the best answer.Īs a programme starts, an in memory database is generated, and it is removed when the application is ended. You’d want to be able to run them concurrently, as various devs may be running the tests concurrently.You don’t want them to fail if the database’s data or schema changes.Utilizing a standard database incurs significant expense. Set up a data source and a bunch of extra code to connect the application to the database.Ĭase 1: Assume you need to perform a fast proof of concept.Using Oracle or mySQL databases, for example, you would need to How to connect a Spring Boot project to H2?Ī typical database requires a significant amount of setup. ![]()
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