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Persistence vs. In-memory Database The persistent database persists the data in physical memory. What is the H2 Database H2 is an embedded, open-source, and in-memory database. Advantages Zero configuration It is easy to use. It is lightweight and fast. It can be embedded in Java applications or run in the client-server mode.
H2 provides a web interface called H2 Console to see the data. You can also populate some data into student table by adding a file called data. If you are talking to an in memory db, by default, it looks at the entities and creates the database and the tables.
However, if you connect to a mysql database, Spring Boot knows that its a permanent database. By default, it expects you to set up the database, set up the tables and it uses the connection that you established. As far as H2 is concerned, as soon as Spring Boot sees H2 in the class path, it auto configures a data source similar to what you see below:. Spring Boot auto-configuration attempts to automatically configure your Spring application based on the jar dependencies that you have added.
For example, If HSQLDB is on your classpath, and you have not manually configured any database connection beans, then Spring Boot will auto-configure an in-memory database. Last Updated: October 26, Spring Boot 2. Learn to configure H2 database with Spring boot. H2 database is an in-memory database and is generally used for unit testing or POC purposes.
H2 is one of the popular in-memory databases written in Java. H2 can be embedded in Java applications or run in the client-server mode. Spring Boot provides excellent integration support for H2 using simple properties configuration. To make itself even more helpful, H2 also provides a console view to maintain and interact with the database tables and data using the GUI interface.
To use H2 in the Spring boot application, we need to add the H2 runtime jar into dependencies. The best way to add is through maven. Spring provides effortless configuration options to connect to any database using properties.
Below are the configuration properties, we shall have in application. Please note by default, spring boot configures the in-memory database connection with the username 'sa' and an empty password. If you wish to change the username and password, override them in the above properties options. By default, the in-memory databases are volatile, and all stored data will be lost when we restart the application. In this case, data is written in temporary memory, and as soon as JVM is stopped, data is flushed.
For this change the spring. H2 database connection URLs. We may want to initialize the database with some fixed schema DDL and insert default data DML into tables before the application is ready for business usecases. But if you want to use it in embedded mode, or if you just want to use the MVStore, then it may make sense to use H2.
Let me carry on the tradition. Show 2 more comments. Ahmed Ashour 4, 10 10 gold badges 31 31 silver badges 47 47 bronze badges. When you say that you use only one connection- do you mean only one user accessing the database or would it be equivalent to having it deployed on JBoss and JBoss managing it? Ossama Boughaba Ossama Boughaba 2 2 silver badges 4 4 bronze badges. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password.
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