Return studentService.getStudentById(id) creating a get mapping that retrieves the detail of a specific Student int id) creating a get mapping that retrieves all the students detail from the List getAllStudent() autowired the StudentService studentService The annotation indicates that a method parameter should be bound to the body of the web request. saveStudent(): It saves the student detail.deleteStudent(): It deletes a specific student that we have specified in the path variable.We have passed id as an argument by using the annotation The annotation indicates that a method parameter should be bound to a URI template variable. getStudent(): It returns a student detail that we have specified in the path variable.getAllStudent(): It returns a List of all Students.Mark the class as RestController by using the annotation Autowire the StudentService class by using the annotation Define the following methods:.In the StudentController class, we have done the following: We have created controller class with the name StudentController. Step 12: Create a Controller class in the package. Step 11: Create a package with the name in the folder src/main/java. mark id as primary id as column int id

mark class as an class name as Table class Student Mark the class as Entity by using the annotation Mark the class as Table name by using the annotation Define each variable as Column by using the annotation.Right-click on the file -> Source -> Generate Getters and Setters. Define four variable id, age, name, and.In the Books class, we have done the following: We have created model class with the name Student. Step 10: Create a model class in the package. Step 9: Create a package with the name in the folder src/main/java. Step 8: Import the project folder into STS.įile -> Import -> Existing Maven Projects -> Browse -> Select the folder spring-boot-h2-database-example -> Finish Step 7: Extract the Jar file and paste it into the STS workspace. When we click on the Generate button, it wraps the project in a Jar file and downloads it to the local system. Step 5: Add the dependencies Spring Web, Spring Data JPA, and H2 Database. We have provided spring-boot-h2-database-example. Step 2: Select the Spring Boot version 2.3.0.M1. Let's set up a Spring Boot application with the H2 database. In the above screenshot, we have defined our own database named javatpoint. Once we have enabled the H2 console, now we can access the H2 console in the browser by invoking the URL The following figure shows the console view of the H2 database. If we want to use H2 database in an application we need to add the following dependency in pom.xml file: It provides a web console to maintain in the database.It provides simple Configuration to switch between a real database and in-memory database.It stores data in memory, not persist the data on disk. It is a relational database management system written in Java. H2 is an embedded, open-source, and in-memory database. The widely used in-memory database is H2. It is helpful for POCs (Proof of Concepts), not for a production application.

It lost the data when the program is closed. In the case of the in-memory database, data store in the system memory. Some popular persistence databases are Oracle, MySQL, Postgres, etc. The data will be available even if the database server is bounced. The persistent database persists the data in physical memory. It creates the configuration automatically. The widely used in-memory databases are H2, HSQLDB (HyperSQL Database), and Apache Derby. The in-memory databases are volatile, by default, and all stored data loss when we restart the application. The in-memory database is an embedded database. We use the in-memory database when we do not need to persist the data.

Because memory access is faster than disk access. In-memory database relies on system memory as oppose to disk space for storage of data. Next → ← prev Spring Boot H2 Database What is the in-memory database

Java memory disk map