{"id":98211,"date":"2019-09-16T10:00:03","date_gmt":"2019-09-16T07:00:03","guid":{"rendered":"https:\/\/www.javacodegeeks.com\/?p=98211"},"modified":"2019-09-13T13:57:35","modified_gmt":"2019-09-13T10:57:35","slug":"spring-boot-with-h2-database","status":"publish","type":"post","link":"https:\/\/www.javacodegeeks.com\/2019\/09\/spring-boot-with-h2-database.html","title":{"rendered":"Spring Boot with H2 Database"},"content":{"rendered":"

In this quick tutorial, we\u2019ll bootstrap a simple Spring Boot application backed by an in-memory H2<\/em> database. We\u2019ll use the Spring Data JPA to interact with our database.<\/p>\n

Project Setup:<\/h3>\n

Firstly, let\u2019s generate our project template using Spring Initializr:<\/a><\/p>\n

\n
\"\"<\/figure>\n<\/div>\n

On clicking the \u2018Generate the project\u2019<\/em> link, our project files will get downloaded.<\/p>\n

Now, if we look closely at the generated POM<\/em> file, we\u2019ll have below added dependencies:<\/p>\n

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<<\/code>dependency<\/code>><\/code><\/div>\n
    <\/code><<\/code>groupId<\/code>>org.springframework.boot<\/<\/code>groupId<\/code>><\/code><\/div>\n
    <\/code><<\/code>artifactId<\/code>>spring-boot-starter<\/<\/code>artifactId<\/code>><\/code><\/div>\n
<\/<\/code>dependency<\/code>><\/code><\/div>\n
<<\/code>dependency<\/code>><\/code><\/div>\n
    <\/code><<\/code>groupId<\/code>>org.springframework.boot<\/<\/code>groupId<\/code>><\/code><\/div>\n
    <\/code><<\/code>artifactId<\/code>>spring-boot-starter-test<\/<\/code>artifactId<\/code>><\/code><\/div>\n
<\/<\/code>dependency<\/code>><\/code><\/div>\n
<<\/code>dependency<\/code>><\/code><\/div>\n
    <\/code><<\/code>groupId<\/code>>org.springframework.boot<\/<\/code>groupId<\/code>><\/code><\/div>\n
    <\/code><<\/code>artifactId<\/code>>spring-boot-starter-data-jpa<\/<\/code>artifactId<\/code>><\/code><\/div>\n
<\/<\/code>dependency<\/code>><\/code><\/div>\n
<<\/code>dependency<\/code>><\/code><\/div>\n
    <\/code><<\/code>groupId<\/code>>com.h2database<\/<\/code>groupId<\/code>><\/code><\/div>\n
    <\/code><<\/code>artifactId<\/code>>h2<\/<\/code>artifactId<\/code>><\/code><\/div>\n
    <\/code><<\/code>scope<\/code>>runtime<\/<\/code>scope<\/code>><\/code><\/div>\n
<\/<\/code>dependency<\/code>><\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

H2 Default Properties:<\/h3>\n

Since we have added H2<\/em> database dependency, Spring Boot will auto-configure its related properties. The default configurations include:<\/p>\n

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spring.datasource.url=jdbc:h2:mem:testdb<\/code><\/div>\n
spring.datasource.driverClassName=org.h2.Driver<\/code><\/div>\n
spring.datasource.username=sa<\/code><\/div>\n
spring.datasource.password=<\/code><\/div>\n
spring.h2.console.enabled=<\/code>false<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

Let\u2019s override a few of these properties by defining those in our application.properties<\/em> file:

<\/div> <\/div><\/p>\n
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spring.h2.console.enabled=<\/code>true<\/code><\/div>\n
spring.h2.console.path=<\/code>\/h2<\/code><\/div>\n
spring.datasource.url=jdbc:h2:mem:university<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

Here, our database name will be a university<\/em>. We have also enabled the H2<\/em> Console and have set its context path.<\/p>\n

Defining Entities:<\/h3>\n

Now, we\u2019ll define a Student <\/em>entity:<\/p>\n

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@Entity<\/code><\/div>\n
public<\/code> class<\/code> Student {<\/code><\/div>\n
    <\/code>@Id<\/code><\/div>\n
    <\/code>@GeneratedValue<\/code>(strategy = GenerationType.AUTO)<\/code><\/div>\n
    <\/code>private<\/code> Integer id;<\/code><\/div>\n
 <\/code> <\/div>\n
    <\/code>private<\/code> String name;<\/code><\/div>\n
    <\/code> <\/div>\n
    <\/code>public<\/code> Student(String name) {<\/code><\/div>\n
        <\/code>this<\/code>.name = name;   <\/code><\/div>\n
    <\/code>}<\/code><\/div>\n
 <\/code> <\/div>\n
    <\/code>\/\/getters, setters<\/code><\/div>\n
 <\/code> <\/div>\n
    <\/code>public<\/code> String toString() {<\/code><\/div>\n
        <\/code>return<\/code> \"{id=\"<\/code> + id + <\/code>\", name=\"<\/code> + name + <\/code>\"}\"<\/code>;<\/code><\/div>\n
    <\/code>}<\/code><\/div>\n
}<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

And its corresponding Spring Data JPA repository:<\/p>\n

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@Repository<\/code><\/div>\n
public<\/code> interface<\/code> StudentRepository<\/code><\/div>\n
  <\/code>extends<\/code> CrudRepository<Student, Integer> {<\/code><\/div>\n
}<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

The Student<\/em> entity will get mapped to the database table with exactly the same name. If we want, we can specify a different table name with @Table<\/em> annotation.<\/p>\n

The Application Class:<\/h3>\n

Finally, let\u2019s implement our UniversityApplication <\/em>class:<\/p>\n

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@SpringBootApplication<\/code><\/div>\n
public<\/code> class<\/code> UniversityApplication {<\/code><\/div>\n
 <\/code> <\/div>\n
    <\/code>public<\/code> static<\/code> void<\/code> main(String[] args) {<\/code><\/div>\n
        <\/code>SpringApplication.run(UniversityApplication.<\/code>class<\/code>, args);      <\/code><\/div>\n
    <\/code>}<\/code><\/div>\n
 <\/code> <\/div>\n
    <\/code>@Bean<\/code><\/div>\n
    <\/code>public<\/code> CommandLineRunner testApp(StudentRepository repo) {<\/code><\/div>\n
        <\/code>return<\/code> args -> {<\/code><\/div>\n
            <\/code>repo.save(<\/code>new<\/code> Student(<\/code>\"James\"<\/code>));<\/code><\/div>\n
            <\/code>repo.save(<\/code>new<\/code> Student(<\/code>\"Selena\"<\/code>));<\/code><\/div>\n
 <\/code> <\/div>\n
            <\/code>List<Student> allStudents = repo.findAll();<\/code><\/div>\n
            <\/code>System.out.println(<\/code>\"All students in DB: \"<\/code> + allStudents);<\/code><\/div>\n
 <\/code> <\/div>\n
            <\/code>Student james = repo.findById(<\/code>1<\/code>);<\/code><\/div>\n
            <\/code>System.out.println(<\/code>\"James: \"<\/code> + james);<\/code><\/div>\n
        <\/code>};<\/code><\/div>\n
    <\/code>}<\/code><\/div>\n
}<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

This class is the starting point for our Spring Boot application. Here, the @SpringBootApplication<\/em> annotation is equivalent to having @ComponentScan, @EnableAutoConfiguration,<\/em> and @SpringConfiguration<\/em> together.<\/strong><\/p>\n

We have also defined an instance of CommandLineRunner<\/em><\/a>. And so, when we run our application, our console logs will have:<\/p>\n

\n
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UniversityApplication:All students in DB: [{id=<\/code>1<\/code>, name=James}<\/code><\/div>\n
 <\/code>, {id=<\/code>2<\/code>, name=Selena}]<\/code><\/div>\n
James: {id=<\/code>1<\/code>, name=James}<\/code><\/div>\n
...<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

Please note that in Spring Boot, all entities should ideally be defined at either the same package level or at lower levels(in sub-packages) to that of the main application class<\/strong>. If so, Spring Boot will auto-scan all those entities.<\/p>\n

Accessing the H2 Console:<\/h3>\n

We can also check the database entries on the H2 console.<\/p>\n

To do that, we\u2019ll open the URL: http:\/\/localhost:8080\/h2 <\/em>on any browser and use our database configurations to login. With it, we\u2019ll be able to see all our created tables and entries easily on a UI Console dashboard.<\/p>\n

Conclusion:<\/h3>\n

In this tutorial, we bootstrapped a very simple Spring Boot application with a single entity. This application is integrated with the H2 database and uses Spring Data JPA.
We can easily extend it to cater to a much wider application scope.<\/p>\n

\n\n\n\n
\n

Published on Java Code Geeks with permission by Shubhra Srivastava, partner at our JCG program<\/a>. See the original article here: Spring Boot with H2 Database<\/a><\/p>\n

Opinions expressed by Java Code Geeks contributors are their own.<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

In this quick tutorial, we\u2019ll bootstrap a simple Spring Boot application backed by an in-memory H2 database. We\u2019ll use the Spring Data JPA to interact with our database. Project Setup: Firstly, let\u2019s generate our project template using Spring Initializr: On clicking the \u2018Generate the project\u2019 link, our project files will get downloaded. Now, if we …<\/p>\n","protected":false},"author":82253,"featured_media":240,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[854],"class_list":["post-98211","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-enterprise-java","tag-spring-boot"],"yoast_head":"\nSpring Boot with H2 Database - Java Code Geeks<\/title>\n<meta name=\"description\" content=\"Interested to learn about H2 Database? 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