This guide will help you understand how to connect Spring Boot with databases like MySql and Oracle.
You will learn
- How to connect Spring Boot, JPA application with MySQL and Oracle?
- What should you configure in application.properties?
- How to setup the database schema?
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Updating the Spring Boot Project Step By Step
Let’s look at the 5 steps involved in connecting a Spring Boot application to a database.
You can use the example we created earlier for connecting to H2 in memory database as the starting point for this article- http://www.springboottutorial.com/hibernate-jpa-tutorial-with-spring-boot-starter-jpa
Step 1 - Add dependency for your database connector to pom.xml
Example for MySQL is shown below.
<dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> </dependency>
If you would want to connect to oracle database, you can use a dependency similar to the one shown below.
<dependency> <groupId>com.oracle</groupId> <artifactId>ojdbc7</artifactId> <version>188.8.131.52</version> </dependency>
Step 2 - Remove H2 Dependency from pom.xml
Or atleast make its scope as test
<!-- <dependency> <groupId>com.h2database</groupId> <artifactId>h2</artifactId> <scope>test</scope> </dependency> -->
Step 3 - Setup your My SQL Database
We would need to set up your database with a schema and the tables.
For an example, check out - https://github.com/in28minutes/jpa-with-hibernate#installing-and-setting-up-mysql
Step 4 - Configure your connection to Your Database
Configure application.properties to connect to your database.
An example for My SQL is shown below:
spring.jpa.hibernate.ddl-auto=none spring.datasource.url=jdbc:mysql://localhost:3306/todo_example spring.datasource.username=todouser spring.datasource.password=YOUR_PASSWORD
Spring Boot chooses a default value for this based on whether you are connecting to an embedded database or not.
- Embedded Databases - default create-drop
- Other Databases - default none
Here is a quick guide to all the options
- none : No action will be performed.
- create-only : Database creation will be generated from entities.
- drop : Database dropping will be generated from entities.
- create : Database dropping will be generated followed by database creation.
- validate : Validate entites with the database schema
- update : Update the database schema based on the entities
Step 5 - Restart and You are ready!
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