Can spring boot have multiple data sources?

Introduction. Spring Boot provides first-class support to the Spring JPA that makes it easy to access the database with little boilerplate code by using Spring Repositories feature. Spring Boot does not provide an out of the box solution in case our application needs multiple DataSources (e.g. multi-tenant system).

How does spring boot handle two DataSource?

Using multiple datasources with Spring Boot and Spring Data 💈 ⇄🌱 ⇄ 💈

1. Add an additional datasource configuration to your application.properties.
2. Set the SQL Dialect to “default” in your application.properties to let Spring autodetect the different SQL Dialects of each datasource.

How do you configure a DataSource in spring?

To configure your own DataSource , define a @Bean of that type in your configuration. Spring Boot reuses your DataSource anywhere one is required, including database initialization. If you need to externalize some settings, you can bind your DataSource to the environment (see “Section 25.8.

What is the difference between @qualifier and primary?

The @Primary annotation sets the bean preference and it is used with the @Bean or @Component etc stereotype annotations. On the other hand, @Qualifier is usually used with @Autowired or @Inject etc annotations.

What is difference between CrudRepository and JpaRepository?

CrudRepository mainly provides CRUD functions. PagingAndSortingRepository provides methods to do pagination and sorting records. JpaRepository provides some JPA-related methods such as flushing the persistence context and deleting records in a batch.

How does spring boot connect to external database?

Updating the Spring Boot Project Step By Step

1. Step 1 – Add dependency for your database connector to pom. xml.
2. Step 2 – Remove H2 Dependency from pom.xml. Or atleast make its scope as test.
3. Step 3 – Setup your My SQL Database.
4. Step 4 – Configure your connection to Your Database.
5. Step 5 – Restart and You are ready!

What is spring boot Autoconfigure?

Simply put, the Spring Boot autoconfiguration represents a way to automatically configure a Spring application based on the dependencies that are present on the classpath. This can make development faster and easier by eliminating the need for defining certain beans that are included in the auto-configuration classes.

What is spring boot data JPA?

Spring Boot JPA is a Java specification for managing relational data in Java applications. It allows us to access and persist data between Java object/ class and relational database. It also provides a runtime EntityManager API for processing queries and transactions on the objects against the database.

How does spring Boot create DataSource?

Spring Boot provides a very good support to create a DataSource for Database. We need not write any extra code to create a DataSource in Spring Boot. Just adding the dependencies and doing the configuration details is enough to create a DataSource and connect the Database.

How do I create a DataSource in spring boot?

To configure your own DataSource , define a @Bean of that type in your configuration. Spring Boot reuses your DataSource anywhere one is required, including database initialization. If you need to externalize some settings, you can bind your DataSource to the environment (see “Section 24.8.

What is Spring boot qualifier?

The @Qualifier annotation is used to resolve the autowiring conflict, when there are multiple beans of same type. The @Qualifier annotation can be used on any class annotated with @Component or on method annotated with @Bean . This annotation can also be applied on constructor arguments or method parameters.

What is multiple data sources configuration in Spring Boot?

Spring Boot multiple data sources configuration are advantageous to connect with different databases in a single spring boot application. Spring Boot Multiple Data Sources :

How to configure multiple data sources in spring data JPA?

To configure multiple data sources in Spring Data JPA we need to group the Model classes and Repository interfaces for each data source under different packages, this is how we tell Spring what belongs to which data source. Assuming that package names given in below example and comments itself are self explanatory.

What is hikaricp in Spring Boot 2?

Also Spring Boot 2.x uses HikariCP for connection pooling unlike Spring Boot 1.x. When we configure multiple data sources we can’t anymore specify the JPA properties like dialect and ddl.auto in the properties file, those should be included in the configuration classes separately for each data source.

How to create a Spring Boot application?

On your browser head on to https://start.spring.io and start configuring the Spring Boot project. Once you’re done with the configuration click on the Generate button and download the project. Unzip the downloaded file and open it in your favorite IDE. Then open application.properties file and add below properties.