How to access two SQl server in springboot - sql-server

Question

have an application that runs Spring MVC.
I need it to access 2 different databases in my app (Two Sql servers).
How do I configure this?

Answer 1

You can access the first database with an EntityManager and use a JdbcTemplate to access the second database
1.application.properties
#SQL Server 1
spring.datasource.url = [url]
spring.datasource.username = [username]
spring.datasource.password = [password]
spring.datasource.driverClassName = [sql Server Driver class name]
#SQl Server 2
spring.secondaryDatasource.url = [url]
spring.secondaryDatasource.username = [username]
spring.secondaryDatasource.password = [password]
spring.secondaryDatasource.driverClassName = [sql Server Driver class name]
2.Create #Configuration class and declare two datasource beans.Create a Jbc template to use to access sql server 2
#Bean
#Primary
#ConfigurationProperties(prefix="spring.datasource")
public DataSource primaryDataSource() {
return DataSourceBuilder.create().build();
}
#Bean
#ConfigurationProperties(prefix="spring.secondaryDatasource")
public DataSource secondaryDataSource() {
return DataSourceBuilder.create().build();
}
#Bean
public JdbcTemplate jdbcTemplate() {
return new JdbcTemplate(secondaryDataSource());
}
Usage Example
#Repository
public class CustomerRepositoryImpl implements CustomerRepository {
private final JdbcTemplate jdbcTemplate;
public CustomerRepositoryImpl(JdbcTemplate jdbcTemplate) {
this.jdbcTemplate = jdbcTemplate;
}
}
You can also look at the documentation:
https://docs.spring.io/spring-boot/docs/1.2.3.RELEASE/reference/htmlsingle/#howto-use-two-entity-managers
and this site
https://www.baeldung.com/spring-data-jpa-multiple-databases