How to connect to PostgreSQL in Spring Boot 2 using a Bean - spring-boot

Question

I would like to connect to PostgreSQL using a bean (#Bean) and Spring Data.
At this bean, I would like to use my own customer properties in application.properties file, like these properties below
my.db.user=postgres
my.db.password=root
my.db.url=jdbc:postgresql://localhost:5432/mydb
I can't use use default properties (spring.datasource.url , spring.datasource.username, etc .. )

Answer 1

Spring Boot 2 by default uses Hikari to manager connections.
So, you can do it.
import com.zaxxer.hikari.HikariDataSource;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.jdbc.DataSourceBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
#Configuration
public class DatabaseConfig {
#Bean
#Primary
#ConfigurationProperties("spring.datasource")
public HikariDataSource dataSource() {
return DataSourceBuilder.create()
.type(HikariDataSource.class)
.build();
}
}
application.properties
spring.datasource.platform=postgres
spring.datasource.jdbc-url=jdbc:postgresql://localhost:5432/dbname
spring.datasource.username=postgres
spring.datasource.password=123456
If you wanna use tomcat-jdbc, add the following config.
spring.datasource.type=org.apache.tomcat.jdbc.pool.DataSource
Reference link : https://github.com/spring-projects/spring-boot/wiki/Spring-Boot-2.0.0-M2-Release-Notes#default-connection-pool

Answer 2

You can create your own DataSource with your custom database properties the following way.
#Bean
#ConfigurationProperties(prefix="my.db")
public DataSource myDataSource() {
return DataSourceBuilder.create().build();
}
Have a look at the following description to configure two databases for a full example, this explains how you can use your own properties
two databases example