Camel route to read data from H2 DB in Spring boot app - spring-boot

Question

My spring boot app is using route to read from mySQL DB.
from("sql:select * from Students?repeatCount=1").convertBodyTo(String.class)
.to("file:outbox");
Now I want to create route to read from in memory H2 DB but Im not sure which camel components to use and how to create the route.

Answer 1

If you got Spring Boot, then you can actually inject everything via the dataSource=#mysql parameter and introduce separate DataSource-Beans and use the required ones:
#Configuration
public class DataSourceConfig {
#Bean(name = "mysqlProperties")
#ConfigurationProperties("spring.datasource.mysql")
public DataSourceProperties mysqlDataSourceProperties() {
return new DataSourceProperties();
}
#Bean(name = "mysql")
public DataSource mysqlDataSource(#Qualifier("mysqlProperties") DataSourceProperties properties) {
return properties
.initializeDataSourceBuilder()
.build();
}
#Bean(name = "h2Properties")
#ConfigurationProperties("spring.datasource.h2")
public DataSourceProperties h2DataSourceProperties() {
return new DataSourceProperties();
}
#Bean(name = "h2")
public DataSource h2DataSource(#Qualifier("h2Properties") DataSourceProperties properties) {
return properties
.initializeDataSourceBuilder()
.build();
}
}
Afterwards you can declare the different DataSources in you application.yml but don't forget to disable/exclude the datasource autoconfig.
spring:
autoconfigure:
exclude:
- org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration
datasource:
mysql:
url: jdbc:mysql://localhost:3306/db_example
username: user
password: pass
driver-class-name: com.mysql.cj.jdbc.Driver
h2:
url: jdbc:h2:mem:h2testdb
username: sa
password: sa
driver-class-name: org.h2.Driver
Your Camel-Route should look like this to use everything properly:
from("sql:select * from Students?repeatCount=1&dataSource=#mysql")
.convertBodyTo(String.class)
.to("file:outbox");