I want to be able to continuously poll database to select data from my table using Camel. I have configured Camel in my spring boot application. Here are the configurations that I am using
build.gradle:
implementation 'org.apache.camel:camel-jdbc-starter:2.24.0'
implementation 'org.apache.camel:camel-sql-starter:2.24.0'
RouteBuilder class:
@Component
public class CustomCamelConfig extends RouteBuilder {
Logger log = LoggerFactory.getLogger(getClass());
@Autowired
RouteDataMapper dataMapper;
@Override
public void configure() throws Exception {
from("timer://timer1?period=2s").log("Called every 2 seconds")
.setBody(constant("select * from tenders"))
.bean(dataMapper,"generateSalesData")
.noDelayer();
}
}
Bean:
@Component
public class RouteDataMapper {
Logger log = LoggerFactory.getLogger(getClass());
public void generateSalesData(String payload) {
log.info("RouteDataMapper - [generateSalesData]");
log.info("payload : {}", payload);
}
}
application.properties
spring.datasource.driver-class-name=oracle.jdbc.driver.OracleDriver
spring.datasource.url=jdbc:oracle:thin:@xxx:xxx/zzz
spring.datasource.username=zzz
spring.datasource.password=zzz
Issue I am facing is that, when I print the bean method parameter (generateSalesData(String payload)), I get the query string itself ("select * from tenders") and not the value from the table. The setBody() in configure method doesn't accept a sql:select .. statement, shows "The method setBody(Expression) in the type ProcessorDefinition is not applicable for the arguments (String)".
I am new to camel. Could anyone please let me know what is that I am missing to do.
The route you have, as written, is simply setting the body of the message to a string which happens to look like a SQL. Camel has no idea, since you haven't use the right component.
Instead of
.setBody(constant("select * from tenders"))
you need to tell Camel to use the sql component
.to("sql:select * from tenders")
The result that's passed on to RouteDataMapper will be a List<Map<String, Object>>, as described in the documentation. You'd need to adjust your method parameter accordingly.