Cant save SQL output to a File in Apache Camel - apache-camel

Question

I been trying this camel-sql example to fetch some rows from the back-end oracle.
Datasource definition:
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<property name="driverClassName" value="oracle.jdbc.driver.OracleDriver"/>
<property name="url" value="jdbc:oracle:thin:#localhost:port:sid"/>
<property name="username" value="username"/>
<property name="password" value="password"/>
</bean>
Routes Definition:
<route id="QueryTable">
<from uri="timer:foo?period=5s"/>
<to uri="sql:{{sql.selectOrder}}"/>
<to uri="file:target/data/?fileName=data.txt"/>
</route>
It seems to fetch the row properly, but, does not create the file and reports the following exceptions. Any help would be highly appreciated.
at org.apache.camel.impl.converter.BaseTypeConverterRegistry.mandatoryConvertTo(BaseTypeConverterRegistry.java:198)
at org.apache.camel.impl.MessageSupport.getMandatoryBody(MessageSupport.java:105)
... 16 more

Answer 1

http://camel.apache.org/sql-component.html
For select operations, the result is an instance of List<Map<String, Object>> type, as returned by the JdbcTemplate.queryForList() method.
You received List<Map<String, Object>> as result of the query. If you like to save this results to file, you have to split list by records (use splitter), convert one record to string (maybe you can use some sort of template, or just join to string fields values) and save (append) this string to file.

Answer 2

Thanks for the kind help. Here is what I used to save the resultSet to a file.
<from uri="timer:foo?repeatCount=1" />
<to uri="sql:{{sql.selectOrder}}"/>
<marshal>
<csv delimiter="|" />
</marshal>
<to uri="file://target/test.csv?fileName=data.txt" />
And of course, pom.xml has to have the following dependency added.
<dependency>
<groupId>org.apache.camel</groupId>
<artifactId>camel-csv</artifactId>
</dependency>