Spring JdbcCursorItemReader in spring batch application - spring

Question

My use case is as follows:
There is an Employee table and columns are as follows:
employee_id;
empoyee_dob;
employee_lastName;
employee_firstName;
employee_zipCode
Now there is an use-case to build a list of Employees present in Dept 'A' and zipcode 11223 and also employees present in Dept B and zipcode 33445.
I have configured a spring job as follows:
<batch:job id="EmployeeDetailsJob" job-repository="EmpDaoRepository">
<batch:step id="loadEmployeeDetails" >
<batch:tasklet transaction-manager="EmployeeDAOTranManager">
<batch:chunk reader="EmpDaoJdbcCursorItemReader" writer="EmpDaoWriter" commit-interval="200" skip-limit="100">
<batch:skippable-exception-classes>
</batch:skippable-exception-classes>
</batch:chunk>
<batch:listeners>
<batch:listener ref="EmpDaoStepListener" />
</batch:listeners>
<batch:transaction-attributes isolation="DEFAULT" propagation="REQUIRED" timeout="300" />
</batch:tasklet>
</batch:step>
</batch:job>
The configuration of reader is as follows:
<bean id="EmpDaoJdbcCursorItemReader" class="EmpDaoJdbcCursorItemReader">
<property name="dataSource" ref="EmpDataSource" />
<property name="sql">
<value><![CDATA[select * from Employee where employee_id=? and employee_zipCode=? ]]>
</value>
</property>
<property name="fetchSize" value="100"></property>
<property name="rowMapper" ref="EmployeeMapper" />
</bean>
There is class EmployeeQueryCriteria which has two fields employee_id and employee_zipCode.
In on of the steps i will create an ArrayList of EmployeeQueryCriteria objects for which the data has to be fetched.
So my question is:
1.Is there a way i can pass this List to the EmpDaoJdbcCursorItemReader and it will iterate through the object and set the parameter values from the EmployeeQueryCriteria object
2.Can i loop through the step to read data for every item in the ArrayList created containing EmployeeQueryCriteria and fetch the data.
The class EmpDaoJdbcCursorIte‌​mReader:
public class EmpDaoJdbcCursorIte‌​mReader extends JdbcCursorItemReader{
#BeforeStep
public void beforeStep(StepExecution stepExecution)
{
StringBuffer sqlQuerySB= new StringBuffer(super.getSql());
sqlQuerySB.append((").append(/*I am adding a comma seperated list of employee ids*/).append(")");
super.setSql(sqlQuerySB.toString());
}
}
My Spring configurations are as follows:
Spring-batch-core 2.2.2
Spring-beans 3.2.3
Spring-context 3.2.3
Can someone please provide suggestions on how to solve this problem.

Answer 1

you can iterate through the steps by following code model
<decision id="testLoop" decider="iterationDecider">
<next on="CONTINUABLE" to="pqrStep" />
<end on="FINISHED" />
</decision>
<step id="pqrStep" next="xyzStep">
<tasklet ref="someTasklet" />
</step>
<step id="xyzStep" next="testLoop">
<tasklet ref="someOtherTasklet" />
</step>
and Configuration is
<bean id="iterationDecider" class="com.xyz.StepFlowController" />
Following class will handle the flow based on the condition
public class StepFlowController implements JobExecutionDecider{
#Override
public FlowExecutionStatus decide(JobExecution jobExecution, StepExecution stepExecution) {
FlowExecutionStatus status = null;
try {
if (conditionIsTrue) {
status = new FlowExecutionStatus("CONTINUABLE");
}else {
status = new FlowExecutionStatus("FINISHED");
}
} catch (Exception e) {
e.printStackTrace();
}
return status;
}