Spring Batch Database Dependency pass parameters to SQL statement - spring-batch

Question

I want separate the sql from the batch.xml file, so I defined the sql statement into a properties file. Inside the batch.xml I bind the property-placeholder bean then point to the properties file.
For simple select statement should not be a problem. But if I want to pass the parameter as where clause condition is it possible to do that?
<context:property-placeholder
location="classpath:batch-sql.properties/>
<bean id="secondReader"
class="org.springframework.batch.item.database.JdbcCursorItemReader"
scope="step">
<property name="dataSource" ref="dataSource" />
<property name="sql" value="${sql1}" />
<property name="rowMapper">
<bean class="com.test.batchjob.process.TestPersonMapper" />
</property>
</bean>
This is my sql statment in properties file:
SELECT * FROM Person WHERE id = ?
Can the id pass from jobparameter?

Answer 1

To set the parameters of the query in a JdbcPagingItemReader, you have to use the property parametersValue. This property takes a Map<String,Object> where the key is either the named parameter or the index of the parameter (if you use ?).
<bean id="secondReader"
class="org.springframework.batch.item.database.JdbcPagingItemReader"
scope="step">
<property name="queryProvider">
<bean class="org.springframework.batch.item.database.support.SqlPagingQueryProviderFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="selectClause" value="select *" />
<property name="fromClause" value="from persons" />
<property name="whereClause" value="where id = ?" />
</bean>
</property>
<property name="parametersValue">
<map>
<entry key="1" value="#{jobParameters['id']}" />
</map>
</property>
<property name="rowMapper">
<bean class="com.test.batchjob.process.TestPersonMapper" />
</property>
</bean>
See documentation : JdbcPagingItemReader
UPDATE
You have to use a QueryProvider instead of sql and datasource properties.
You can replace the text of the query by values of the properties file.

Answer 2

To set the parameters of the query in a JdbcCursorItemReader, you have to use the property preparedStatementSetter. This property takes a PreparedStatementSetter which you have to implement yourself to set either named or index-based parameters.
<bean id="secondReader"
class="org.springframework.batch.item.database.JdbcCursorItemReader"
scope="step">
<property name="sql" value="${sql1}" />
<property name="itemPreparedStatementSetter">
<bean class="xx.xx.xx.YourPreparedStatementSetter">
<property name="id" value="#{jobParameters['id']}" />
</bean>
</property>
<property name="rowMapper">
<bean class="com.test.batchjob.process.TestPersonMapper" />
</property>
An example implementation of a PreparedStatementSetter :
public class YourPreparedStatementSetter implements PreparedStatementSetter {
private String id;
#Override
public void setValues(PreparedStatement ps) throws SQLException {
ps.setString(1, this.id);
}
public setId(String id) {
this.id = id;
}
}

Answer 3

For JdbcCursorItemReader, you can take a look at answer here : Using Spring Batch JdbcCursorItemReader with NamedParameters