Temp tables in spring batch - spring-batch

Question

The query in my reader takes a really long time to fetch results due to multiple table joins. I am considering the option of splitting my query joins, using temp tables if possible. is this a feasible solution ? can spring batch support use of temp tables between the reader, processor and writer ?

Answer 1

Yes it is possible. You should use Same DataSource instance for your reader, writer, processor.
Example:
#Component
public class DataSourceDao{
DataSource dataSource;
public DataSource getDataSource() {
return dataSource;
}
#Autowired
public void setDataSource(DataSource dataSource) {
this.dataSource = dataSource;
}
}
Reader:
public class MyReader implements ItemReader<POJO_CLASS> {
#Autowired
DataSourceDao dataSource;
#Override
JdbcCursorItemReader<POJO_CLASS> reader= new
JdbcCursorItemReader<>();
public <POJO_CLASS> read() throws Exception, UnexpectedInputException,
ParseException, NonTransientResourceException {
reader.setDataSource(dataSource.getDataSource());
// Implement your read logic
}
}
Writer:
public class YourWriter implements ItemWriter<POJO_CLASS> {
JdbcBatchItemWriter<POJO_CLASS> writer= new JdbcBatchItemWriter<>();
#Autowired
DataSourceDao dataSource;
void write(List<? extends POJO_CLASS> POJO)
{
writer.setDataSource(dataSource.getDataSource());
<Your logics...>
}