Is using a OneToManyResultSetExtractor/ResultSetExtractor with Spring Batch's JdbcCursorItemReader possible? -

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i wondering whether using onetomanyresultsetextractor or resultsetextractor spring batch's jdbccursoritemreader?

the issue have expected rowmapper deals 1 object per row , have join sql query returns many rows per object.

out of box, not support use of resultsetextractor. reason wrapping itemreader stateful , needs able keep track of how many rows have been consumed (it wouldn't know otherwise). way type of functionality typically done in spring batch using itemprocessor enrich object. itemreader return 1 (of 1 many) , itemprocessor enrich object many. common pattern in batch processing called driving query pattern. can read more in spring batch documentation here: http://docs.spring.io/spring-batch/trunk/reference/html/patterns.html

that being said, wrap jdbccursoritemreader own implementation performs logic of aggregation you.


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