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Create JDBCBatchItemReader for reading multiple records at a time [BATCH-2548] #1054

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spring-issuemaster opened this issue Oct 15, 2016 · 1 comment

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@spring-issuemaster spring-issuemaster commented Oct 15, 2016

sathiyaseelan muthukumar opened BATCH-2548 and commented

Hi,

Scenario:
In Processor, we have to execute multiple database calls for each record from the reader.
We could reduce the number of database calls using in clause, if we get multiple records at a time from reader to processor instead of one record at a time.

It would be better, that if we have a reader with configurable chunk size, that would return list of Items (something like AggregateJDBCItemReader).

Thanks
Sathya


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@spring-issuemaster spring-issuemaster commented Nov 4, 2018

Mahmoud Ben Hassine commented

The contract of an item reader is to read one item at a time. Making it return multiple items would be a breaking change and more importantly not compatible anymore with the mechanics of retry/skip that Spring Batch provides.

That said, the interface is generic, so nothing prevents you from making an item reader return a list of items. However, we would not include such an implementation in the framework, this would be better contributed to the spring-batch-exetensions repository if you want.

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