java - Spring MVC + hibernate batch loading from db -


sorry guys if trivial question, want figure out right way. there large table 'account' (about 10000 entries). want iterate through logic entity , merge if needed. don't want load entries in memory.

currently this

list<account> accounts = accountsdao.all(); (account a: accounts) {   dosomecode(a);   accountsdao.merge(a); }

how can improve it?

have @ setfirstresult , setmaxresults rather manually , quite explicit queries (think sql's limit clause).

there setfetchsize let driver/database chunk results of unlimited query (example in postgresql jdbc docs). scrollableresults seems quite similar (regarding usage @ least): getting result iterator scroll on matched records (example in random blog post).

as question database using: there differences between databases and/or drivers. not know specifics here, features regarding loading in chunks must supported respective db driver.


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