| Re: [eclipselink-users] Lazying-loading and Collection.size() |
size() will instantiate lazy collections in EclipseLink and any other JPA implementation that I know of. I'm not sure the JPA spec says anything about it. cowwoc wrote: > > Hi, > > What does the JPA standard (and alternatively EclipseLink) say about Lazy > Loading and Collection/Set/List.size()? If the collection hasn't been > initialized yet, does size() simply invoke a count(*) query or does it > retrieve the entire collection including its elements? > > I'm thinking of the following use-case: > > 1) int size = myList.size(); > 2) Object randomElement = myList.get((int) (Math.random() * size)); > > What is guaranteed to happen under the hood according to JPA and according > to EclipseLink? Ideally I want to pass a Collection around my API, instead > of forcing it to be Query-aware and issue SQL statements explicitly. > > Thank you, > Gili > ----- --- http://wiki.eclipse.org/User:James.sutherland.oracle.com James Sutherland http://www.eclipse.org/eclipselink/ EclipseLink , http://www.oracle.com/technology/products/ias/toplink/ TopLink Wiki: http://wiki.eclipse.org/EclipseLink EclipseLink , http://wiki.oracle.com/page/TopLink TopLink Forums: http://forums.oracle.com/forums/forum.jspa?forumID=48 TopLink , http://www.nabble.com/EclipseLink-f26430.html EclipseLink Book: http://en.wikibooks.org/wiki/Java_Persistence Java Persistence -- View this message in context: http://www.nabble.com/Lazying-loading-and-Collection.size%28%29-tp19581000p19608160.html Sent from the EclipseLink - Users mailing list archive at Nabble.com.