StackOverflow2013

Note that there are some explanatory texts on larger screens.

plurals

PO
primarykey
Id
2372923
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2010-03-03T16:16:59.820
FavoriteCount
0
LastActivityDate
2010-03-03T16:45:40.943
LastEditDate
2017-05-23T12:30:45.007
LastEditorUserId
-1
OwnerUserId
157882
ParentId
2372648
PostTypeId
2
Score
2
ViewCount
0
LastEditorDisplayName
text
Body
You will always have memory problems when the Java code hauls/copies the entire dataset of a datastore (e.g. a RDBMS) in Java's memory and then do the sorting and filtering right in Java's memory using Java code. It will get worse when you even store it in the session scope of a webapplication. The most memory efficient approach is to let the DB do the task where it is invented for. The SQL language offers you under each the <code>ORDER BY</code> clause to do the sorting, the <code>WHERE</code> clause to do the filtering and the (DB vendor specific) <code>LIMIT/OFFSET</code> clauses/subselects/functions to return only a subset of records based on firstrow and rowcount or lastrow. This way you end up with only the dataset in Java's memory which is actually to be displayed. There is no standard JSF component which does exactly that. It will always require the entire dataset being available in the Java memory, because the filtering and sorting needs to happen with pure Java code or Javascripts. JSF knows nothing about SQL, you'll need to provide a custom implementation of <a href="http://java.sun.com/javaee/6/docs/api/javax/faces/model/DataModel.html" rel="nofollow noreferrer"><code>javax.faces.model.DataModel</code></a> to the datatable and/or control/manage that in the data access layer yourself. You can get a lot of new insights/ideas and find a kickoff example in <a href="http://balusc.blogspot.com/2008/10/effective-datatable-paging-and-sorting.html" rel="nofollow noreferrer">this article</a>. You can also find examples of the needed SQL queries in <a href="https://stackoverflow.com/questions/1986998/resultset-to-pagination">this JSP-targeted answer</a> I posted before here. Good luck.
Tags
Title
singulars
PostAcceptedAnswerId
1. This table or related slice is empty.
PostParentId
1. POLarge JSF dataTable backed by database that can handle paging/sorting
 singulars
 PostTypePostTypeId
 PTQuestion
PostTypePostTypeId
1. PTAnswer
UserLastEditorUserId
1. USCommunity
UserOwnerUserId
1. USBalusC
plurals
PostLinksPostIdRelatedPostId
1. This table or related slice is empty.
PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. This table or related slice is empty.
PostsParentIdCreationDate
1. This table or related slice is empty.
VotesPostIdCreationDate
1. VO
 singulars
 PostPostId
 PO
 UserUserId
 This table or related slice is empty.
 VoteTypeVoteTypeId
 VTUpMod
CommentsPostId
1. This table or related slice is empty.

Querying!

Guidance

A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.