Many time we need SQL query which return data page by page i.e. 30 or 40 records at a time, which can be specified as page size. In fact Database pagination is common requirement of Java web developers, especially dealing with largest data sets. In this article we will see how to query Oracle 10g database for pagination or how to retrieve data using paging from Oracle. Many Java programmer also use display tag for paging in JSP which supports both internal and external paging. In case of internal paging all data is loaded in to memory in one shot and display tag handles pagination based upon page size but it only suitable for small data where you can afford those many objects in memory. If you have hundreds of row to display than its best to use external pagination by asking databaseto do pagination. In pagination, ordering is another important aspect which can not be missed. It’s virtually impossible to sort large collection in Java using Comparator or Comparablebecause of limited memory available to Java program, sorting data in database using ORDER BY clause itself is good solution while doing paging in web application.
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