On Thu, May 29, 2008 at 12:09 PM, nanotech <[EMAIL PROTECTED]> wrote: > > Hi, > I have a search form (in a panel)with various search fields(as text fields) > on it. User should be able to fill in any number of search parameters and > the results are to be displayed in table (with pagenation + sorting > capablity on columns) in a different panel on the same page under the search > panel. > > I started looking at DataTable. It seems a option that will solve my need. > > Looking at the datatable example on > http://www.wicket-library.com/wicket-examples/repeater/ > > I observed that the following methods get called in the order > > 1. size() from CustomSortableDataProvider. > 2. iterator() from CustomSortableDataProvider > 3. load() from CustomLoadableDetachableModel. > > If I understand it correctly:-(Please correct me if I am wrong) > * size() requires , the number of records that provider will be working > with. So, in above case i'll have to make query thrrough service layer /DAO > like this Select count(*) from Employees where firstName Like 'ABC' and > lastName Like 'XYZ' > > * iterator(final int first, final int count) will call Service layer/DAO to > do the actual query like this Select * from Employees where firstName Like > 'ABC' and lastName Like 'XYZ' > > * finally in model ...I will call the CustomLoadableDetachableModel and its > load() method will load the actual Employee model for each item that will > be displayed on first page of the list being rendered in data table. > > > It seems that there are too many queries in case of datatable. If the result > set has thousands of records and we are displaying 100 per page then it will > do 100+ queries to render all the items. > > Questions: > 1. Did I sum up about DataTable correctly?
no, there are only two queries per page render of datatable. > If yes, Won't this be a > bottleneck considering the number of queries? > 2. Is there a better way of doing this? not until someone finds one. -igor > > Thanks, > RG > > > > > > > > -- > View this message in context: > http://www.nabble.com/Using-DataTable-tp17543606p17543606.html > Sent from the Wicket - User mailing list archive at Nabble.com. > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
