Will the reports scale

Question

<p>Hello All</p><p>I have created a report connected to a data source at design time. At run time a condition is added to the query in Java and the resultset is passed to the report. The report first page displays correct information. When i click on the next page the report sends a request back to the servlet, the run time condition is not available and the report displays the data which was used to design the report. </p><p>Why does the report send the request back to the servelet everytime i select go to the next page..If this is the way it behaves then it will not scale. Am i doing this right or is something missing..</p><p>Any help is highly appreciated</p><p> thanks</p><p>ram</p><p>&#160;</p>

Answer 1

<p> </p><p>The report viewer works via postback for any requests (page navigation, print, export, refresh etc on the viewer toolbar).  </p><p>From your comments, it appears the postback is re-entering from the start of your report load/generation code.  </p><p>The recommended workflow is to store the report ReportSource in HTTP Session, then have CrystalReportViewer retrieve it.  You&#39;ll have to ensure that postbacks do not go through your report loading/generation code, but go directly to the viewing code.  </p><p>You can do this in one of two ways:</p><p>  1. Keep the report load/generation code and viewing code in the same servlet, but detect any postbacks from the viewer to ensure you don&#39;t go through the report load/generation code but go directly to the viewing code (where you would pass it the ReportSource from HTTP Session).</p><p> 2.  Separate the report load/generation code and viewing code. Here you&#39;ll have one servlet load/generate the report and store the ReportSource in HTTP Session, then send a client redirect (Response.sendRedirect(....)) to a servlet with viewer code which retrieves the ReportSource from HTTP Session.  Here, any postbacks from the viewer will go directly to the viewer servlet.</p><p>TUeda </p><p> </p>