Search Page with TopLink + ADF Faces

Question

Hi,
I develop a project with JDeveloper 10.1.3.1.0.3984 using Toplink and ADF Faces.
I test with the embedded OC4J Server.
I must search in a table with 100 000 rows.
I follow the tutorial ADF Faces (Chapter 7) :
http://www.oracle.com/technology/obe/ADF_tutorial_1013/10131/index.htm
The search page contains a search form with the table of results.
I add a Refresh Condition ${adfFacesContext.postback} that keeps the form from executing the query until the user clicks the search button. (Page 7-10)
It works, but when I launch the search with some parameters, I have a "out of memory" exception, and the good results are displayed in the table.
I activate the Toplink log, make a new research, and I see 2 sql requests.
The first one had the default parameters "%" :
select ... from company where name="%" and cp = "%" and town="%"
The second one had the good parameters written in the search form :
select ... from company where name="Uno%" and cp = "65000" and town="%"
How to avoid the first sql request ?
Thanks a lot for your help.
Greetings
PM

Answer 1

Hi Shay,
Thank for your response. I have followed your advice :
Re: Search Page - Toplink - Double queries
After several tests, I simplify the problem. I think that the problem doesn't come from Toplink but ADF lifecycle.
1 - With JDeveloper, I create a simple named query with two parameters (Toplink).
2 - After, I generate my facade EJB Session Class, add some debug ouputs to see the parameters in the search method and deactivate the code which call the named query (It was not nessary), and create a JSP page using ADF components.
3 - I drag and drop the search method from the data control panel to the jsp page and create a parameter form.
4- I run the application. The search page appears with the parameter form. There is no debug output. When I complete the search form and click on the search button, I see the parameter values in the log console. It's normal.
5- Now, I drag and drop the collection from data control panel to the jsp page and create a ADF Read-Only Table.
6- I complete Refresh condition :
<methodIterator id="searchComp2Iter"
Binds="searchComp2.result"
DataControl="SessionEJBLocal" RangeSize="10"
BeanClass="test.model"
RefreshCondition="${adfFacesContext.postback &amp;&amp; ( bindings.argum1 != null) &amp;&amp; (bindings.argum2 != null) }"
Refresh="ifNeeded"/>
7- When I launch the application, There is no debug output. The refresh condition works.
8- I fill parameters and I click on the search button. I obtain the log :
07/01/03 11:21:49 TEST 2
07/01/03 11:21:49 argum1 :null
07/01/03 11:21:49 argum2 :null
07/01/03 11:21:49 TEST 2
07/01/03 11:21:49 argum1 :a
07/01/03 11:21:49 argum2 :b
The EJB Session search method is called twice. It's the problem. Why the first call?
9- When I click a second time on the search button, the EJB Session search method is called once.
07/01/03 11:22:03 TEST 2
07/01/03 11:22:03 argum1 :a
07/01/03 11:22:03 argum2 :b
How can I have only one call in paragraph 8 ?
Thank you for your help.
P.M. MARTIN