How to do Extension in "Update Standard Appraisal: Overview" page

Question

Hi,
I'm posting many threads for the past two days, but still i have lot of unknown things against my client's requirement. So here i posting my complete
requirement what i need to do.
My OA Page Navigation: HR Employee Self service (Responsibility) -> Performance Mangement (Function) ->Appraisals (Tab) ->Click Update Icon
Then "Update Standard Appraisal: Overview" page will appear, in that if i click "Add Competencies" button then competencies records are adding.
After i do the "proficiency rating" for each competency, i need to calculate the sum of all proficiency rating,
this sum should be shown in the screen and store in the database.
This is my requirement, please explain how to do this.
I already tried by the following steps:
1. Created button "Calculate Competencies" and message styled text "Competencies total score" by personalization.
2.Then i extended the CompetenciesCO controller using jdev 10g, i created CompetenciesExtendCO.java, then i written my logic.
3.I posted that new Controller in the same place where CompetenciesCO is avail (This process is suggested by Gyan to use a custom TOP under $JAVA_TOP).
4.Then i ran my page, but it throws "could not create java file" error.
Anyone can explain the whole process for this requirement, becuase i worked in development but not in extension/personalization.
Lot of Thanks in advance,
SAN

Answer 1

SAN,
use below to iterate through all the rows of column.
OAViewObject vo = getPoSimpleSummaryVO1(); //Replace getPoSimpleSummaryVO1 with the VO attached with the table
PoSimpleSummaryVORowImpl row = null;   
int matches = 0;
int fetchedRowCount = vo.getFetchedRowCount();  
RowSetIterator approveIter = vo.createRowSetIterator("approveIter");     
if (fetchedRowCount > 0)
     approveIter.setRangeStart(0);
     approveIter.setRangeSize(fetchedRowCount);     
     for (int i = 0; i < fetchedRowCount; i++)
       row = (PoSimpleSummaryVORowImpl)approveIter.getRowAtRangeIndex(i);         
       String selectFlag = (String)row.getAttribute("<AttributeName>");
       //Continue to add the above value withe the previous Value.
//The above code will give addition of all the rows...Once u get this value set the same to the Text Bean created Personalization.Regards,
Gyan