How to avoid editing a deleted record in a Table component

Question

Hi! Everyon,
I am building a prototype using JSC. In Page1.jsp, I have a table displaying the records. On column one there are buttons that allow the user to edit the record, including deleting it. My problem is: when somebody else deleted a record and if the current user tries to edit the same record by clicking the edit button on the corresponding row he will get the next record. Could somebody tell me how to solve this problem? Thanks in advance.
By the way, I do not access database directly from the Web part. Instead, I dropped a session bean's method on the Table compoment. In the edit button's event handler, I use
           TableRowDataProvider row = (TableRowDataProvider )getBean("currentRow");However, since that record was deleted already I always get the next record.
With best regards,
Daniel

Answer 1

Thank you very much for your help. And sorry for not explaining clearly.
I have a session bean that has getCities(), getCity(String code) and other methods. getCities() returns an array of CityDO objects and getCity(String) returns a CityDO object. class CityDO basically is a JavaBean containing city code, city name and other information. When I designed the web part using Java Studio Creator, I dropped a Table component to the design view first, then dropped the EJB method getCities() onto that Table component. Up to now, it is very similar to http://developers.sun.com/prodtech/javatools/jscreator/learning/tutorials/2/ejb.html and everything worked fine.
In order to edit a CityDO record, I added a column containg "edit" buttons into the Table component. If the user clicks the edit button we will show the CityDO in another page called editPage.jsp. In editPage.jsp, the user can update the city or simply delete it. Here is the major part of the event handler of the edit button in Page1,
    public String editCity_action() {
        TableRowDataProvider row = (TableRowDataProvider)getBean("currentRow");
        String code = (String)row.getValue("code");     // "code" is a field in CityDO
        CityDO city = null;
        try {
            city = cityClient1.getCity(code);
        } catch (Exception ex) {
            ex.printStackTrace();
            return null;
        getSessionBean1().setCity(city);          // pass the city to editPage
        return "editPage";
    }Usually, the above logic is good. However, if somebody else deleted one city and the current user tries to edit that deleted city (it is still in his table), he gets the next city. The real problem is in editCity_action(),
row.getValue("code") returns an updated value, but I only need the old one.
You memtioned ArrayList. That could be a good solution. Suppose I have an ArryList containing the CityDO objects, if I can bind the table to my ArrayList that will solve my problem. Could you tell me how to do the binding in that case?
Thank you again.
With best regards,
Daniel
By the way, I do not access database directly from
the Web part. I do not understand what you mean by the above
statement.
Instead, I dropped a session bean's
method on the Table compoment. Can you explain further. What method did you drop on
the Table component?
In the edit button's
event handler, I use
TableRowDataProvider row =
(TableRowDataProvider
)getBean("currentRow");However, since that
record was deleted already I always get the next
record.Here is the delete code from
http://developers.sun.com/prodtech/javatools/jscreator
/learning/tutorials/2/inserts_updates_deletes.html.
As is is working on the rowkey in the page bean's
table, that should not be affected by other users in
other sessions, the rowkey should not change, even if
the underlying record has changed.
    public String delete_action() {
form1.discardSubmittedValues("save");
try {
RowKey rk = tableRowGroup1.getRowKey();
if (rk != null) {
tripDataProvider.removeRow(rk);
tripDataProvider.commitChanges();
tripDataProvider.refresh();}
(Exception ex) {
log("ErrorDescription", ex);
error(ex.getMessage());
return null;
}What is the underlying structure for the table's
data. Is it a row cache from a query? Is it an
ArrayList?