Netbeans dataprovider JSF page with data table

Question

I have crated a database very similar to the one that is shown as an example on the Netbeans site tutorial Insert, Update, Delete. Except that the table doesnt have any linking dropdown list that controls the information displayed on the table. It connects to an oracle database. The table has 4 columns, all of which are editable text fields. THey participate in a virtual form with a save changes button i have. I also have an insert button on the page which adds an extra row to be populated. When a new row is created and saved I set a CREATER DATE AND CREATE USER field as well. Currently I have all of this working.
My issue is I need to add code to my savebutton action code so that it checks if any of the existing entries in the database, any of the fields were changed. And if so I need to set UPDATE DATE and UPDATE USER fields for the respective row. What I dont understand is how I check once the user hits the save button the submited changes against the values already in the database. Below is my save button code. (The TRANSFR_AGENTID code is to set the primary incrementing key for new entries).
public String savebtn_action() {
// TODO: Process the action. Return value is a navigation
// case name where null will return to the same page.
//Navigate through
try {
//if (trnsfr_agentDataProvider.getRowCount() > 0){
// trnsfr_agentDataProvider.cursorFirst();
CachedRowSetDataProvider maxTransID = getSessionBean1().getMaxTrnsfrAgentIDDataProvider();
maxTransID.refresh();
maxTransID.cursorFirst();
java.math.BigDecimal num1, num2;
java.math.BigDecimal newTransId = ((java.math.BigDecimal) maxTransID.getValue("MAXTRNSFR_AGENTID"));
System.out.println("###### newTransID = " + newTransId);
if (newTransId == null){
newTransId = new java.math.BigDecimal(1.0);
System.out.println("###### after null if comparison newTransID = " + newTransId);
num1 = new java.math.BigDecimal(1.0000);
num2 = new java.math.BigDecimal(-1.0000);
if (trnsfr_agentDataProvider.getRowCount() > 0) {
trnsfr_agentDataProvider.cursorFirst();
do {
if (trnsfr_agentDataProvider.getValue("TRNSFR_AGENT_ID").equals(new Double(0))) {
trnsfr_agentDataProvider.setValue("TRNSFR_AGENT_ID", (java.math.BigDecimal) newTransId);
newTransId = newTransId.add(num1);
} while (trnsfr_agentDataProvider.cursorNext());
trnsfr_agentDataProvider.commitChanges();
} catch (Exception ex) {
log("Error Description", ex);
error("Error :" + ex.getMessage());
return null;
}

Answer 1

http://www.oracle.com/technology/products/jdev/101/howtos/jsfdrilldown/index.html