RowSetInfo; bc4j; how to get the View Object

Question

So I'm trying to get/update/insert/delete records in a database that contain an interMedia image in a blob.
I've figured out that I can't simply set the ImmediateAccess attribute. It doesn't like that...
So I'm trying to go after the view object, since the interMedia white paper uses a VO row setAttribute to accomplish the write.
RowSetInfo extends ResultSetInfo which has a method getViewObject(). Cool.
So I try it... and get an error that getViewObject() has protected access.
Anyone know what I am doing wrong? Or should I be even taking this approach?!?!?!
If I go exclusively with the VO layer... how do I preserve the navigationBar functionality? Or do I need to roll my own?
( NOTE: This hilights another example of the perception of 'friction' between rowsetinfos and the view objects/entity objects. An approach that makes "sense" to me as a naive novice didn't pan out. And oddly, most of the bc4j examples go against VOs when, if you are an application programmer, you may never see or use the VO methods ( although it looks like we should be)... we're working at the ResultSetInfo layer. )
Is the the observation of other folk who are building Java Applications/Applets? Or do you all work directly with VOs instead of going through the ResultSetInfo "layer"?

Answer 1

Here is some sample code that I am currently working on and will post on OTN when complete. The code shows how to access a BC4J Domain based on an Oracle type. Working with interMedia is similar since interMedia utilizes Oracle Object types. Please note that I have not tested this yet against interMedia, but I'm hoping that you may find the general process useful.
// Copyright (c) 2000 Oracle Corporation
package ObjectSampleDAC;
import oracle.dacf.control.swing.*;
import javax.swing.*;
import oracle.dacf.dataset.*;
import oracle.dacf.dataset.connections.*;
import java.awt.*;
import oracle.jdeveloper.layout.*;
import java.awt.event.*;
import javax.infobus.*;
import oracle.jbo.domain.DomainInterface;
import ObjectSampleBC4J.common.TAddress;
import java.sql.SQLException;
* A Frame class.
* <P>
* @author Scott Tiger
public class Frame1 extends InfoFrame {
* Constructs a new instance.
public Frame1() {
super();
try {
jbInit();
sessionInfo1.publishSession();
// call my initialization method
bfInit();
catch (Exception e) {
e.printStackTrace();
* Initializes the state of this instance.
private void jbInit() throws Exception {
/* All of the following code in this method was added by the designer except where noted below
EmailrowSetInfo1.setName("Email");
jPanel3.setLayout(gridBagLayout1);
StatusrowSetInfo1.setName("Status");
AddressrowSetInfo1.setName("Address");
PasswordrowSetInfo1.setName("Password");
UsernamerowSetInfo1.setName("Username");
LastnamerowSetInfo1.setName("Lastname");
FirstnamerowSetInfo1.setName("Firstname");
IdrowSetInfo1.setName("Id");
rowSetInfo1.setAttributeInfo( new AttributeInfo[] {
IdrowSetInfo1,
FirstnamerowSetInfo1,
LastnamerowSetInfo1,
UsernamerowSetInfo1,
PasswordrowSetInfo1,
AddressrowSetInfo1,
StatusrowSetInfo1,
EmailrowSetInfo1} );
this.setDataItemName("infobus:/oracle/sessionInfo1");
this.setTitle("Customer Information");
this.getContentPane().setLayout(borderLayout1);
this.setSize(new Dimension(536, 473));
jPanel1.setLayout(borderLayout2);
sessionInfo1.setAppModuleInfo(new ModuleInfo("ObjectSampleBC4J", "ObjectSampleBC4JModule"));
sessionInfo1.setConnectionInfo(new LocalConnection("MyJdbcConn"));
sessionInfo1.setName("sessionInfo1");
rowSetInfo1.setQueryInfo(new QueryViewInfo(
"CustomerView",
rowSetInfo1.setSession(sessionInfo1);
rowSetInfo1.setName("rowSetInfo1");
/* The following listener was added using the event tab in the property inspector in design
mode. The rowsetPopulated method is called when the rowset is queried/requeried.
rowSetInfo1.addChangeListener(new oracle.dacf.dataset.ChangeAdapter() {
public void rowsetPopulated(RowSetChangeEvent e) {
rowSetInfo1_rowsetPopulated(e);
textFieldControl1.setText("textFieldControl1");
textFieldControl2.setDataItemName("infobus:/oracle/sessionInfo1/rowSetInfo1/Firstname");
textFieldControl2.setText("textFieldControl2");
textFieldControl3.setDataItemName("infobus:/oracle/sessionInfo1/rowSetInfo1/Lastname");
textFieldControl3.setText("textFieldControl3");
textFieldControl4.setDataItemName("infobus:/oracle/sessionInfo1/rowSetInfo1/Username");
textFieldControl4.setText("textFieldControl4");
textFieldControl5.setDataItemName("infobus:/oracle/sessionInfo1/rowSetInfo1/Password");
textFieldControl5.setText("textFieldControl5");
textFieldControl6.setDataItemName("infobus:/oracle/sessionInfo1/rowSetInfo1/Status");
textFieldControl6.setText("textFieldControl6");
textFieldControl7.setDataItemName("infobus:/oracle/sessionInfo1/rowSetInfo1/Email");
textFieldControl7.setText("textFieldControl7");
navigationBar1.setDataItemName("infobus:/oracle/sessionInfo1/rowSetInfo1");
jLabel1.setText("ID:");
jLabel2.setText("First Name:");
jLabel3.setText("Last Name:");
jLabel4.setText("User Name:");
jLabel5.setText("Password:");
jLabel6.setText("Status:");
jLabel7.setText("Email:");
jLabel8.setText("Address:");
jPanel4.setLayout(      gridBagLayout2);
textFieldStreet.setColumns(20);
textFieldStreet.setText("textFieldStreet");
/* The following listener (as well as the listeners on textFieldCity, textFieldState, and
textFieldZipcode were added by the designer, but the focusGained and focusLost methods
were modified in each case to call a common textField_focusGained method
textFieldStreet.addFocusListener(new java.awt.event.FocusAdapter() {
public void focusGained(FocusEvent e) {
textField_focusGained(e);
public void focusLost(FocusEvent e) {
textField_focusLost(e);
textFieldCity.setColumns(20);
textFieldCity.setText("textFieldCity");
textFieldCity.addFocusListener(new java.awt.event.FocusAdapter() {
public void focusGained(FocusEvent e) {
textField_focusGained(e);
public void focusLost(FocusEvent e) {
textField_focusLost(e);
textFieldState.setColumns(20);
textFieldState.setText("textFieldState");
textFieldState.addFocusListener(new java.awt.event.FocusAdapter() {
public void focusGained(FocusEvent e) {
textField_focusGained(e);
public void focusLost(FocusEvent e) {
textField_focusLost(e);
textFieldZipcode.setColumns(20);
textFieldZipcode.setText("textFieldZipcode");
textFieldZipcode.addFocusListener(new java.awt.event.FocusAdapter() {
public void focusGained(FocusEvent e) {
textField_focusGained(e);
public void focusLost(FocusEvent e) {
textField_focusLost(e);
jLabel9.setText("Street:");
jLabel10.setText("City:");
jLabel11.setText("State:");
jLabel12.setText("Zip Code:");
textFieldControl1.setDataItemName("infobus:/oracle/sessionInfo1/rowSetInfo1/Id");
this.getContentPane().add(jPanel1, BorderLayout.CENTER);
jPanel1.add(jPanel2, BorderLayout.NORTH);
jPanel2.add(navigationBar1, null);
jPanel1.add(jPanel3, BorderLayout.CENTER);
jPanel3.add(textFieldControl1, new GridBagConstraints2(1, 0, 1, 1, 1.0, 0.0,
GridBagConstraints.WEST, GridBagConstraints.HORIZONTAL, new Insets(37, 11, 0, 0), 0, 0));
jPanel3.add(textFieldControl2, new GridBagConstraints2(1, 1, 1, 1, 1.0, 0.0,
GridBagConstraints.WEST, GridBagConstraints.HORIZONTAL, new Insets(7, 11, 0, 0), 0, 0));
jPanel3.add(textFieldControl3, new GridBagConstraints2(1, 2, 1, 1, 1.0, 0.0,
GridBagConstraints.WEST, GridBagConstraints.HORIZONTAL, new Insets(7, 11, 0, 0), 0, 0));
jPanel3.add(textFieldControl4, new GridBagConstraints2(1, 3, 1, 1, 1.0, 0.0,
GridBagConstraints.WEST, GridBagConstraints.HORIZONTAL, new Insets(6, 11, 0, 0), 0, 0));
jPanel3.add(textFieldControl5, new GridBagConstraints2(1, 4, 1, 1, 1.0, 0.0,
GridBagConstraints.WEST, GridBagConstraints.HORIZONTAL, new Insets(6, 11, 0, 0), 0, 0));
jPanel3.add(textFieldControl6, new GridBagConstraints2(1, 5, 1, 1, 1.0, 0.0,
GridBagConstraints.WEST, GridBagConstraints.HORIZONTAL, new Insets(7, 11, 0, 0), 0, 0));
jPanel3.add(textFieldControl7, new GridBagConstraints2(1, 6, 1, 1, 1.0, 0.0,
GridBagConstraints.WEST, GridBagConstraints.HORIZONTAL, new Insets(6, 11, 0, 0), 0, 0));
jPanel3.add(jLabel1, new GridBagConstraints2(0, 0, 1, 1, 0.0, 0.0,
GridBagConstraints.WEST, GridBagConstraints.NONE, new Insets(37, 106, 0, 0), 0, 0));
jPanel3.add(jLabel2, new GridBagConstraints2(0, 1, 1, 1, 0.0, 0.0,
GridBagConstraints.WEST, GridBagConstraints.NONE, new Insets(8, 54, 0, 0), 0, 0));
jPanel3.add(jLabel3, new GridBagConstraints2(0, 2, 1, 1, 0.0, 0.0,
GridBagConstraints.WEST, GridBagConstraints.NONE, new Insets(8, 54, 0, 0), 0, 0));
jPanel3.add(jLabel4, new GridBagConstraints2(0, 3, 1, 1, 0.0, 0.0,
GridBagConstraints.WEST, GridBagConstraints.NONE, new Insets(10, 54, 0, 0), 0, 0));
jPanel3.add(jLabel5, new GridBagConstraints2(0, 4, 1, 1, 0.0, 0.0,
GridBagConstraints.WEST, GridBagConstraints.NONE, new Insets(8, 62, 0, 0), 0, 0));
jPanel3.add(jLabel6, new GridBagConstraints2(0, 5, 1, 1, 0.0, 0.0,
GridBagConstraints.WEST, GridBagConstraints.NONE, new Insets(9, 83, 0, 0), 0, 0));
jPanel3.add(jLabel7, new GridBagConstraints2(0, 6, 1, 1, 0.0, 0.0,
GridBagConstraints.WEST, GridBagConstraints.NONE, new Insets(9, 86, 0, 0), 0, 0));
jPanel3.add(jLabel8, new GridBagConstraints2(0, 7, 1, 1, 0.0, 0.0,
GridBagConstraints.WEST, GridBagConstraints.NONE, new Insets(7, 72, 94, 0), 0, 0));
jPanel3.add(jPanel4, new GridBagConstraints2(1, 7, 1, 1, 0.0, 0.0,
GridBagConstraints.WEST, GridBagConstraints.NONE, new Insets(0, 0, 0, 0), 0, 0));
jPanel4.add(textFieldZipcode, new GridBagConstraints2(1, 3, 1, 1, 0.0, 0.0,
GridBagConstraints.WEST, GridBagConstraints.NONE, new Insets(0, 10, 0, 0), 0, 0));
jPanel4.add(textFieldState, new GridBagConstraints2(1, 2, 1, 1, 0.0, 0.0,
GridBagConstraints.WEST, GridBagConstraints.NONE, new Insets(0, 10, 0, 0), 0, 0));
jPanel4.add(jLabel9, new GridBagConstraints2(0, 0, 1, 1, 0.0, 0.0,
GridBagConstraints.EAST, GridBagConstraints.NONE, new Insets(5, 0, 0, 0), 0, 0));
jPanel4.add(textFieldStreet, new GridBagConstraints2(1, 0, 1, 1, 0.0, 0.0,
GridBagConstraints.WEST, GridBagConstraints.NONE, new Insets(0, 10, 0, 0), 0, 0));
jPanel4.add(jLabel10, new GridBagConstraints2(0, 1, 1, 1, 0.0, 0.0,
GridBagConstraints.EAST, GridBagConstraints.NONE, new Insets(5, 0, 0, 0), 0, 0));
jPanel4.add(jLabel11, new GridBagConstraints2(0, 2, 1, 1, 0.0, 0.0,
GridBagConstraints.EAST, GridBagConstraints.NONE, new Insets(5, 0, 0, 0), 0, 0));
jPanel4.add(jLabel12, new GridBagConstraints2(0, 3, 1, 1, 0.0, 0.0,
GridBagConstraints.EAST, GridBagConstraints.NONE, new Insets(5, 0, 0, 0), 0, 0));
jPanel4.add(textFieldCity, new GridBagConstraints2(1, 1, 1, 1, 0.0, 0.0,
GridBagConstraints.WEST, GridBagConstraints.NONE, new Insets(0, 10, 0, 0), 0, 0));
/* The following vaiable declarations were made by the designer
BorderLayout borderLayout1 = new BorderLayout();
JPanel jPanel1 = new JPanel();
SessionInfo sessionInfo1 = new SessionInfo();
RowSetInfo rowSetInfo1 = new RowSetInfo();
AttributeInfo IdrowSetInfo1 = new AttributeInfo(java.sql.Types.NUMERIC);
AttributeInfo FirstnamerowSetInfo1 = new AttributeInfo(java.sql.Types.VARCHAR);
AttributeInfo LastnamerowSetInfo1 = new AttributeInfo(java.sql.Types.VARCHAR);
AttributeInfo UsernamerowSetInfo1 = new AttributeInfo(java.sql.Types.VARCHAR);
AttributeInfo PasswordrowSetInfo1 = new AttributeInfo(java.sql.Types.VARCHAR);
AttributeInfo AddressrowSetInfo1 = new AttributeInfo();
AttributeInfo StatusrowSetInfo1 = new AttributeInfo(java.sql.Types.VARCHAR);
AttributeInfo EmailrowSetInfo1 = new AttributeInfo(java.sql.Types.VARCHAR);
JPanel jPanel2 = new JPanel();
JPanel jPanel3 = new JPanel();
TextFieldControl textFieldControl1 = new TextFieldControl();
TextFieldControl textFieldControl2 = new TextFieldControl();
TextFieldControl textFieldControl3 = new TextFieldControl();
TextFieldControl textFieldControl4 = new TextFieldControl();
TextFieldControl textFieldControl5 = new TextFieldControl();
TextFieldControl textFieldControl6 = new TextFieldControl();
TextFieldControl textFieldControl7 = new TextFieldControl();
BorderLayout borderLayout2 = new BorderLayout();
NavigationBar navigationBar1 = new NavigationBar();
JLabel jLabel1 = new JLabel();
JLabel jLabel2 = new JLabel();
JLabel jLabel3 = new JLabel();
JLabel jLabel4 = new JLabel();
JLabel jLabel5 = new JLabel();
JLabel jLabel6 = new JLabel();
JLabel jLabel7 = new JLabel();
JLabel jLabel8 = new JLabel();
GridBagLayout gridBagLayout1 = new GridBagLayout();
JPanel jPanel4 = new JPanel();
JTextField textFieldStreet = new JTextField();
JTextField textFieldCity = new JTextField();
JTextField textFieldState = new JTextField();
JTextField textFieldZipcode = new JTextField();
JLabel jLabel9 = new JLabel();
JLabel jLabel10 = new JLabel();
JLabel jLabel11 = new JLabel();
JLabel jLabel12 = new JLabel();
GridBagLayout gridBagLayout2 = new GridBagLayout();
/* The following declarations were made manually
/* DomainAccess provides a means for getting and setting values of a column object as domain
DomainAccess da = null;
/* TAddress is the domain class
TAddress addr = null;
/* Declare variables for determining if JTextField values have been changed by user
String oldVal = null;
String newVal = null;
/* The following method is generated by the wizard when the frame was created
protected void processWindowEvent(WindowEvent e) {
super.processWindowEvent(e);
if (e.getID() == WindowEvent.WINDOW_CLOSED) {
System.exit(0);
public void bfInit () throws Exception {
/* To add code to be invoked when the user moves from one row to another, get the
DataItemChangeManager from the RowSetInfo (via RowsetAccess) and add a
DataItemChangeListener. The specific method we want to use here is rowsetCursorMoved
which is invoked when the user moves from one row to another; the other methods are
defined simply because the interface requires them.
RowsetAccess ra = rowSetInfo1.getRowsetAccess();
DataItemChangeManager dcm = (DataItemChangeManager)ra;
dcm.addDataItemChangeListener(new DataItemChangeListener() {
public void rowsetCursorMoved(RowsetCursorMovedEvent e) {
rowSetInfo1_rowsetCursorMoved(e);
public void dataItemAdded(DataItemAddedEvent e) {
public void dataItemDeleted(DataItemDeletedEvent e) {
public void dataItemRevoked(DataItemRevokedEvent e) {
public void dataItemValueChanged(DataItemValueChangedEvent e) {
/* This method was generated by the designer. See rowSetInfo1.addChangeListener(...) in jbInit
above.
void rowSetInfo1_rowsetPopulated(RowSetChangeEvent e) {
try {
/* When the rowset is populated, set the JTextField values based on the domain. See
updateFields() below.
updateFields();
catch (Exception ex) {
System.out.println("Error occurred while retrieving values");
ex.printStackTrace();
/* This method was added manually to track row navigation. See dcm.addDataItemChangeListener(...)
in jbInit above.
void rowSetInfo1_rowsetCursorMoved(RowsetCursorMovedEvent e) {
try {
/* When the user moves from one row to another, set the JTextField values based on the
domain. See updateFields() below.
updateFields();
catch (Exception ex) {
System.out.println("Error occured while assigning values");
ex.printStackTrace();
/* This method finds the values from each field of the column object by using the domain, then
sets the values of the JTextFields respectively. It is invoked when the rowset is initially
populated, and each time the user moves from one row to another.
public void updateFields () throws Exception {
/* Get DataItem for the Address column object and cast to DomainAccess for to prepare for
getting and setting column value as domain.
da = (DomainAccess)AddressrowSetInfo1.getImmediateAccess();
/* Get the value of the attribute as a Domain and cast to DomainInterface.
DomainInterface di = da.getValueAsDomain();
/* null out addr. Otherwise, if the address column is null for a particular record, when
the user navigates to the record with the null values, addr will retain the previous record's
values. This ensures a clean slate.
addr = null;
/* Using DomainInterface allows us to cast the domain object to the specific Domain class for
that type. So, cast the address attribute's value to TAddress, the class that
represents the T_ADDRESS type created in the database. This provides getters and setters
for each of the fields of the Object Type.
if ( di instanceof TAddress ) {
addr = (TAddress) di;
/* If the above statement resulted in some non-null object assigned to addr, it is because
one or more of the fields of the domain contained non-null values. Therefore, if addr is
not null, get the values from each field of the domain and assign them to their
respective JTextFields. Otherwise, set each JTextField to an empty string.
if (addr != null) {
textFieldStreet.setText(addr.getStreet());
textFieldCity.setText(addr.getCity());
textFieldState.setText(addr.getState());
textFieldZipcode.setText(addr.getZipcode());
else {
textFieldStreet.setText("");
textFieldCity.setText("");
textFieldState.setText("");
textFieldZipcode.setText("");
/* If addr is null, after making sure the JTextFields are cleared, create a new TAddress
object so that we have something to assign values to if the user edits the JTextFields.
try {
addr = new TAddress();
catch (SQLException ex) {
System.out.println("Error creating domain TAddress");
ex.printStackTrace();
/* The method below is invoked when the user navigates to textFieldStreet, textFieldCity,
textFieldState, or textFieldZipcode. It's used just to find the value of the field when
the user enters the field (the "before" value).
void textField_focusGained(FocusEvent e) {
Object obj = e.getSource();
if (obj instanceof JTextField) {
JTextField field = (JTextField)obj;
oldVal = field.getText();
/* The method below is invoked when the user navigates away from textFieldStreet, textFieldCity,
textFieldState, or textFieldZipcode. It checks to see if the user changes the value of the
field, and if so, updates the value of the address attribute.
void textField_focusLost(FocusEvent e) {
/* Find out the value of the JTextField now that the user is attempting to leave the field.
Object obj = e.getSource();
if (obj instanceof JTextField) {
JTextField field = (JTextField)obj;
newVal = field.getText();
/* Compare the new value of the field ("after" value) to the "before" value captured
in textField_focusGained above. If they are equal, we do nothing. If they are not equal,
then the user must have changes the value in the field, and we have some work to do.
if (!oldVal.equals(newVal)) {
/* Since this same method is called regardless of which JTextField has been left, we find
out which text field the user is leaving, and then set the value of the appropriate
element of the addr domain.
if (obj.equals(textFieldStreet)) {
addr.setStreet(newVal);
if (obj.equals(textFieldCity)) {
addr.setCity(newVal);
if (obj.equals(textFieldState)) {
addr.setState(newVal);
if (obj.equals(textFieldZipcode)) {
addr.setZipcode(newVal);
/* So, we've set the value of the appropriate element of the addr domain, but we have not
"posted" those changes to the BC4J (middle-tier), so if we were to commit at this point
our changes would not get saved to the database (because BC4J is not aware of these
changes). The next step is to notify BC4J of the changes.
try {
da.setValueAsDomain(addr);
catch (InvalidDataException ex) {
System.out.println("Invalid Data assigned to TAddress");
ex.printStackTrace();
/* Clear out the oldVal and newVal variable so we are ready to track more changes.
oldVal = null;
newVal = null;
}-- Brian