oracle.jbo.html.databeans
Class RowsetNavigator

java.lang.Object
  |
  +--oracle.jdeveloper.html.WebBeanImpl
        |
        +--oracle.jdeveloper.html.DataWebBeanImpl
              |
              +--oracle.jbo.html.databeans.RowsetNavigator

public class RowsetNavigator

extends DataWebBeanImpl

The RowsetNavigator Data Web Bean changes the current record of a View Object's RowSet to a new record.

The RowsetNavigator class, which is aggregated by the NavigationBar Data Web Bean, processes any navigation requests passed to the page from the toolbar. These navigation requests are determined by the value of the NAVIGATE parameter from the JSP's request and set the current record of the View Object's RowSet to the appropriate record. The possible values for NAVIGATE and their associated actions are:

• NEXT - goto the next record
• PREV - goto the previous record
• FIRST - goto the first record
• LAST - goto the last record
• NEXTSET - goto the next page
• PREVSET - goto the previous page
• DELETE - delete the current record
• COMMIT - commit the current record to the database
• ROLLBACK - discard changes to the record

JDeveloper's JSP Element wizard instantiates the RowsetNavigator class in a jsp:useBean tag in a .jsp file. Along with the class, the wizard also includes an ID and a scope declaration set to request. If you change the scope to any other value, you will have to handle possible multithreading issues.

The definition of the RowSet navigator provided by the wizard includes these methods: setReleaseApplicationResources, initialize, and render. For example,

  <jsp:useBean   class="oracle.jbo.html.databeans.RowsetNavigator"
                  id="navDetail"  scope="request" >
  <%

 	navDetail.setReleaseApplicationResources(false);
	navDetail.initialize(application,session, request,response,out,
          "package3_Package3Module.EmpView");
	navDetail.render();
   %>
   </jsp:useBean>>
 

The value assigned to the setReleaseApplicationResources method determines whether the Application Module is released after RowsetNavigator Data Web Bean processes it. Typically, the value should not be set to true unless this is the last Web Bean to be processed in the JSP page.

Do not include more than one instance of RowsetNavigator bound to the same View Object on a JSP page. If you do, the toolbar action will be performed more than once. For example, if you have two instances of RowsetNavigator bound to the same View Object, and you click the Next Record button on the toolbar bound to the View Object, then the display will skip ahead two records.

Fields inherited from class oracle.jdeveloper.html.DataWebBeanImpl

attributeRenderers, bReleaseApplication, dispAttrs, qView, sApplication, sRowSetName

Fields inherited from class oracle.jdeveloper.html.WebBeanImpl

application, ctx, out, page, request, response, session

Constructor Summary

RowsetNavigator()

Method Summary

void	execute() Reads the NAVIGATE parameter from the JSP's request and sets the current record of the View Object's RowSet to the appropriate record.
void	render() Renders the Web Bean's contents to the output stream.

Methods inherited from class oracle.jdeveloper.html.DataWebBeanImpl

clearDisplayAttributes, getApplicationFromContext, getApplicationName, getAttributeLabel, getDisplayAttributeDefs, getDisplayAttributes, getDisplayFieldRenderer, getEditFieldRenderer, getRowFromKey, getRowKey, getRowSet, getViewObjectName, handleCommit, initialize, initialize, initialize, internalInitialize, isAppStateful, releaseApplicationResources, releaseApplicationResources, setDisplayAttributes, setDisplayFieldRenderer, setDisplayFieldRenderer, setEditFieldRenderer, setEditFieldRenderer, setReleaseApplicationResources, setRowSet, shouldDisplayAttribute

Methods inherited from class oracle.jdeveloper.html.WebBeanImpl

generateScriptSrc, getCookie, getOut, getRenderingContext, getRequest, getRequestVariable, getUniqueName, initBeanForJS, initialize, initialize, initialize, render, setRequestVariable

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

RowsetNavigator

public RowsetNavigator()

Method Detail

execute

public void execute()
             throws java.lang.Exception

Reads the NAVIGATE parameter from the JSP's request and sets the current record of the View Object's RowSet to the appropriate record. The possible values for NAVIGATE are:

• NEXT - goto the next record
• PREV - goto the previous record
• FIRST - goto the first record
• LAST - goto the last record
• NEXTSET - goto the next page
• PREVSET - goto the previous page
• DELETE - delete the current record
• COMMIT - commit the current record to the database
• ROLLBACK - discard changes to the record

render

public void render()
            throws java.lang.Exception

Renders the Web Bean's contents to the output stream.

Overrides:

render in class WebBeanImpl