Merge Records in Session bean by using ADF Drag/Drop
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by shantala.sankeshwar
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Published on Tue, 15 Mar 2011 14:37:00 +0530
Indexed on
2011/03/15
16:15 UTC
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This article describes how to merge multiple selected records in Session Bean using ADF drag & drop feature.
Below described is simple use case that shows how exactly this can be achieved.
Here we will have table & user input field.Table shows EMP records & user input field accepts Salary.When we drag & drop multiple records on user input field,the selected records get updated with the new Salary provided.
Steps:
Let us suppose that we have created Java EE Web Application with Entities from Emp table.Then create EJB Session Bean & generate Data control for the same.
Write a simple code in sessionEJBBean & expose this method to local interface :
public void updateEmprecords(List empList, Object sal)
{
Emp emp = null;
for (int i = 0; i < empList.size(); i++)
{
emp = em.find(Emp.class, empList.get(i));
emp.setSal((BigDecimal)sal);
}
em.merge(emp);
}
Now let us create updateEmpRecords.jspx page in viewController project & Drop empFindAll object as ADF Table
Define custom SelectionListener method for the table :
public void selectionListener(SelectionEvent selectionEvent)
{
// This method gets the Empno of the selected record & stores in the list object
UIXTable table = (UIXTable)selectionEvent.getComponent();
FacesCtrlHierNodeBinding fcr
=(FacesCtrlHierNodeBinding)table.getSelectedRowData();
Number empNo = (Number)fcr.getAttribute("empno") ;
this.getSelectedRowsList().add(empNo);
}Set table's selectedRowKeys to #{bindings.empFindAll.collectionModel.selectedRow}"
Drop inputText on the same jspx page that accepts Salary .Now we would like to drag records from the above table
& drop that on the inputtext field.This feature can be achieved by inserting dragSource operation inside the table &
dropTraget operation inside the inputText:
<af:dragSource discriminant="tab"/> //Insert this inside the table<af:inputText label="Enter Salary" id="it13" autoSubmit="true"
binding="# {test.deptValue}">
<af:dropTarget dropListener="#{test.handleTableDrop}">
<af:dataFlavor
flavorClass="org.apache.myfaces.trinidad.model.RowKeySet" discriminant="tab"/>
</af:dropTarget>
<af:convertNumber/>
</af:inputText>In the above code when the user drags & drops multiple records on inputText,the dropListener method gets called.
Goto the respective page definition file & create updateEmprecords method action& execute action
dropListener method code:
public DnDAction handleTableDrop(DropEvent dropEvent)
{
//Below code gets the updateEmprecords method,passes parameters & executes method
DataFlavor<RowKeySet> df = DataFlavor.getDataFlavor(RowKeySet.class);
RowKeySet droppedKeySet = dropEvent.getTransferable().getData(df);
if (droppedKeySet != null && droppedKeySet.size() > 0)
{
DCBindingContainer bindings =(DCBindingContainer)BindingContext.getCurrent().getCurrentBindingsEntry();
OperationBinding updateEmp;
updateEmp= bindings.getOperationBinding("updateEmprecords");
updateEmp.getParamsMap().put("sal",
this.getDeptValue().getAttributes().get("value"));
updateEmp.getParamsMap().put("empList", this.getSelectedRowsList());
updateEmp.execute();//Below code performs execute operation to refresh the updated records
OperationBinding executeBinding;
executeBinding= bindings.getOperationBinding("Execute");
executeBinding.execute();AdfFacesContext.getCurrentInstance().addPartialTarget(dropEvent.getDragComponent());
this.getSelectedRowsList().clear();
}
return DnDAction.NONE;
}Run updateEmpRecords.jspx page & enter any Salary say '5000'.
Select multiple records in table & drop these selected records on the inputText Salary.
Note that all the selected records salary value gets updated to 5000.
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