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The Select Approver function activity calls a PL/SQL stored procedure named WF_REQDEMO.SelectApprover

that determines who the next approver is based on the employee approval hierarchy in the demonstration data model.

Result Type
This activity expects a response of 'T' if an approver is found or 'F' if an approver is not found. The possible responses are defined in a lookup type called Boolean, associated with the Standard item type.

PL/SQL Stored Procedure
The PL/SQL stored procedure that this function activity calls is described in detail below. Each section in the procedure is numbered with the notation 1-> for easy referencing.

procedure SelectApprover (itemtype in varchar2,
                                itemkey in varchar2,
                                actid in number,
                                funcmode in varchar2,
                                resultout out varchar2) is

1-> l_forward_from_username varchar2(320);
      l_forward_to_username varchar2(320);

2-> begin
      if (funcmode = 'RUN') then
          l_forward_to_username := wf_engine.GetItemAttrText (
                                            itemtype => itemtype,
                                            itemkey => itemkey,
                                             aname => 'FORWARD_TO_USERNAME');

3-> if (l_forward_to_username is null) then
              l_forward_to_username := wf_engine.GetItemAttrText (
                                             itemtype => itemtype,
                                             itemkey => itemkey,
                                               aname => 'REQUESTOR_USERNAME');
          end if;

4->  l_forward_from_username := l_forward_to_username;

5-> wf_engine.SetItemAttrText (itemtype => itemtype;
                                     itemkey => itemkey,
                                     aname => 'FORWARD_FROM_USERNAME';
                                     avalue => l_forward_from_username);

6-> l_forward_to_username := wf_reqdemo.GetManager(
                                               l_forward_from_username);

7-> wf_engine.SetItemAttrText (itemtype => itemtype;
                                     itemkey => itemkey,
                                     aname => 'FORWARD_TO_USERNAME';
                                     avalue => l_forward_to_username);

8-> if (l_forward_to_username is null) then
              resultout :='COMPLETE:F';
          else
              resultout :='COMPLETE:T';
          end if;

9-> end if;

10-> if (funcmode = 'CANCEL') then
          resultout :='COMPLETE';
          return;
      end if;

11-> if (funcmode = 'TIMEOUT') then
          resultout :='COMPLETE';
          return;
      end if;

12-> exception
          when others then
               wf_core.context('WF_REQDEMO','SelectorApprover',itemtype,
                                itemkey,actid,funcmode);
               raise;

13-> end SelectApprover;

1-> The local arguments l_forward_from_username, and l_forward_to_username are declared in this section.

2-> If the value of funcmode is RUN, then retrieve the name of the last person that this requisition was forwarded to for approval by assigning l_forward_to_username to the value of the FORWARD_TO_USERNAME item type attribute, determined by calling the Workflow Engine API GetItemAttrText. See: GetItemAttribute, Oracle Workflow API Reference.

3-> If the value of l_forward_to_username is null, then it means that the requisition has never been forwarded for approval. In this case, assign it the value of the REQUESTOR_USERNAME item type attribute, determined by calling the Workflow Engine API GetItemAttrText.

4-> Assign l_forward_from_username to the value of l_forward_to_username.

5-> This section assigns the value of l_forward_from_username to the FORWARD_FROM_USERNAME item type attribute by calling the Workflow Engine SetItemAttrText API.

6-> This section calls the function GetManager to return the manager of the previous approver stored in l_forward_from_username, from the WF_REQDEMO_EMP_HIERARCHY table and assigns that manager's name to l_forward_to_username.

7-> This section assigns the value of l_forward_to_username to the FORWARD_TO_USERNAME item type attribute by calling the Workflow Engine SetItemAttrText API.

8-> If l_forward_to_username is null, meaning there is no manager above the previous approver in the hierarchy, then assign resultout to be COMPLETE:F. Otherwise, assign resultout to be COMPLETE:T.

9-> This ends the check on funcmode =' RUN'.

10-> If the value of funcmode is CANCEL, then assign resultout to be COMPLETE.

11-> If the value of funcmode is TIMEOUT, then assign resultout to be COMPLETE.

12-> This section calls WF_CORE.CONTEXT if an exception occurs, to include context information in the error stack to help you locate the source of an error. See: CONTEXT, Oracle Workflow API Reference.

13-> This section marks the end of the procedure.

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