Sunday, February 17, 2013

Parameters for a PL/SQL in Workflow API



When the Workflow Engine calls a stored procedure for a unction activity, it passes four parameters to the procedure and may expect a result when the procedure completes.

Itemtype (IN) : Internal name of the item
Itemkey (IN) : A string to uniquely identify the item type instance
Actid (IN) : ID of the activity from where this procedure is called.
Funcmode (IN) : Execution mode of the activity
Resultout (OUT) : Result Type of the activity

FUNCMODE : For functions, it can be RUN or CANCEL
For notifications, it can be RESPOND, FORWARD, TRANSFER or TIMEOUT

RESULTOUT : COMPLETE:: Activity successful.
WAITING : Pending for some other activity
DEFERRED: : Activity deferred till
NOTIFIED::: Activity notified to with a . Externally, must be completed using WF_ENGINE.CompleteActivity.
ERROR: :Activity encounters an error

PL/SQL Coding Standards
Procedure
( itemtype in varchar2,
itemkey in varchar2,
actid in number,
funcmode in varchar2,
resultout out varchar2 )
is
;
Begin
if ( funcmode = ’RUN’ ) then
resultout := ’COMPLETE:;
return;
end if;
if ( funcmode = ’CANCEL’ ) then
resultout := ’COMPLETE’;
return;
end if;
if ( funcmode = ’RESPOND’ ) then
resultout := ’COMPLETE’;
return;
end if;
if ( funcmode = ’FORWARD’ ) then
resultout := ’COMPLETE’;
return;
end if;
if ( funcmode = ’TIMEOUT’ ) then
resultout := ’COMPLETE’;
return;
end if;
if ( funcmode = ’TRANSFER’ ) then
resultout := ’COMPLETE’;
return;
end if;
Exception
When others then
WF_CORE.CONTEXT (’’, ’’, , , to_char(),
);
raise;
End ;

==========================================================================

Example for Custom Requisition WF :

PROCEDURE Req_App_Process(Requisitionid IN VARCHAR2,
RequisitionDesc IN VARCHAR2,
RequisitionAmount IN NUMBER,
RequestorUsername IN VARCHAR2,
ProcessOwner IN VARCHAR2,
Workflowprocess IN VARCHAR2 DEFAULT NULL,
item_type IN VARCHAR2 DEFAULT NULL ) IS
--
ItemType VARCHAR2(30) := NVL(item_type,'WFDEMO');
ItemKey VARCHAR2(30) := RequisitionNumber;
ItemUserKey VARCHAR2(80) := RequisitionDesc;
--
BEGIN
--
-- Start Process :
-- If workflowprocess is passed, it will be run.
-- If workflowprocess is NOT passed, the selector function
-- defined in the item type will determine which process to run.
--
Wf_Engine.CreateProcess( ItemType => ItemType,
ItemKey => ItemKey,
process => WorkflowProcess );

Wf_Engine.SetItemUserKey (ItemType => ItemType,
ItemKey => ItemKey,
UserKey => ItemUserKey);
--
-- Initialize workflow item attributes
--
Wf_Engine.SetItemAttrText (itemtype => itemtype,
itemkey => itemkey,
aname => 'REQUISITION_NUMBER',
avalue => RequisitionNumber);
--
Wf_Engine.SetItemAttrText (itemtype => itemtype,
itemkey => itemkey,
aname => 'REQUISITION_DESCRIPTION',
avalue => ItemUserKey);
Wf_Engine.SetItemAttrNumber( itemtype => itemtype,
itemkey => itemkey,
aname => 'REQUISITION_AMOUNT',
avalue => RequisitionAmount );
--
Wf_Engine.SetItemAttrText (itemtype => itemtype,
itemkey => itemkey,
aname => 'REQUESTOR_USERNAME',
avalue => RequestorUsername);
Wf_Engine.SetItemOwner ( itemtype => itemtype,
itemkey => itemkey,
owner => ProcessOwner );
--
Wf_Engine.StartProcess( itemtype => itemtype,
itemkey => itemkey );
EXCEPTION
WHEN OTHERS THEN
--
Wf_Core.context ('WF_REQDEMO','StartProcess',RequisitionNumber,RequisitionAmount,
RequestorUsername,ProcessOwner,Workflowprocess);
RAISE;
--
END Req_App_Process;

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