Обсуждение: can you use variables in PostgreSQL rules?

i am currently migrating a db from Oracle to Pg and in some of my triggers i use variables, i.e. i have some thing like this:

  [Oracle version]

  CREATE OR REPLACE TRIGGER "USERACTION_VIEW" INSTEAD OF INSERT ON "USERACTION_VIEW" DECLARE

        UserActionID INTEGER;

        UserActionDataID INTEGER;

begin

SELECT USERACTION_SQ.nextval into UserActionID FROM DUAL;

SELECT USERACTIONDATA_SQ.nextval into UserActionDataID FROM DUAL;

INSERT INTO USERACTION

              (

               UserActionID,

               LocalID,

               UserActionTypeID,

               ActionDate

               )

              VALUES

              (

               UserActionID,

               :new.LocalID,

               :new.UserActionTypeID,

               SYSDATE

              ); 

INSERT INTO USERACTIONDATA

              (

               UserActionDataID,

               UserActionID,

               AccountID,

               CourseRecordID,

               CourseRecordPaymentID,

               StudentID,

               CourseRecordTestID,

               CourseRecordLessonID              

               )

              VALUES

              (

               UserActionDataID,

               UserActionID,

               :new.AccountID,

               :new.CourseRecordID,

               :new.CourseRecordPaymentID,

               :new.StudentID,

               :new.CourseRecordTestID,

               :new.CourseRecordLessonID

              );           

end;

so basically i have two variables here, UserActionID and UserActionDataID. so when i am porting to PostgreSQL i will need to make this a rule since Pg triggers only work for tables. The problem though is that i don't know how to use variabvles in Pg rules. Any ideas? Is it possible at all?

Thanks.