-- Database dynamic if for your question :           condition saved in table.column -> 'var1 = 1 ' 

create or replace FUNCTION my_condition ( p_if_stmt in varchar2, P_value in Number) return BOOLEAN is
   v_ifstmt    VARCHAR2(220);
   v_result    NUMBER       := NULL;
   v_ret       BOOLEAN      := FALSE;
BEGIN
    -- i.E. substitue expression before the equal-sign with p_value, Known in the Formsrecord
    -- substr('B1.item1 = 1',instr('B1.item1 = 1','='), length( 'B1.item1 = 1'))
  v_ifstmt := to_char(P_value)||' ' ||substr(p_if_stmt,instr(p_if_stmt,'='), length( p_if_stmt));
  v_ifstmt := 'select 1 from dual where '||v_ifstmt ;
    -- dbms_output.put_line('IFSTMT=' ||v_ifstmt);

   EXECUTE IMMEDIATE v_ifstmt INTO v_result ;
    -- When a record is found,  by select from dual, theCondition is True
    -- ELSE an EXCEPTION IS RAISED (NO_DATA_FOUND))
    v_ret := TRUE;
    return V_RET;
  Exception
   WHEN NO_DATA_FOUND THEN
    return FALSE;
   WHEN OTHERS THEN -- how to handle OTHER ERRORS
   RAISE;
END;

--- TESTCASEs for
-- FUNCTION my_condition ( p_if_stmt in varchar2, P_value in Number) return BOOLEAN
--
declare
erg BOOLEAN;
begin
-- RETURN FALSE
 erg := my_condition ('Block1.item1 = 1', 2);
 IF erg THEN
  dbms_output.put_line('Condition TRUE');
 ELSE
  dbms_output.put_line('Condition FALSE');
 END IF;
 -- RETURN TRUE
  erg := my_condition ('Block1.item1 = 1', 1);
 IF erg THEN
  dbms_output.put_line('Condition TRUE');
 ELSE
  dbms_output.put_line('Condition FALSE');
 END IF;

 -- RAISE ERROR
 Begin
   erg := my_condition ('Block1.item1 xx 1', 1);
 IF erg THEN
  dbms_output.put_line('Condition TRUE');
 ELSE
  dbms_output.put_line('Condition FALSE');
 END IF;
 exception
  when others then
   dbms_output.put_line('ERROR ORA '||SQLCODE||': '||SQLERRM);
  end;
end;


##########################################

EXAMPLE 2
##########################################

--- FORMS dynamic if for your question :       condition saved in table.column -> 'var1 = 1 ' 

PACKAGE cond_by_group IS
  PROCEDURE prc_cr_group;
  FUNCTION forms_condition ( p_if_stmt in varchar2, P_value in Number) return BOOLEAN;
END;

PACKAGE BODY cond_by_group IS
    rg_name VARCHAR2(40) := 'CHECKCONDITION';
    rg_id RecordGroup; gc_id GroupColumn;

    -- Create_Group i.E in when new form-instance-trigger
    -- cond_by_group.prc_cr_group;
  PROCEDURE prc_cr_group IS
  BEGIN
  /* ** Make sure the record group does not already exist.*/
  rg_id := Find_Group(rg_name);
  /* ** If it does not exist, create it and add the two ** necessary columns to it. */
  IF Id_Null(rg_id) THEN
  rg_id := Create_Group(rg_name);
  /* Add a number columns to the record group */
    gc_id := Add_Group_Column(rg_id, 'IFCOND', NUMBER_COLUMN);
  END IF;
  end;

  -- check condition to use in post-query in your case
FUNCTION forms_condition ( p_if_stmt in varchar2, P_value in Number) return BOOLEAN IS
  v_ifstmt    VARCHAR2(220);
  the_rowcount NUMBER;
  errcode NUMBER;
BEGIN

    -- i.E. substitue expression before the equal-sign with p_value, Known in the Formsrecord
    -- substr('B1.item1 = 1',instr('B1.item1 = 1','='), length( 'B1.item1 = 1'))
  v_ifstmt := to_char(P_value)||' ' ||substr(p_if_stmt,instr(p_if_stmt,'='), length( p_if_stmt));
  v_ifstmt := 'select 1 from dual where '||v_ifstmt ;
  errcode := Populate_Group_With_Query( rg_id, v_ifstmt );
  the_rowcount := GET_GROUP_ROW_COUNT(rg_id);
  if NVL(the_rowcount,0) >0 THEN
  	return true;
  else
  	return false;
  END IF;
END;

END;