Error When try to use rowid with table alias

Question

I tried to use table alias to test functions of rules manager and met the following problems.
1. I clone tables employees and departments from HR schema.
2. create event_struct as following:
BEGIN
dbms_rlmgr.create_event_struct(event_struct => 't_a');
dbms_rlmgr.add_elementary_attribute(event_struct => 't_a',
attr_name => 'a_employees',
tab_alias => exf$table_alias('employees'));
dbms_rlmgr.add_elementary_attribute(event_struct => 't_a',
attr_name => 'a_departments',
tab_alias => exf$table_alias('departments'));
END;
3. create rule class as following:
BEGIN
dbms_rlmgr.create_rule_class(rule_class => 't_as',
event_struct => 't_a',
action_cbk => 't_acb',
rslt_viewnm => 't_arv');
END;
4. after adding a rule to the rule class, I try to test as the following
DECLARE
r_emp ROWID;
r_dept ROWID;
CURSOR a_cur IS
SELECT emp.ROWID, dept.ROWID
FROM employees emp, departments dept
WHERE emp.department_id = dept.department_id;
i NUMBER := 1;
BEGIN
OPEN a_cur;
LOOP
FETCH a_cur
INTO r_emp, r_dept;
EXIT WHEN a_cur%NOTFOUND;
dbms_output.put_line(i);
i := i + 1;
dbms_output.put_line(r_emp);
dbms_rlmgr.add_event(rule_class => 't_alia',
event_inst => r_emp,
event_type => 'employees');
dbms_rlmgr.add_event(rule_class => 't_alia',
event_inst => r_dept,
event_type => 'departments');
END LOOP;
END;
But I got the following error
SQL> DECLARE
2 r_emp ROWID;
3 r_dept ROWID;
4 CURSOR a_cur IS
5 SELECT emp.ROWID, dept.ROWID
6 FROM employees emp, departments dept
7 WHERE emp.department_id = dept.department_id;
8 i NUMBER := 1;
9 BEGIN
10 OPEN a_cur;
11 LOOP
12 FETCH a_cur
13 INTO r_emp, r_dept;
14 EXIT WHEN a_cur%NOTFOUND;
15 dbms_output.put_line(i);
16 i := i + 1;
17 dbms_output.put_line(r_emp);
18 dbms_rlmgr.add_event(rule_class => 't_alia',
19 event_inst => r_emp,
20 event_type => 'employees');
21 dbms_rlmgr.add_event(rule_class => 't_alia',
22 event_inst => r_dept,
23 event_type => 'departments');
24 END LOOP;
25 END;
26 /
DECLARE
ERROR at line 1:
ORA-06550: line 1, column 36:
PLS-00201: identifier 'AAAVN9AAEAAAQH8AAA' must be declared
ORA-06550: line 1, column 7:
PL/SQL: Statement ignored
ORA-06512: at "EXFSYS.DBMS_RLMGR", line 974
ORA-06512: at line 18

Answer 1

Hello,
Rowids for the individual tables can be added as events only if the rule class is configured as a Composite one. For all other cases, rowids are treated just as data and they should be formatted as string of name-value pairs or instances of AnyData. Your script suggests that you intended to create a composite rule class so that you could add rowids individually. Please recreate the rule class as composite and try again. The error message you received is incorrect and has been fixed to indicate that the error is with the format of the data item passed in.
Hope this helps,
-Aravind.