AQ table for complex type creation

Question

I have a type containing nested tables, it looks like that:
create or replace type aq_student_reg_queue_type as object (
XML_ID varchar2(16),
trigger_name varchar2(32),
tm_transaction_id varchar2(30),
tm_transaction_type varchar2(30),
person aq_person_tm_type,
resources aq_community_resource_list);
aq_community_resource_list is table of aq_community_resource
aq_community_resource is another type containing table of resources
When I'm trying to create queue table for such payload I have an error that I have to specify nested table column or attribute. How to do that ? I can't find it somehow.

Answer 1

The problem is that you need to specify a storage clause for nested tables when you use a nested table inside a database table. When creating a queue, a table is created under the hood, which lacks a storage clause for the nested table. I don't know a way to provide this clause to AQ. A workaround is to use varrays instead. See this example:
SQL> create or replace type aq_community_tm_type as object(
  2  resource_code varchar2(30)
  3  );
  4  /
Type is aangemaakt.
SQL> create or replace type aq_community_tm_list as table of aq_community_tm_type;
  2  /
Type is aangemaakt.
SQL> create or replace type aq_community_resource as object(
  2  subscriber varchar2(30),
  3  resource_list aq_community_tm_list
  4  );
  5  /
Type is aangemaakt.
SQL> create or replace type aq_community_resource_list as table of aq_community_resource;
  2  /
Type is aangemaakt.
SQL> create or replace type aq_person_tm_type as object (
  2  PERSON_LDAP varchar2(30),
  3  FIRST_NAME varchar2(30),
  4  MIDDLE_NAME varchar2(30),
  5  SURNAME varchar2(30),
  6  GENDER varchar2(1),
  7  TITLE varchar2(16),
  8  DATE_OF_BIRTH date,
  9  PREFERRED_EMAIL varchar2(100),
10  PREFERRED_PHONE varchar2(20),
11  ORIGINATING_GROUP varchar2(50),
12  SUB_GROUP varchar2(2000),
13  LMS_DOMAIN_ID integer,
14  LMS_ROLE_ID integer,
15  COURSE_CODE varchar2(16),
16  COURSE_INSTANCE_CODE varchar2(16),
17  COURSE_INSTANCE_DATE date,
18  REGISTRATION_DATE date,
19  REF_OBJECT_ID number
20  );
21  /
Type is aangemaakt.
SQL> create or replace type aq_person_queue_tm_type as object (
  2  XML_ID varchar2(16),
  3  trigger_name varchar2(32),
  4  tm_transaction_id varchar2(30),
  5  tm_transaction_type varchar2(30),
  6  person aq_person_tm_type,
  7  resources aq_community_resource_list
  8  );
  9  /
Type is aangemaakt.
SQL> begin
  2    dbms_aqadm.create_queue_table
  3    ( queue_table        => 'my_queue_table'
  4    , queue_payload_type => 'aq_person_queue_tm_type'
  5    );
  6  end;
  7  /
begin
FOUT in regel 1:
.ORA-22913: must specify table name for nested table column or attribute
ORA-06512: at "SYS.DBMS_AQADM_SYS", line 2830
ORA-06512: at "SYS.DBMS_AQADM", line 58
ORA-06512: at line 2This probably is the error you are experiencing (hint: next time please provide it with your question).
When you use varrays, it will work:
SQL> drop type aq_person_queue_tm_type
  2  /
Type is verwijderd.
SQL> drop type aq_person_tm_type
  2  /
Type is verwijderd.
SQL> drop type aq_community_resource_list
  2  /
Type is verwijderd.
SQL> drop type aq_community_resource
  2  /
Type is verwijderd.
SQL> drop type aq_community_tm_list
  2  /
Type is verwijderd.
SQL> drop type aq_community_tm_type
  2  /
Type is verwijderd.
SQL> create or replace type aq_community_tm_type as object(
  2  resource_code varchar2(30)
  3  );
  4  /
Type is aangemaakt.
SQL> create or replace type aq_community_tm_list as varray(100) of aq_community_tm_type;
  2  /
Type is aangemaakt.
SQL> create or replace type aq_community_resource as object(
  2  subscriber varchar2(30),
  3  resource_list aq_community_tm_list
  4  );
  5  /
Type is aangemaakt.
SQL> create or replace type aq_community_resource_list as varray(10) of aq_community_resource;
  2  /
Type is aangemaakt.
SQL> create or replace type aq_person_tm_type as object (
  2  PERSON_LDAP varchar2(30),
  3  FIRST_NAME varchar2(30),
  4  MIDDLE_NAME varchar2(30),
  5  SURNAME varchar2(30),
  6  GENDER varchar2(1),
  7  TITLE varchar2(16),
  8  DATE_OF_BIRTH date,
  9  PREFERRED_EMAIL varchar2(100),
10  PREFERRED_PHONE varchar2(20),
11  ORIGINATING_GROUP varchar2(50),
12  SUB_GROUP varchar2(2000),
13  LMS_DOMAIN_ID integer,
14  LMS_ROLE_ID integer,
15  COURSE_CODE varchar2(16),
16  COURSE_INSTANCE_CODE varchar2(16),
17  COURSE_INSTANCE_DATE date,
18  REGISTRATION_DATE date,
19  REF_OBJECT_ID number
20  );
21  /
Type is aangemaakt.
SQL> create or replace type aq_person_queue_tm_type as object (
  2  XML_ID varchar2(16),
  3  trigger_name varchar2(32),
  4  tm_transaction_id varchar2(30),
  5  tm_transaction_type varchar2(30),
  6  person aq_person_tm_type,
  7  resources aq_community_resource_list
  8  );
  9  /
Type is aangemaakt.
SQL> begin
  2    dbms_aqadm.create_queue_table
  3    ( queue_table        => 'my_queue_table'
  4    , queue_payload_type => 'aq_person_queue_tm_type'
  5    );
  6  end;
  7  /
PL/SQL-procedure is geslaagd.
SQL> begin
  2    dbms_aqadm.drop_queue_table('my_queue_table');
  3  end;
  4  /
PL/SQL-procedure is geslaagd.Hope this helps.
Regards,
Rob.