Dequeue problem using deq_condition

Question

Hello All,
I have a payload that is an named object
type x_data_fragments AS OBJECT (
df_value_1 VARCHAR2(60),
df_prime_value_1 VARCHAR2(60),
df_prime_value_2 VARCHAR2(60));
I desire to conditionally dequeue when df_value_1 is equal to contents of a variable p_condition.
Database version is 10.2.0.3.0
This is a Single consumer queue.
This works, the "EXIT WHEN" line below in the code SNIPPET01:
EXIT WHEN (l_data_fragments.df_value_1 = p_condition);
Ideally I'd like to use the deq_condition Dequeue Option.
That is my problem and what I'm asking for help with.
I cannot get deq_condition to work. see SNIPPET02 below.
I've tried many flavors of syntax.
I even tried a function that returned the df_value_1 fragment from the object, with this syntax:
l_dequeue_options.deq_condition :=
'MyPackage.F_GET_DF_VALUE_1_VALUE(tab.user_data.x_data_fragments) = '||''''||p_condition||'''';
Can't get it to work with deq_condition.
Gives ORA-00904: "TAB"."USER_DATA"."X_DATA_FRAGMENTS": invalid identifier
I can't tell if this is an AQ bug or whether I have bad syntax.
Any help is most appreciated.
Thanks,
Tom
SNIPPET01:
PROCEDURE p_dequeue_conditional(p_qname IN VARCHAR2,
p_condition IN VARCHAR2,
p_data_fragments OUT x_data_fragments)
IS
DEQUEUE_CONDIT_FAIL EXCEPTION;
LOOP_CNT INTEGER := 0;
MAX_WAIT INTEGER := 0;
l_dequeue_options DBMS_AQ.dequeue_options_t;
l_message_properties DBMS_AQ.message_properties_t;
l_message_handle RAW(16);
l_data_fragments x_data_fragments;
BEGIN
l_dequeue_options.dequeue_mode := DBMS_AQ.BROWSE;
LOOP
DBMS_AQ.DEQUEUE(
queue_name => p_qname,
dequeue_options => l_dequeue_options,
message_properties => l_message_properties,
payload => l_data_fragments,
msgid => l_message_handle
EXIT WHEN (l_data_fragments.df_value_1 = p_condition);
END LOOP;
SNIPPET02:
PROCEDURE p_dequeue_conditional(p_qname IN VARCHAR2,
p_condition IN VARCHAR2,
p_wait_seconds IN NUMBER,
p_data_fragments OUT x_data_fragments)
IS
l_dequeue_options DBMS_AQ.dequeue_options_t;
l_message_properties DBMS_AQ.message_properties_t;
l_message_handle RAW(16);
l_data_fragments x_data_fragments;
BEGIN
l_dequeue_options.navigation := DBMS_AQ.FIRST_MESSAGE;
l_dequeue_options.wait := p_wait_seconds;
l_dequeue_options.deq_condition :=
'tab.user_data.x_data_fragments.df_value_1 = '''||p_condition||'''';
DBMS_AQ.DEQUEUE(
queue_name => p_qname,
dequeue_options => l_dequeue_options,
message_properties => l_message_properties,
payload => l_data_fragments,
msgid => l_message_handle
p_data_fragments := l_data_fragments;
COMMIT;
END;

Answer 1

Afternoon,
Problem solved.
A wonderful co-worker put different pair of eyes on my item.
My user_data is of my object type.
Changed this:
'MyPackage.F_GET_DF_VALUE_1_VALUE(tab.user_data.x_data_fragments) = '||''''||p_condition||'''';
To this:
'MyPackage.F_GET_DF_VALUE_1_VALUE(tab.user_data) = '||''''||p_condition||'''';
All working fine now.
Thanks for your time.
Tom