Looking at Data in the IP_IN_QUEUE -- Payload Field within IP_MESSAGE_TYPE

Question

Does anyone have any sql, that would display the contents of the PAYLOAD field within the IP_MESSAGE_TYPE object, once a message gets queued after an incoming EDI transaction gets processed by B2B successfully --> note BPEL/SOA is not running at this point --> I just want to dump the XML itself.
I tried using the following code, but can not get the dbms_lob.read function to work properly; my dbms_lob.getlength function returns 5700, but I can not even read 250 bytes --> get sql "06502" PL/SQL numeric or value error: bind too small
--> I however can read 150 bytes .
Can someone perhaps figure this out.
CREATE OR REPLACE PROCEDURE b2b_deq AS
dequeue_options dbms_aq.dequeue_options_t;
message_properties dbms_aq.message_properties_t;
message_handle RAW(16);
ipmsg ip_message_type;
inp_clob               clob;
output_data_clob varchar2(2000);
len_clob               binary_integer;
start_pos_clob integer;
BEGIN
dequeue_options.consumer_name := 'b2buser';
dequeue_options.dequeue_mode := dbms_aq.remove;
dequeue_options.navigation := dbms_aq.next_message;
dequeue_options.wait := dbms_aq.forever;
dbms_aq.dequeue ( queue_name => 'IP_IN_QUEUE',
dequeue_options => dequeue_options,
                    message_properties => message_properties,
                    payload => ipmsg,
                    msgid => message_handle);
dbms_output.put_line('Message ID: ' || ipmsg.msg_id);
dbms_output.put_line('Message Size: ' || dbms_lob.getlength(ipmsg.payload));
SELECT ipmsg.payload INTO inp_clob FROM dual;
dbms_output.put_line('Message Size #2: ' || dbms_lob.getlength(inp_clob));
start_pos_clob := 1;
len_clob := 250;
dbms_lob.read(inp_clob,len_clob,start_pos_clob,output_data_clob);
dbms_output.put_line('Message XML: ' || output_data_clob);
Thanks.
Arthur (203-921-5925)

Answer 1

Thanks for the info --> it worked fine now.
Also Ramesh, with regards to an example/sample of a BPEL process that reads an 850 from an IP_IN_QUEUE and processes this txn via a PL/SQL api (OAD) -
someone has told me that this does exist somewhere --> do you have any knowledge on this piece of code perhaps.
My key point here is in the ability to post multiple line items into 11i via the process. I posted this question on the SOA forum, but no replies have come through in five days or so.
Thanks as always.
Arthur (203-921-5925)