Re: Data Queue - non-destructive reads

On 01-Mar-2012 07:08 , Gqcy wrote:

I am attempting to read a data queue (non-keyed, FIFO) to determine
the Sender info, and am setting the remove entry to *NO.

however I keep reading the same (first) record. Is there a trick to
progress through the data queue???

I see that the DSPDTAQ utility uses DMPOBJ to get at the data queue
data, but I would like to use QRCVDTAQ if I can... >

If not for DDM DTAQ objects, then use the QMHRDQM API to get all of the messages. Limit the receiver size according to the number of messages that should be read; use the 'R'everse invocation if\when alternate of the LIFO or the FIFO is desirable.

i_ Retrieve Data Queue Message (QMHRDQM) API i_
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The Retrieve Data Queue Message (QMHRDQM) API retrieves one or more messages from a data queue.

The QMHRDQM API allows the retrieval of multiple messages per call. The message selection information parameter allows you to have some control over which messages are returned. The QMHRDQM API can be used to retrieve the following:

* The first or last message of a data queue
* All messages of a data queue
* Selected messages from a keyed data queue

The QMHRDQM API is similar in function to the QRCVDTAQ API. However, the QRCVDTAQ API can remove the received message from the data queue; QMHRDQM API does not remove received messages.

Distributed data management (DDM) data queues are not supported using this API.

...

RDQS0100 Format

The following table describes the RDQS0100 format of the Message selection information parameter. This format is used with data queues when selection with keys is not necessary. This format cannot be used with keyed data queues. ...
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Regards, Chuck