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| Can we retrive the two different type message from same Q |
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| aditya |
 Posted: Mon Mar 12, 2007 8:35 pm Post subject: Can we retrive the two different type message from same Q |
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Newbie
Joined: 19 Feb 2007
Posts: 3
Location: Bangalore
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In our project there are two MQ .net application . Application 1 is putting a CLOB as String in Q1 and BLOB as byte array in to same Q1 from D/B and Application 2 is getting both message from the same Q1 and then decompress the BLOB message i.e. to CLOB and then doing some operation on both type of messages.
Problem comes while application 2 is retriving the message from the Q1 , because Application 2 will not know which message need to be decompress. How can i make it to identify which message need to be decompress. i.e. to differentiate b/w the BLOB and CLOB. as well as is it possible that application 2 can retrive the BLOB as byte array and CLOB as string seprately from Q1. |
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| Vitor |
| Posted: Tue Mar 13, 2007 1:13 am Post subject: |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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Are you really using MQ Everplace? Or did you post in this section in the mistaken belief it was the API section?
Assuming the latter (because your post indicates that):
The queue has no knowledge per se of the message content it's holding. It's a matter for the reading application to interpret the content it GETs from the queue and act accordingly, e.g. reading the root tag of an XML document to determine further processing. In your case your Application 2 needs to determine the content by some means based on the data.
I can think of 3 solutions:
Split the processing into separate queues. Application 1 writes BLOB messages into 1 queue, CLOB into the other. Application 2 processes according to which queue it's reading;
Application 1 includes an RFH2 header with the message, adding additional information into that to allow Application 2 to determine how to process;
Application 1 uses a custom MQMD.Format type to distinguish the messages.
I would not think twice before using a custom MQMD.Format. I would think three or four times, then go for a little walk, think some more and then have another think. I mention it as an option for completness, but there are a lot of potential issues around doing that.
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Insanity is the best defence. |
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| jefflowrey |
| Posted: Tue Mar 13, 2007 4:32 am Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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If the byte array actually represents character data, then the receiving application can likely just read it as if it were a CLOB rather than a BLOB.
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