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MQSeries.net Forum IndexWebSphere Message Broker SupportPreferred way of accessing a database in IIB10

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leao
PostPosted: Thu Dec 06, 2018 5:46 am Post subject: Preferred way of accessing a database in IIB10 Reply with quote

Newbie

Joined: 06 Dec 2018
Posts: 2

I'm new with IIB and I'm mostly doing tutorials at the moment. In the tutorials from IBM Training, they use a Database/Compute Node together with ESQL to interact with databases, while in the tutorials from IBM BetaWorks, they use the Mapping Node to do the same.

What is the preferred way of interacting with databases in IIB?
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Vitor
PostPosted: Thu Dec 06, 2018 5:53 am Post subject: Re: Preferred way of accessing a database in IIB10 Reply with quote

Grand High Poobah

Joined: 11 Nov 2005
Posts: 25365
Location: Ohio, USA

leao wrote:
What is the preferred way of interacting with databases in IIB?


The one that best fits your design.

Seriously.

If you've elected to use a Mapping node, there's no reason why you should add a Compute node or an ESQL function just to get a return set. Likewise if you're writing ESQL there's no point adding a Mapping node just to get to a database.

The only time you might find yourself drawn one way or the other is if you have a seriously complex SQL query that's cumbersome to express in a Mapping node. But I would put it to you that firstly, with data that complex you might be inclined to avoid the Mapping node anyway and secondly, complex SQL queries should be put in stored procedures irrespective of how they're invoked.
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leao
PostPosted: Thu Dec 06, 2018 6:04 am Post subject: Reply with quote

Newbie

Joined: 06 Dec 2018
Posts: 2

How do I know which best fits my design? It's this "election process" that confuses me. I can't seem to find any information on which situations I should use one or the other.

I guess I'm asking for a brief comparison of the strengths and weaknesses of the Mapping node versus the Database and Compute nodes?
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fjb_saper
PostPosted: Thu Dec 06, 2018 6:09 am Post subject: Reply with quote

Grand Poobah

Joined: 18 Nov 2003
Posts: 19826
Location: LI,NY

leao wrote:
How do I know which best fits my design? It's this "election process" that confuses me. I can't seem to find any information on which situations I should use one or the other.

I guess I'm asking for a brief comparison of the strengths and weaknesses of the Mapping node versus the Database and Compute nodes?

Go back to your design board, look at the examples and understand that even though all 3 nodes access the database they fulfill a different purpose.

The Mapping node can access a DB to supplement the mapping of the message.

The compute node is the most flexible as you can deal with the DB return as you wish.

The Database node fills a certain need that is clearly shown in the examples.

Have fun
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