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| JohnRodey |
 Posted: Mon Oct 01, 2007 12:27 pm Post subject: JMS Selectors and SQL syntax |
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Centurion
Joined: 13 Apr 2005
Posts: 103
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Since JMS selectors are based on SQL92 is there a package/class that you can load a selection string into and use getters/setters to modify?
For instance say I had a selector of MyRequestorName='Bob' AND MyRequestorID='1234'. Is there a package out there that will allow me to load that string into the constructor and let me call something to the effect of getFilterFields(), which would return MyRequestorName and MyRequestorID?
I am basically looking for a sql parser that can tell the difference between fields, conditions(AND,OR,NOT) and values. |
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| fjb_saper |
| Posted: Mon Oct 01, 2007 2:09 pm Post subject: |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY
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A JMS message is not a DB table.
Be careful what you wish for, and grateful about what you are being offered.
Read more about JMS, Selectors and the performance caveats....
This seems to be more suited to a broker than a JMS selector...
Enjoy 
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| jefflowrey |
| Posted: Mon Oct 01, 2007 2:10 pm Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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Of course you'd need Message Broker to make this viable as a subscription option. The built in MQ pub/sub broker won't filter on content and neither will Event Broker.
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I am *not* the model of the modern major general. |
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| JohnRodey |
| Posted: Mon Oct 01, 2007 2:26 pm Post subject: |
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Centurion
Joined: 13 Apr 2005
Posts: 103
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The question I'm asking is more of a straight JMS question, not necessarily a WebSphere MQ JMS question. And I am not writting a query. But the JMS Spec says that selectors are based off of SQL92 syntax. So is there a helper class that you knwo of that will return to me only the fields from my sql string. Kind of like XmlBeans treat an XML string like an object, I want to be able to treat a SQL string like one.
Any ideas? |
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| jefflowrey |
| Posted: Mon Oct 01, 2007 2:36 pm Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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I'm not aware of any general purpose SQL syntax tokenizer. Or something to marshal/unmarshall SQL into java objects. It's not clear at all that there's anything nearly as deterministic about SQL<->Java as there is XML<->Java..
XML tends to describe data. SQL tends to describe, umm, not data.
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| fjb_saper |
| Posted: Mon Oct 01, 2007 2:41 pm Post subject: |
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Grand High Poobah
Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY
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And remember that the Message Selector (JMS) only works on the message's properties not on the message content...
Enjoy
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