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Re: Streaming XML (WAS: More on taming SAX (wasRe: [xml

• To: Daniela Florescu <dflorescu@m...>
• Subject: Re: Streaming XML (WAS: More on taming SAX (wasRe: ANN: Amara XML Toolkit 0.9.0))
• From: Karl Waclawek <karl@w...>
• Date: Mon, 27 Dec 2004 22:33:33 -0500
• Cc: XML Developers List <xml-dev@l...>
• In-reply-to: <90868458-5878-11D9-A33A-000393DC762C@m...>
• References: <1103757598.10272.67.camel@borgia> <20041223055359.GK25900@s...> <1103791522.4600.68.camel@borgia> <1103792754.4600.81.camel@borgia> <41CB11D1.50600@j...> <20041225094043.GA14697@m...> <41CEFEED.7000802@f...> <20041226200008.GA27205@m...> <EED07622-5841-11D9-A33A-000393DC762C@m...> <41D09826.4000401@w...> <C241CC97-5862-11D9-A33A-000393DC762C@m...> <41D0A93D.5030403@w...> <90868458-5878-11D9-A33A-000393DC762C@m...>
• User-agent: Mozilla Thunderbird 1.0 (Windows/20041206)

Daniela Florescu wrote:
>>  I was quite surprised
>> to lean that some of my queries were significantly
>> easier to understand and write using xBase (index based
>> iterators, linked with other iterstors if necessary)
>> than using SQL.
> 
> 
> !? Com' on Karl.
> 
> If you add/remove an index you have to rewrite your xBase
> application. If the volume of data or the frequency of queries
> changes you gave to rewrite your application. Etc. Etc. Etc.

Just wanted to add: Your queries determine where you need an index,
so if you add/remove an index, there is likely a reason to
change/add/remove a query. That might be quite complicated too.
Or you change your backend - you very likely have to rewrite
quite a few queries - SQL isn't as standardized as it seems.
And that is from experience too.

The best way is to hide your data access specifics
in a separate layer. That's the lesson to learn, not
that one should always use SQL.

Karl

• References:
  • ANN: Amara XML Toolkit 0.9.0
    • From: Uche Ogbuji <uche.ogbuji@f...>
  • Re: ANN: Amara XML Toolkit 0.9.0
    • From: Uche Ogbuji <uche.ogbuji@f...>
  • More on taming SAX (was Re: ANN: Amara XML Toolkit 0.9.0)
    • From: Uche Ogbuji <uche.ogbuji@f...>
  • Re: More on taming SAX (was Re: ANN: Amara XMLToolkit 0.9.0)
    • From: Jeff Rafter <lists@j...>
  • Re: More on taming SAX (was Re: ANN: Amara XML Toolkit 0.9.0)
    • From: Alan Gutierrez <alan-xml-dev@e...>
  • Re: More on taming SAX (was Re: ANN: Amara XMLToolkit 0.9.0)
    • From: Uche Ogbuji <uche.ogbuji@f...>
  • Re: More on taming SAX (was Re: ANN: Amara XML Toolkit 0.9.0)
    • From: Alan Gutierrez <alan-xml-dev@e...>
  • Re: Streaming XML (WAS: More on taming SAX (was Re: ANN: Amara XML Toolkit 0.9.0))
    • From: Daniela Florescu <dflorescu@m...>
  • Re: Streaming XML (WAS: More on taming SAX (wasRe: ANN: Amara XML Toolkit 0.9.0))
    • From: Karl Waclawek <karl@w...>
  • Re: Streaming XML (WAS: More on taming SAX (was Re: ANN: Amara XML Toolkit 0.9.0))
    • From: Daniela Florescu <dflorescu@m...>
  • Re: Streaming XML (WAS: More on taming SAX (wasRe: ANN: Amara XML Toolkit 0.9.0))
    • From: Karl Waclawek <karl@w...>
  • Re: Streaming XML (WAS: More on taming SAX (was Re: ANN: Amara XML Toolkit 0.9.0))
    • From: Daniela Florescu <dflorescu@m...>

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