[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: Early Draft Review: XQuery for Java (JSR 225)
> > The issue is relevant to ad hoc queries but it's moot for > > repetitive queries > > That statement confuses me, and not only because Americans appear to use the > word "moot" in the opposite of its original English sense of "arguable". > > The benefit of a string interface is that it gives looser coupling between > systems. The benefit of a custom syntax/protocol is that it gives earlier > validation. The experience of the last few years is that loose coupling > tends to win, across most application scenarios. Hence XML. My comment was the argument about "strings or not" is moot (as in "deprived of practical relevance") when we're talking about stored queries -- as opposed to ad hoc, single-execution queries. For single-execution queries, the XQJ client program passes the query string to the driver for each execution of the query (or the abstract syntax tree alternative). For repetitive, stored queries, we don't pass a string each time so we don't parse the query repetitively. We parse it once, and on subsequent executions of the query, we pass execution time parameters. > The benefit of a custom syntax/protocol is that it gives earlier validation. In the case of [JDBC | XQJ], we can use strings and delegate validation to the [SQL | XQuery] engine. We can use prepared statements (JDBC) or prepared expressions (XQJ) as a separate, distinct process before we execute a query. That gives us pre-execution validation and exception checking. (Pre-execution in this context is a reference to query execution, not program execution.) ======== Ken North =========== www.WebServicesSummit.com www.SQLSummit.com www.GridSummit.com ----- Original Message ----- From: "Michael Kay" <michael.h.kay@n...> To: "'Ken North'" <kennorth@s...>; <xml-dev@l...> Sent: Tuesday, June 29, 2004 1:21 AM Subject: RE: Early Draft Review: XQuery for Java (JSR 225) > > > The issue is relevant to ad hoc queries but it's moot for > > repetitive queries, > > such as for generating a monthly publication. > > That statement confuses me, and not only because Americans appear to use the > word "moot" in the opposite of its original English sense of "arguable". > > The benefit of a string interface is that it gives looser coupling between > systems. The benefit of a custom syntax/protocol is that it gives earlier > validation. The experience of the last few years is that loose coupling > tends to win, across most application scenarios. Hence XML. > > Michael Kay > > > ----------------------------------------------------------------- > The xml-dev list is sponsored by XML.org <http://www.xml.org>, an > initiative of OASIS <http://www.oasis-open.org> > > The list archives are at http://lists.xml.org/archives/xml-dev/ > > To subscribe or unsubscribe from this list use the subscription > manager: <http://www.oasis-open.org/mlmanage/index.php>
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