- users-list - monetdb.org

Re: [MonetDB-users] Using MonetDB / XQuery with PHP
by Menno Holtkamp 12 Dec '06

12 Dec '06

[snip] > I see. This is probably because the default XQuery output is a wee bit > different. ;) I might be able to fix monetdb_php to support XQuery like > JDBC does. Unfortunately I don't have too much time this and next week, > so the fix will have to wait a bit. I'll try and see in the weekend if > I can easily fix it. Did somebody already found some spare time to have glance at the PHP support for XQuery? I'm using a quite dirty hack to get it working right now... Cheers

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by authored Leo 11 Dec '06

11 Dec '06

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by desire ea 07 Dec '06

07 Dec '06

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[MonetDB-users] transaction concurrency
by Ronald Oussoren 05 Dec '06

05 Dec '06

Hi, I'm using monetdb's SQL frontend through the python bindings (with minor patches to make it behave more like the DB-API specifies, and a patch to print error information because MonetSQLdb raises 'RuntimeError, None' when the database returns an error). I'm now running into yet another problem: I have an import process that imports large sets of records in a single transaction per dataset. This works fine (after fixing some problems in my code). However, when I perform other transactions during an "import" transactions the import tranaction fails hard even if those transactions only read from the database and only touch tables that aren't touched by the import script. I'm not at my development machine at the moment, but I'll post an example script and the exact error I'm getting when I'm back. Ronald P.S. This is using a recent build of a daily snapshot from the 2.14/4.14 branch.

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[MonetDB-users] cfourses zcourses czourses
by vjrus 04 Dec '06

04 Dec '06

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[MonetDB-users] Bulk load error in Windows 2000
by JLP00993＠correo.aeat.es 01 Dec '06

01 Dec '06

1 0

[MonetDB-users] Bulk load
by JLP00993＠correo.aeat.es 30 Nov '06

30 Nov '06

5 6

Re: [MonetDB-users] About Static Type Analysis for XQuery in MonetDB/XQuery
by Jens Teubner 29 Nov '06

29 Nov '06

On Wed, Nov 29, 2006 at 08:40:59PM +0800, Wang Zhen (Selina) wrote: > As you said, your work "goes beyond the actual requirements in the W3C > specs", is it because in some aspect, the requirements in the W3C > specs is not enough? Or, is it because the implementation of W3C > specs are difficult or cause some problems? When the development of Pathfinder started, it had not yet been clear what kind of subtype relationship the XQuery language would use. For quite a while, the W3C drafts depended on /structural subtyping/, which (computationally) is much more expensive than the /named typing/ that you find now in the W3C documents. The XML structure leads to tree-structured types. The structural subtype relationship is now decided by looking at the full structure of both types and testing, whether each instance of the one type will always be an instance of the other type. Example: Consider the two types t1 := element a { element b { item* } } t2 := element a { element b { item* }, element c { item* }? } (that is, an element `a' with a single `b' child of arbitrary content, and an element `a' with a `b' and an optional `c' element in its content) In this example, each instance of type t1 will always be an instance of type t2, thus t1 <: t2. Testing this relationship can be quite expensive, which probably is why structural typing didn't make it into the current Candidate Recommendation of the specs. These specs now use named typing. Here, it is assumed that items are annotated with a type /name/ and that there is a hierarchy (the derivation hierarchy) between type names. To test a subtype relationship, one only has to look at the two names now, but /not/ at their full structure. The Pathfinder compiler includes a full implementation of a structural subtype algorithm (we use the one described in [1,2]). In some occasions, this allows the inference of a more precise type information. Our system does not yet include validation support, but we expect that the structural type information can help to avoid an expensive validation if we can statically derive that validation will succeed. > Besides, do you provide a formal document, or any tutorials about the > actual static typing you have achieved? Sorry, but we haven't. You find the subtype algorithm we use in the references below. Our inference rules more or less follow the W3C specs, though the implementation needs quite some work. Regards, Jens [1] Martin Kempa, Volker Linnemann. Type Checking in XOBE. BTW 2003. [2] Martin Kempa. Programmierung von XML-basierten Anwendungen unter Berücksichtigung der Sprachbeschreibung. PhD thesis, U Lübeck, Germany, 2003. -- Jens Teubner Technische Universitaet Muenchen, Department of Informatics D-85748 Garching, Germany Tel: +49 89 289-17259 Fax: +49 89 289-17263 No scientist is ever right, they just can't be proved wrong at the time! -- Richard Feynman

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[MonetDB-users] appealed
by TFTP Edit 29 Nov '06

29 Nov '06

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[MonetDB-users] Connecting to iSQL-Viewer
by JLP00993＠correo.aeat.es 29 Nov '06

29 Nov '06

2 1