Dear Jennie,
Thank you for your explanation. Do you know if it is possible to delete
a document from the db-farm? Since when I try to simply overwrite the
old file by doing a new put-statement with another XML-element with the
same name, MonetDB crashes with a segmentation-fault when doing a new
get-statement for the same file.
In short:
cq:PUT("tmp/test.xml",<bla/>)
// no problem
cq:GET("tmp/test.xml")
// returns <?xml version="1.0" encoding="utf-8"?><bla/>
cq:PUT("tmp/test.xml",<bladiebloe/>)
// no problem (it seems)
cq:GET("tmp/test.xml")
// Segmentation fault
I checked the db-farm directory and after the crash it does contain:
<?xml version="1.0" encoding="utf-8"?><bladiebloe/>
So that seems to be OK.
Thank you for your help.
Best regards,
Arthur
Ying Zhang wrote:
> Hi Arthur,
>
> with PUT, your node is serialized to disk, in the file
> "<dbfarm>/<db>/tmp/test.xml"
> it is not shredded at all, you can see this by using xmldb_print() in a
> Msever console. So the problem seems to be caused by that _del_doc does
> not recognize a document that is stored on disk but not shredded...
>
>
> Jennie
>
>
> On Wed, Mar 07, 2007 at 09:18:31PM +0100, Arthur van Bunningen wrote:
>
>> Dear All,
>>
>> To be able to create a soap-interface with support for the dynamic
>> management of xml documents I created a XQuery module with some simple
>> document management functions, which I stole from
>> "pathfinder/runtime/xrpc/admin/admin.xq" (the code is found at the end
>> of this mail).
>>
>> To test the functions without soap, I created tree simple xqueries. Now
>> adding and displaying documents works perfectly. However, when I want to
>> delete a document I get: "ERROR = !ERROR: _del_doc(tmp/test.xml):
>> document not found in database (1 such errors)! !ERROR:
>> interpret_params: shred_doc_base(param 1): evaluation error.".
>>
>> Maybe this is because the document is not shredded in an ordinary way,
>> however I do not know of any other function that can insert documents
>> without a physical location.
>>
>> If someone could help me to delete these documents, or point me to
>> another way of inserting documents without a physical location (, or
>> show me the stupid mistake I made :) ), this would be very much appreciated.
>>
>> Best regards,
>>
>> Arthur
>>
>>
>>
>>
>> The module looks as follows:
>> ==========================
>> module namespace cq = "http://db.cs.utwente.nl/cq#";;
>> declare updating function cq:PUT($uri as xs:string, $doc as element())
>> {
>> if (substring($uri, 1,4) = 'tmp/')
>> then put($doc, $uri)
>> else error('PUT: only relative URIs starting with tmp/ allowed')
>> };
>>
>> declare function cq:GET($uri as xs:string)
>> { doc($uri) };
>>
>> declare document management function cq:DELETE($uri as xs:string)
>> {
>> if (substring($uri, 1,4) = 'tmp/')
>> then pf:del-doc($uri)
>> else error('DELETE: only relative URIs starting with tmp/ allowed')
>> };
>>
>> ==========================
>> The three test files look as follows:
>> ==========================
>> import module namespace cq = "http://db.cs.utwente.nl/cq#"; at
>> "/home/db/bunninge/phd/implementation/xquery/try3_module/ca_module.xq";
>> cq:PUT("tmp/test.xml",<bla/>)
>> ==========================
>> import module namespace cq = "http://db.cs.utwente.nl/cq#"; at
>> "/home/db/bunninge/phd/implementation/xquery/try3_module/ca_module.xq";
>> cq:GET("tmp/test.xml")
>> ==========================
>> import module namespace cq = "http://db.cs.utwente.nl/cq#"; at
>> "/home/db/bunninge/phd/implementation/xquery/try3_module/ca_module.xq";
>> cq:DELETE("tmp/test.xml")
>>
>>
>>
>>
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