Hi Genneva,
XQuery is a full and sophisticated programming language, so you can do virtually anything you want with it, in particular when it comes to data processing. In other words: Yes, you can parse the results to figure out the contents, etc.
Christian
On Wed, Jul 20, 2016 at 10:29 PM, Wang, Genneva genneva.wang@sap.com wrote:
Hi basex gurus,
Given that inserts can be done in single transaction based on the context below. I’m wondering, if we do bulk retrieval, for example
db:open('testdb', 'abc.xml'),db:open(’testdb', 'xzy.xml')
This returns both content in concatenated results. I’m wondering is there a way to parse the results so there is an easy way to figure out what are the contents for abc.xml and what are the contents for xyz.xml? Any tips would be greatly appreciated. Thanks!
Thanks, Regards, -Genneva
From: basex-talk-bounces@mailman.uni-konstanz.de on behalf of Dirk Kirsten dk@basex.org Date: Thursday, May 19, 2016 at 11:59 PM To: "basex-talk@mailman.uni-konstanz.de" basex-talk@mailman.uni-konstanz.de Subject: Re: [basex-talk] multiple inserts/update/deletes in single transaction
Hello Genneva,
this is expected behaviour. BaseX script executed each command separately. This is by design and required by the nature of XQuery (Update), which by design always executes as one transaction - Which can be difficult do deal with if you have a large amount of data and have to e.g. hold it in memory.
Each XQuery runs in one single transaction, so you can simply add your documents via XQuery, e.g.
db:add("DB", "embedded7.xml"), db:add("DB", "embedded8.xml")
Cheers
Dirk
On 05/19/2016 08:11 PM, Wang, Genneva wrote:
Hi
I’m trying to figure out whether batched transaction would work for basex, and I came across the RUN and EXECUTE command specified in http://files.basex.org/releases/8.4/BaseX84.pdf page 58-59. The document mentioned following in the summary section:
RUN:Evaluates the contents of file as XQuery expression. If the file ends with the suffix .bxs, the file content will be evaluated as command script. This command can be used to run several commands in a single transaction EXECUTE: Evaluates the specified input as command script. This command can be used to run several commands in a single transaction.
I’ve tried this myself For example, I’d like to know if I batch 2 inserts, if one fails, would both inserts get rollback.
I’m using a simple .bxs (attached and also listed below for your convenience) and run the execute using GUI.
OPEN test ADD TO embedded7.xml <root>embedded</root> ADD TO embedded8.xml <root>embedded CLOSE
The second ADD (embedded8.xml) is not a valid xml format so I’m expecting it to fail, and rollback both files if any of them have already added. But after executing this script, I’m seeing embedded7.xml have been added.
Would you be able to confirm if this is the expected behavior ? If so, is there anyway that I can batch multiple inserts and ensures that these batch of files can be committed at the same time, and rollback all together if any of the file has an error ?
Thank you very much for your help.
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