Good summary as always Gert.
Just one correction; you can create directories with a call to
xdmp:filesystem-directory-create() like this:
xdmp:filesystem-directory-create( $dir,
<options xmlns="xdmp:filesystem-directory-create">
<create-parents>true</create-parents>
</options>
)
This will create the directory path specified in $dir and all parent
directories if they don't already exist.
NOTE: xdmp:filesystem-directory-create is not [yet] a supported function but if
it was removed from the xdmp library MarkLogic would have to rewrite their
admin interfaces.
Keith L. Breinholt
ICS Content & Media
[email protected]<mailto:[email protected]>
-----Original Message-----
Message: 6
Date: Fri, 11 Sep 2009 13:09:45 +0200
From: Geert Josten <[email protected]>
Subject: RE: [MarkLogic Dev General] Operating system call from Xquery
To: General Mark Logic Developer Discussion
<[email protected]>
Message-ID:
<0260356c6dfe754ba6fa48e659a1433833364bf...@helios.olympus.borgus.nl>
Content-Type: text/plain; charset="Windows-1252"
Hi Chetan,
Sorry for the late reply.
> Is there a way to make system call from xquery like move
> files from one directory to another, call shell scripts etc?
MarkLogic has some filesystem functions. You can use xdmp:filesystem-directory
to get file listings, use xdmp:filesystem-file to read a file as plain text,
use xdmp:document-get/insert to get text, binary or xml and insert into the
database (or use xdmp:document-load to do both in one call), and use xdmp:save
to write information back to the file system.
A description of these functions can be found here:
http://developer.marklogic.com/pubs/4.1/apidocs/All.html
There is however no way to delete files or folders, nor a way to create
directories that way. To my knowledge it is not possible to do system-calls
from Xquery either, but you can delegate such tasks to a second webservice is
you like. You could use MLJAM for that, but you have to consider security when
taking this approach. More on MLJAM can be found here:
http://developer.marklogic.com/code/
You might like to consider putting a Java-layer (or .Net-layer) between
MarkLogic Server and the front-end. Then you can do filesystem stuff in there
and do only database things in xquery.
> Can MarkLogic pull data from FTP site?
To my knowledge, no. But you could do that in the Java-layer as well. It can
retrieve content through HTTP(S) though, perhaps that is a suitable alternative?
Kind regards,
Geert
Drs. G.P.H. Josten
Consultant
http://www.daidalos.nl/
Daidalos BV
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