Have you looked at using the fn:trace() or xdmp:trace() functions and filtering
the log on the event name?
If you called fn:trace() like this:
fn:trace( "This is my application's message", "MyApplication")
It writes an entry to ErrorLog.txt that looks like this;
2010-03-10 08:26:49.605 Info: [Event:id=MyApplication] This is my
application's message
It's then easy to read the ErrorLog.txt and return the lines with your
particular event name ("id=...").
Here is a function that can be used to read any of the logs and return the last
"$maxentries" that contain the event name:
declare function readLog($filename as xs:string, $maxentries as xs:integer,
$event as xs:string)
as xs:string*
{
try {
(: We need to restrict reading of logs to the Log
directory or this becomes an open door
to read any file on the host file system. :)
if (fn:contains($filename, "/") or
fn:contains($filename, "\"))
then fn:concat("Error: Invalid Log name specified: '",
$filename, "'")
else (
let $pathsep := if
(xdmp:platform()="winnt") then "\" else "/"
let $logdir :=
fn:concat(xdmp:data-directory(), $pathsep, "Logs", $pathsep)
let $logfile := fn:concat( $logdir,
$filename)
let $content :=
xdmp:filesystem-file($logfile)
(: split the output into individual entries
:)
let $entries :=
if
($event eq "")
then
fn:tokenize($content,"\n")
else
fn:tokenize($content,"\n")[fn:contains(., $event)]
let $i := fn:count($entries)
let $first := fn:max( (1, $i -
$maxentries) )
return $entries[$first to fn:last()]
)
}
catch ($e) {
fn:concat("Exception thrown reading log: ",
$e/error:format-string/text() )
}
};
Note that if you pass an empty event name it will return the last entries of
the log file.
If you wrap your message in an element name like this:
declare function logInfo($evtid as xs:string, $values as item()*)
as item()*
{
let $msg := element message { $values }
return fn:trace( $msg, $evtid )
};
Use xdmp:unquote() on the <message> after the event string and you have all the
power of XQuery for further processing.
Let me know if that helps.
Keith L. Breinholt
breinhol...@ldschurch.org<mailto:breinhol...@ldschurch.org>
From: general-boun...@developer.marklogic.com
[mailto:general-boun...@developer.marklogic.com] On Behalf Of isa ran
Sent: Wednesday, March 10, 2010 7:57 AM
To: general@developer.marklogic.com
Subject: [MarkLogic Dev General] working with .txt file in MarkLogic
Hi,
Can we load and update a .txt file using MarkLogic/generic xquery functions in
Marklogic?
Something similar to a ErrorLog.txt and using xdmp:log()......
to be specific a customized log file for the application rather than using the
ErrorLog.txt.
I don't mind if the .txt file is in the filesystem or the Marklogic database.
Thanking you,
isa.
NOTICE: This email message is for the sole use of the intended recipient(s)
and may contain confidential and privileged information. Any unauthorized
review, use, disclosure or distribution is prohibited. If you are not the
intended recipient, please contact the sender by reply email and destroy all
copies of the original message.
_______________________________________________
General mailing list
General@developer.marklogic.com
http://xqzone.com/mailman/listinfo/general
