[MarkLogic Dev General] About hash map function

[Ryan Grimm]

Hi Rashid,

In XQuery, the current-dateTime() function will always return the same 
value during the execution of the query.  To see this in action try 
executing this query:

current-dateTime(),
xdmp:sleep(5000),
current-dateTime()

You'll see that result of current-dateTime() is the same for both calls 
even though there was a sleep in there for 5 seconds.

If you're looking for a unique value for some id's you could probably 
use xdmp:random() to generate an unsigned 64bit integer.  While there is 
a small possibility of xdmp:random() returning the same value twice, the 
  same potential problem exists for xdmp:hash64().

Hope that helps.

--Ryan


Nizamuddin, Rashid wrote:
> Could anybody please tell me why I am not getting a unique value when I 
> execute this loop
> 
> *let $cnt := 1 to 5*
> 
> *for $c in $cnt*
> 
> *return *
> 
> *    let $str := xdmp:hash64(string(current-dateTime()))*
> 
> *    return $str*
> 
> * *
> 
> *for each iteration I get the same value. I need to get a unique value 
> to insert in some ids elements.*
> 
> * *
> 
> *Any help will be appreciated*
> 
> * *
> 
> *Rashid*
> 
> * *
> 
> 
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