[SR-Users] how to match exact string value in mtree (Uri Shacked)

[Daniel-Constantin Mierla]

Hello,

On 2/16/12 2:51 PM, Javier Gallart wrote:
> Hello Uri
>
> I had similar needs and I found the ndb_redis module more suited for 
> that type of task. Instead of a tree you have a hash like this: tname 
> tprefix tvalue. If you do a hget nts $avp(DID) and you get a not null 
> value you have found your exact match. It works very  well for me and 
> the time it takes for that "query" is barely noticeable. Of course 
> redis does not address items like persistence, etc the same way a 
> rdbms does.

for hash tables in config, the alternative is using htable module. Then 
the selection is done on exact match, no prefix matching. mtree is 
suitable for storing keys that are composed from a limited set of 
characters (like numbers, 0-9 digits only), otherwise becomes too memory 
consuming. For keys that are composed from any character and need exact 
match, hash table structures are more suitable, no matter if it is via 
htable module or something else like redis.

Cheers,
Daniel

> Hope it helps.
>
> Regards
>
> Javi
>
> On Thu, Feb 16, 2012 at 12:00 PM, 
> <sr-users-request at lists.sip-router.org 
> <mailto:sr-users-request at lists.sip-router.org>> wrote:
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>       1. how to match exact string value in mtree (Uri Shacked)
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>     ----------------------------------------------------------------------
>
>     Message: 1
>     Date: Thu, 16 Feb 2012 12:54:50 +0200
>     From: Uri Shacked <ushacked at gmail.com <mailto:ushacked at gmail.com>>
>     Subject: [SR-Users] how to match exact string value in mtree
>     To: "SIP Router - Kamailio (OpenSER) and SIP Express Router (SER) -
>            Users   Mailing List" <sr-users at lists.sip-router.org
>     <mailto:sr-users at lists.sip-router.org>>
>     Message-ID:
>     <CAMMbDhTFNXAE-K88=AeMjO7AnA_QJV3Ajj3AH-AxemXN3ze6HQ at mail.gmail.com <mailto:AeMjO7AnA_QJV3Ajj3AH-AxemXN3ze6HQ at mail.gmail.com>>
>     Content-Type: text/plain; charset="iso-8859-1"
>
>     Hi,
>
>     I am using Mtree to match prefix numbers, some of them starts with
>     0 or
>     characters like D for example.
>     so, the mtree param is like this:
>
>     modparam("mtree", "db_url", CFGDB)
>     modparam("mtree", "mtree",
>     "name=nts;dbtable=service_numbers_view;type=0;")
>     modpmodparam("mtree", "char_list", "0123456789*+#YMDabcdefgh")
>     modparam("mtree", "pv_value", "$avp(mtval)")
>     modparam("mtree", "pv_values", "$avp(mtvals)")
>
>     The thing is, that i tried all:
>
>     if(!mt_match("nts", "$avp(DID)","1"))
>     if(!mt_match("nts", "$avp(DID)","2"))
>     if(!mt_match("nts", "$avp(DID)","0"))
>
>     and lets say i have the both prefix in the nts mtree:
>     09555
>     09555333
>
>     And the prefix i search for is  $avp(DID)=09555444
>
>     I allwasy get the 09555 because it is the longest match.
>     I need exact match.....
>
>     how do i do that?
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-- 
Daniel-Constantin Mierla -- http://www.asipto.com
http://linkedin.com/in/miconda -- http://twitter.com/miconda

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