Redis - Sorted set, find item by property value -


in redis store objects in sorted set. in solution, it's important able run ranged query dates, store items score being timestamp of each items, example:

#   score   value 0   1443476076  {"id":"92","ref":"7adt","dtime":1443476076,"atime":1443901554,"extime":0,"spname":"7adt33cfsau6","stpname":"7adt33cfsau6"} 1   1443482969  {"id":"11","ref":"dajt","dtime":1443482969,"atime":1443901326,"extime":0,"spname":"dajtjtt4t02o","stpname":"dajtjtt4t02o"}

however, in other situations need find single item in set based on it's id. know can't query data structure if nosql db, tried using zscan, didn't work.

zscan myset 0 match id:92 count 1

it returns; "empty list or set"

maybe need serialize different? have serialized using json.net.

how, if possible, can achieve this; using dates score , still able lookup item it's id?

many thanks,

lars

edit:

assume it's not possible, thoughts or inputs welcome:

ref: http://openmymind.net/2011/11/8/redis-zero-to-master-in-30-minutes-part-1/

in redis, data can queried key. if use hash, can't me keys wherever field race equal sayan.

edit 2:

i tried do:

zscan myset 0 match *87*  127.0.0.1:6379> zscan myset 0 match *87* 1) "192" 2) 1) "{\"id\":\"64\",\"ref\":\"xqh4\",\"dtime\":1443837798,\"atime\":1444187707,\"extime\":0,\"spname\":\"xqh4bpgw47fm\",\"stpname\":\"xqh4bpgw47fm\"}"    2) "1443837798"    3) "{\"id\":\"87\",\"ref\":\"5cy6\",\"dtime\":1443519199,\"atime\":1444172326,\"extime\":0,\"spname\":\"5cy6dhp23rxb\",\"stpname\":\"5cy6dhp23rxb\"}"    4) "1443519199"

and finds desired item, finds 1 occurance of 87 in property atime. having more unique, longer ids might work way , have filter results in code find 1 exact value in property.

still open suggestions.

i think it's simple.

solution 1(inferior, not recommended)

your way of zscan myset 0 match id:92 count 1 didn't work out because stored string "{\"id\":\"92\"... not "{\"id:92\".... string has been changed format. try use match id\":\"64 or match json serialized data in redis. i'm not familiar json.net, actual string leaves discover.

by way, have ask did zscan myset 0 match id:92 count 1 return cursor? suspect used zscan in wrong way.

solution 2(better, recommended)

zscan when sorted set not large , know how save network roundtrip time redis' lua transaction. still make "look id" operation o(n). therefore, better solution change data model in following way:

change sorted set from

#   score   value 0   1443476076 {"id":"92","ref":"7adt","dtime":1443476076,"atime":1443901554,"extime":0,"spname":"7adt33cfsau6","stpname":"7adt33cfsau6"} 1   1443482969 {"id":"11","ref":"dajt","dtime":1443482969,"atime":1443901326,"extime":0,"spname":"dajtjtt4t02o","stpname":"dajtjtt4t02o"}

to

#   score   value 0   1443476076 id:92 1   1443482969 id:11

move rest detailed data in set of hashes type keys:

#   key   field-value field-value ... 0   id:92 ref-7adt dtime-1443476076 ... 1   id:11 ref-7adt dtime-1443476076 ...

then, locate id doing hgetall id:92. ranged query date, need zrangebyscore sortedset mindate maxdate hgetall every id 1 one. you'd better use lua wrap these commands in 1 , still super fast!

data in nosql database need organized in redundant way above. may make usual operation involve more 1 commands , roundtrip, can tackled redis's lua feature. recommend lua feature of redis, cause wrap commands 1 network roundtrip, executed on redis-server side , atomic , super fast!

reply if there's don't know


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