KVS

INTRO

This module is used to manage different KV backends to your cloud of Erlang apps. This is an unified abstraction layer to several databases: redis, mongo, mnesia, riak, aerospike.

dir/0 — table list.

ver/0 — KVS version.

seq/2 — generate new sequence id for table.

count/1 — records in table.

put/1 — put record using element 2 as key.

get/2 — get record by key from table.

delete/1 — delete record from table.

index/3 — index by field and its value.

You can change backend by setting application env. This behaves well on


 application:set_env(kvs,dba,store_mnesia).

RECORDS

KVS CORE


    #ok { data= [] :: term() }.

 #error { data= [] :: term() }.

   #cur { id=   [] :: term(),
          top=  [] :: [] | integer(),
          bot=  [] :: [] | integer(),
          dir=   0 ::  0 | 1,
          reader= [] :: [] | tuple(),
          writer= [] :: [] | tuple(),
          left=  0 :: integer(),
          right= 0 :: inetegr() }.

  #iter { id=   [] :: [] | integer(),
          prev= [] :: [] | integer(),
          next= [] :: [] | integer()).

id — Unique key of the cursor.

CONFIG

In sys.config you should specify kvs backend and list of modules containing metainfo/0 exported function.


  [{kvs, [{dba, store_mnesia},
          {schema, [kvs]} ]}].

This module may refer to: mnesia, kvs_stream.