Re: [Boost-users] Backend of multi_index container

Subject: Re: [Boost-users] Backend of multi_index container
From: anaswara (anaswara.nn_at_[hidden])
Date: 2016-06-25 23:24:19

I have 7 fields in each record,two strings and five 64 bit integers. Of these,one of the integers is unique. I need to store all such records into the DB. In multi-index, I have a structure and this structure is being indexed by that integer value. If I have to similarly create a structure and store it as the value in LMDB, then what is its difference from multimap? I can do the same in multimap also. Then how does LMDB become a database.

Sent from Samsung Mobile

-------- Original message --------
From: degski <degski_at_[hidden]> 
Date: 24/06/2016  7:43 PM  (GMT+05:30) 
To: boost-users_at_[hidden] 
Subject: Re: [Boost-users] Backend of multi_index container 
 
On 24 June 2016 at 15:51, Anaswara Nair <anaswara.nn_at_[hidden]> wrote:
I have gone through LMDB. However AFAIK LMDB stores the data as a key-value pair.

Yes, it's a key-value store.
 
 Though duplicate keys are allowed, I couldn't find any relation between these entries. I couldn't understand its use as a database as well.

It's like std::(multi)map, maybe the wikipedia entry helps.
 
Can you provide some help so that I can go deeper into this.

In your original question, you refer to having one unique ID and some related data per record. Maybe you could expand a bit on what you would like to achieve.

degski