topic Re: Model driven architecture in QlikView

Model driven architecture

Tue, 18 Feb 2014 05:36:56 GMT

Hi,

Is there someone developing with a model driven architecture (MDA)? How far are you? did you find some limits due to the tool?

Am I alone on that subject??

I will be happy to share with people working on that.

Eva

Re: Model driven architecture

Tue, 18 Feb 2014 08:11:15 GMT

What do you mean MDA? Developing in the sense of setting up an application layer, a data layer and then feeding that into a QVW? So a proper architecture for enterprise deployments?

Re: Model driven architecture

datanibbler — Tue, 18 Feb 2014 08:24:16 GMT

Hi Byron and Eva,

if it is so (like Byron suggested), then I'll be happy to also do my little part in being unhelpful 😉

In our company, the architecure is three-tier:

- First comes a qvw without GUI, loading data from the Database and saving qvd_files.

=> Then comes a "DataModel" that loads all the qvd_files and builds a data_model

=> That is then loaded (BINARY) into (most of) the apps.

Best regards,

DataNibbler

Re: Model driven architecture

sujeetsingh — Tue, 18 Feb 2014 08:26:12 GMT

This term is the same as Byron

Re: Model driven architecture

datanibbler — Tue, 18 Feb 2014 08:33:51 GMT

Hi,

as far as limits - so far I am conscious of only one real limit - well, rather a drawback, not an absolute limit - the size. A data_model of that kind can get huge and especially if people are connected via VPN and open an app using it, that might turn out troublesome.

You can, however - and we have tried that - create several different smaller DataModels, for just a few apps.

One thing we thought of trying, but haven't succeeded with yet, is

=> making a small DataModel that is sufficient for some apps and then

=> loading it BINARY into a secondary bigger DataModel and adding tables as per requirement for other apps.

HTH,

DataNibbler

Re: Model driven architecture

Wed, 19 Feb 2014 00:52:58 GMT

Hi guys,

Sorry I was away!! great to see answers !!Ok, I will try to explain clearly.

My Goal is to be able to load any new source just with a parameter file update.

The script will load a metamodel. The metamodel sctrucure comes from the script, metamodel data comes from the parameter file.

After the script will load all the data.

I did that for a small project. I was working despite I had some conceptualization issues. and It just adapt to the project, not enough general to be usefull.

My points: could we do all operations on this way? do we need to process operations in a special order? if yes, how to find the best order to optimize it? any other limitations?

Re: Model driven architecture

Mon, 24 Feb 2014 00:04:39 GMT

Every one is gone ???

Hooo hoooo !!!

There is echo, this room seems dark and empty, humid... Am I alone, afraid, lonely poor person...??

Re: Model driven architecture

Fri, 28 Feb 2014 08:50:49 GMT

haha dig your humour

Crazy busy at the moment but will try have a look at this post again over the weekend

Cheers,

Byron