Which is better External View OR Database procedure Proxy ?

Hi Jasmin and Kilian,
Creation of External View in HANA and consume in ABAP.
Which is better External View OR Database procedure Proxy.
Regards,
Pravin
Message was edited by: Jens Weiler
Branched from http://scn.sap.com/thread/3498161

Hi Pravin,
that depends on your application logic and use case. There is no general recommendation for one or the other.
If, for instance, you have input parameters, you would go for a DB procedure proxy, since the external view does not allow to pass input parameters from the ABAP to the HANA column view.
On the other hand, if you would like to consume the result in an ALV with integrated data access (the "next generation ALV"), you would rather go for an external view... so - like the answer to so many other questions - it depends... .
Cheers,
Jasmin

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internally we have since some time a discussion on whether one can make external views in ABAP when HANA is your secondary database. According to the documentation it is not possible, but apparently the HANA-versions of Financial transactions do use them. These transactions are SAP standard transactions. It is difficult to convince our users/developers that this is not possible, when they see it is used in SAP standard ...
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You copy/transport your external view to your first ABAP dictionary.
Now you can use it in a SELECT with CONNECTION(“to_2ndary_hana”).
Is this correct? Or do I still miss something?
Thanks for any reaction.
Regard.
Kris
Message was edited by: Jens Weiler

Hi Kris,
except for "The name of the HANA-artefact and the external view in the ABAP dictionary have to be identical" all you points above are valid.
Let me say a couple of words about the external views, especially those delivered by SAP.
Assume you have a development system landscape like DEH (development system with HANA as primary DB), DEO (development system with another DB), QCS (quality system, doesn't matter which DB but receiving the consolidated transports of DEH and DEO), PDS (productive system with non-HANA as primary DB and a secondary DB connection to HANA).
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The described procedure explains how SAP has been able to deliver external views. In our system landscape, we have development systems on HANA as well as systems using non-HANA as primary database - how exactly depends on the product etc. So once the colleagues developed their HANA views and created the external views on such a development system on HANA, we can deliver external views. You can consume these external views:
in a system using HANA as primary database (assuming of course you have also received the correct HANA content and everything has been activated properly)
in a system using HANA as secondary database and using the CONNECTION statement in Open SQL
In scenario 1. you are able to create external views yourself via the ABAP Development Tools, while in the second scenario you can neither view nor maintain the external view.
For database procedure proxies, there is a method to create the DB procedure proxies programatically (see http://scn.sap.com/thread/3498161).
Hope this clarifies your questions,
Cheers,
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user5969983 wrote:
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Subject: Re: SQL Loader or UTL_FILE , Which is better ??
Hey,
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So, for this purpose each time I have to update the control file for 'infile' parameter.
Thats what I said in my second post.
Message was edited by:
Abhijit Deshmukh

Which is better External View OR Database procedure Proxy ?

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