JCO Connection

[Former Member]

Hi Experts,

We use two types of JCo connections while connecting to back-end .

1 . Modeldata

2 . Metadata

What is the use of each type of JCO connection ?

Thanks a lot .

[Former Member · Accepted solution]

hi,

Mainly,

WD_MODELDATA_DEST is for application data

WD_RFC_METADATA_DEST is about metadata(data about data).

For more information please refer to:

[http://help.sap.com/saphelp_nw70/helpdata/EN/44/45a04028f40160e10000000a1550b0/frameset.htm]

regards,

pinki

[nikhil_bose]

Dictionary metadata:

Contains the dictionary structure, that is the data about data

such as structures, data types which are used in the RFC

The connection is always Load-balanced since we need Logon group in R/3

And it needs Messageserver of R/3

Application data:

It retrievs the actual content of the RFC.

can be Load-balanced as well as Single server.

For e.g. We can say model data is the data coming through the table where as the metadata is the structure of table

regards,

nikhil

[Former Member]

Hi jain,

I think you have posted some wrong part in your post.

There no two type of JCo Connections; but you can create one JCo connection and specify different parameters to it; one is model data and other is meta data.

model data - shows the default logical system name for model instances that we use in application.

meta data - shows the default logical system name for RFC metadata (Backend R3 meta data).

and both together forms the JCo Connection for the WebDynpro Front-end application.

You can find more idea by login to ContentAdministrator and find your application name and view.

Regards

- Vinod

*

Edited by: Vinod V on Apr 3, 2008 10:20 AM

[Former Member]

Hi,

Its a connectivity between Java And SAP system.

These JCO Desinations will be maintained in Content Administrator.

In Content Adminstrator->Maintain JCO Destinations:we can find the perticular SAP system(EX:HR system) connected.So that it will directly talk to SAP R/3.

MetaData wiil gives the information to execute the model.

Modeldata:Gives the information about application.

Regards,

lavanya

[Former Member]

Hi

Purpose of JCO is

1)Java cannot able to directly communicate with SAP

2)That's why JCO's r used to provide the communication between java and SAP

3)In java we use JDBC API to communicate with database, like this we use jco's in SAP.

Regards

Hazrath