Coding for DB connect

Hi All,
I am new to SAP BW and trying to gather as much as I can when reading topics and looking to you all to gather the knowledge.
Can anyone tell me what is the ABAP code that needs to be put in place for DB connect. I am aware of the procedure , but have no idea of the preparation that needs to be done in BW and also the ABAP code that needs to be done.
Thanks in advance
Amit

it's very simple :
RSA1 -> SourceSystems -> right window RMB on SourceSystems -> Create ... -> Databasesystems -> type in the qualifier for your systemj in BW
On the next screen you can choose your Databasesystem and your User.
Type in the PIN twice and then the connection-Info, depending on your DBMS, b.e. for an ORACLE-System type in your Database-Connection you want out of your TNSNAMES.ORA.
Select afterwards your table/view, create a DataSource. Voilá, that's all.
A little hint. Don't forget synchronizing your connection on all your Systems (DEV, QAS, PRD), otherwise you'll waste a lot of time searching for this completely superfluos bug
Bye
Ralf

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