Answer / ashwin urkude

Their are 2 types of BDC Method:
1) CALL TRANSACTION.
2) SESSION .

1: CALL TRANSACTION : In this method you Call a Transaction
as 'MB01' and Process the Recorded BDC RUNTIME.
You can RUN this BDC in following Modes:

MODE A: FOREGROUND MODE(You will be able to View SCREEN
calling and fiiling of data in respective fields of that
very SCREEN).

MODE E: ERROR MODE(Everthing in Background. If any ERROR
occurs your BDC will STOP on that very SCREEN where ERROR
occured.)

MODE N: BACKGROUND(Processing of BDC is done in
Background. If any ERROR occurs the BDC will not get
executed further & you are thrown out of BDC.)
-----------------------************------------------------

2: SESSION METHOD :- Here for whatever BDC you have RECORDED
a SESSION(LOG) is CREATED where the BDC is STORED and it
gets Executed when you Execute the LOG through TRANSACTION
SM35. to View the OUTPUT use TRANSACTION SM39.
This is basically done when you are dealing with large
amount of data in your Internal Table. We use 3 Function
Modules .

BDC_OPEN_GROUP : To open the group.
BDC_INSERT : To Insert Transaction.
BDC_CLOSE_GROUP: Closes the Transaction.

SESSION METHOD IS THE BEST.

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