topic Re: any one please in Application Development and Automation Discussions

any one please

Former Member — Wed, 28 Feb 2007 08:26:41 GMT

what is BDC?

Re: any one please

p291102 — Wed, 28 Feb 2007 08:27:39 GMT

hI,

BDC and LSMW are the two data migration techniques (from legacy to SAP) . BDC technique is usually done by ABAPers. It consists of three methods.

1) Call Dialog Method

2) Session Method

3) Call Transaction Method

In the case of Session Method , a BDC Session is created , which has the data and info to run it in batch mode. When the user runs this session, every transactions are run in batch mode and tables are updated.

WHile in call transaction, no session is created. Instead , a report prog is created , which takes input from the file and calls the transaction in Batch mode.

Call dialog method is similar to call transaction, except that updation is done by the calling program itself.This method is obsolete.

Advantages of Batch Input Method are

1)Can process large data volumes

2) data integrity is maintained

Just check these links.

LSMW and BDC are vastly different.

BDC (Batch Data Communication) is a technology used for data transfer. it is meant for transferring data thru SAP transactions itself. when u use BDC for data transfer, the sequence of steps is the same as when u use standard sap transaction screens for data upload. the only difference is that u can use different options for foreground/backgrou nd processing.

LSMW on the other hand is a tool that helps migrate data from a legacy system (non-sap system ) to SAP system. it offers u various options to use either batch input, direct input, BAPIs or idocs. it involves a series of some 17-18 steps to migrate data.

BDC:

Batch Data Communication (BDC) is the process of transferring data from one SAP System to another SAP system or from a non-SAP system to SAP System.

Features :

BDC is an automatic procedure.

This method is used to transfer large amount of data that is available in electronic medium.

BDC can be used primarily when installing the SAP system and when transferring data from a legacy system (external system).

BDC uses normal transaction codes to transfer data.

Types of BDC :

CLASSICAL BATCH INPUT (Session Method)

CALL TRANSACTION

BATCH INPUT METHOD:

This method is also called as ‘CLASSICAL METHOD’.

Features:

Asynchronous processing.

Synchronous Processing in database update.

Transfer data for more than one transaction.

Batch input processing log will be generated.

During processing, no transaction is started until the previous transaction has been written to the database.

CALL TRANSACTION METHOD :

This is another method to transfer data from the legacy system.

Features:

Synchronous processing. The system performs a database commit immediately before and after the CALL TRANSACTION USING statement.

Updating the database can be either synchronous or asynchronous. The program specifies the update type.

Transfer data for a single transaction.

Transfers data for a sequence of dialog screens.

No batch input processing log is generated.

LSMW:

The LSM Workbench is an R/3-based tool that supports You when transferring data from non-SAP systems ("Legacy Systems") to R/3 once or periodically.

The tool supports conversion of data of the legacy system in a convenient way. The data can then be imported into the R/3 system via batch input, direct input, BAPIs or IDocs.

Furthermore, the LSM Workbench provides a recording function that allows to generate a "data migration object" in an entry or change transaction.

The main advantages of the LSM Workbench:

• Part of R/3 and thus independent of individual platforms

• A variety of technical possibilities of data conversion:

• Data consistency due to standard import techniques:

Batch input

Direct input

BAPIs (Business Application Programming Interfaces)

IDocs (Intermediate Documents)

The import technique to be used in an individual case depends on the business object.

• Generation of the conversion program on the basis of defined rules

• Clear interactive process guide

• Interface for data in spreadsheet format

• Creation of data migration objects on the basis of recorded transactions

• Charge-free for SAP customers and SAP partners

Thanks,

shankar

Re: any one please

Former Member — Wed, 28 Feb 2007 08:28:57 GMT

Hi,

Please refer the link,

/thread/331696 [original link is broken]

Regards,

Hema.

Reward points if it is useful.

Re: any one please

Simha_ — Wed, 28 Feb 2007 08:29:13 GMT

Hi,

The Batch Input is a SAP technic that allows automating the input in transactions. It lies on a BDC (Batch Data Commands) scenario.

BDC functions:

E BDC_OPEN_GROUP : Opens a session group

E BDC_CLOSE_GROUP : Closes a session

E BDC_INSERT : Insert a BDC scenario in the session

E The ABAP statement "CALL TRANSACTION" is also called to run directly a transaction from its BDC table.

It runs the program RSBDCSUB in order to launch automatically the session. The session management is done through the transaction code SM35.

The object itself is maintanable through the transaction SE24.

BDC methods:

Method

Description

Parameters

OPEN_SESSION

Opens a session

SUBRC (Return Code ? 0 OK)

SESSIONNAME (Session to be created)

CLOSE_SESSION

Closes a session

None

RESET_BDCDATA

Resets the BDC Internal Table...

None. Normally, for internal purposec

BDC_DYNPRO

Handles a new screen

PROGNAME (Name of the program)

DYNPRONR (Screen Number)

BDC_FIELD

Puts a value on the screen

FIELDNAME (Name of the field)

FIELDVALUE (Value to be passed)

CONSTRUCTOR

Constructor - Initializes NO_DATA

NODATA (No data character). The constructor is called automatically when the object is created.

RUN_SESSION

Launches a session with RSBDCBTC

None

CALL_TRANSACTION

Calls a transaction with the current BDC Data

MODE (Display Mode)

UPDATE (Update Mode)

TCODE (Transaction to be called)

BDC_INSERT

Inserts the BDC scenario in the session

TCODE (Transaction to be called)

BDC techniques used in programs:

1) Building a BDC table and calling a transaction,

2) Building a session and a set of BDC scenarios and keeping the session available in SM35,

3) Building a session and lauching the transaction right after closing the session.

BDC using Call Transaction

BDC using Call transaction involves calling an SAP transaction in back ground from within the ABAP

program. The process involves building an Internal BDC table containing the screen information needed to

execute the required transaction and then passing this to the Call transaction command (See code example).

The full procedure for creating a BDC program is as follows:

What is the difference between batch input and call transaction in BDC?

Session method.

1) synchronous processing.

2) can tranfer large amount of data.

3) processing is slower.

4) error log is created

5) data is not updated until session is processed.

Call transaction.

1) asynchronous processing

2) can transfer small amount of data

3) processing is faster.

4) errors need to be handled explicitly

5) data is updated automatically

BATINPUT/DIRECT INPUT

A: Batch-inputs can not be used to fill the "delivery due list" screen because it is not a dynpro. This is a standard SAP report. A SAP report (check with "System -> Status") may be called using SUBMIT sentence with the appropriate options . It is preferred to call a report than create a Batch-input program.

<a href="http://www.guidancetech.com/people/holland/sap/abap/zzsni001.htm">http://www.guidancetech.com/people/holland/sap/abap/zzsni001.htm</a>

Cheers,

Simha

Re: any one please

Former Member — Wed, 28 Feb 2007 08:31:13 GMT

Check

http://www.sap-img.com/bdc.htm

Regards,

Santosh