Diffrence between RFC & BAPI

Question

hi good morning all ,
please tell me the exact diffrence between RFC & BAPI  .
thanks in advance .
regards ,
srinivas

Answer 1

Hi,
1)BAPI are RFC enabled function modules. the difference between RFc and BAPI
are business objects. You create business objects and those are then
registered in your BOR (Business Object Repository) which can be accessed
outside the SAP system by using some other applications (Non-SAP) such as VB
or JAVA. in this case u only specify the business object and its method from
external system in BAPI there is no direct system call. while RFC are direct
system call Some BAPIs provide basic functions and can be used for most SAP
business object types. These BAPIs should be implemented the same for all
business object types. Standardized BAPIs are easier to use and prevent
users having to deal with a number of different BAPIs. Whenever possible, a
standardized BAPI must be used in preference to an individual BAPI.
The following standardized BAPIs are provided:
Reading instances of SAP business objects
GetList ( ) With the BAPI GetList you can select a range of object key
values, for example, company codes and material numbers.
The BAPI GetList() is a class method.
GetDetail() With the BAPI GetDetail() the details of an instance of a
business object type are retrieved and returned to the calling program. The
instance is identified via its key. The BAPI GetDetail() is an instance
method. BAPIs that can create, change or delete instances of a business
object type
The following BAPIs of the same object type have to be programmed so that
they can be called several times within one transaction. For example, if,
after sales order 1 has been created, a second sales order 2 is created in
the same transaction, the second BAPI call must not affect the consistency
of the sales order 2. After completing the transaction with a COMMIT WORK,
both the orders are saved consistently in the database.
Create( ) and CreateFromData! ( )
The BAPIs Create() and CreateFromData() create an instance of an SAP
business object type, for example, a purchase order. These BAPIs are class
methods.
Change( )
The BAPI Change() changes an existing instance of an SAP business object
type, for example, a purchase order. The BAPI Change () is an instance
method.
Delete( ) and Undelete( ) The BAPI Delete() deletes an instance of an SAP
business object type from the database or sets a deletion flag.
The BAPI Undelete() removes a deletion flag. These BAPIs are instance
methods.
Cancel ( ) Unlike the BAPI Delete(), the BAPI Cancel() cancels an instance
of a business object type. The instance to be cancelled remains in the
database and an additional instance is created and this is the one that is
actually canceled. The Cancel() BAPI is an instance method.
Add ( ) and Remove ( ) The BAPI Add adds a
subobject to an existing object inst! ance and the BAPI and
Remove removes a subobject from an object instance. These BAPIs
are instance methods.
2) No it is not possible to connect SAP to Non-SAP systems to retrieve data
using RFC alone. RFC can acces the SAP from outside only through BAPI and
same is for vice versa access.
3) Each Bapi Object has Interface, Key Fields, Attributes,Methods and
Events.
Bapi Function Modules can be attached to these Bapi objects .Function module
has a single bound functionality while a BAPI object can contain many
functionalities
Rgds
Yogesh