ABAP handler overview
An ABAP handler is a function module that gets data into and out of the SAP application database. For each business object definition that you develop, you must support it by developing a custom ABAP handler.
ABAP handlers are in the SAP application as ABAP function modules. ABAP handlers are responsible for adding business-object data into the SAP application database (for Create, Update, and Delete operations) or for using the business-object data as the keys to retrieving data from the SAP application database (for the Retrieve operation).
You must develop operation-specific ABAP handlers for each hierarchical business object that must be supported. If you change the business object definition, you must also change the ABAP handler.
- Call Transaction
Call Transaction is the SAP-provided mechanism for entering data into an SAP system. Call Transaction guarantees that the data adheres to the SAP data model by using the same screens an online user sees in a transaction. This process is commonly referred to as screen scraping.
- Batch data communication (BDC)
Batch Data Communication (BDC) is an instruction set that SAP can follow to process a transaction without user intervention. The instructions specify the sequence in which the screens in a transaction are processed and which fields are populated with data on which screens. All of the elements of an SAP transaction that are exposed to an online user have identifications that can be used in a BDC.
- ABAP SQL
ABAP SQL is the SAP proprietary version of SQL. It is database-independent and platform-independent, so that whatever SQL code you write, you can run it on any database and platform combination that SAP supports. ABAP SQL is similar in syntax to other versions of SQL and supports all of the basic database table commands such as update, insert, modify, select, and delete. For a complete description of ABAP SQL, see your SAP documentation.
By using ABAP SQL, an ABAP handler can modify SAP database tables with business-object data for create, update, and delete operations. It can also use the business-object data in the where clause of an ABAP select statement as the keys.
Do not use ABAP SQL to modify SAP tables, because it might corrupt the integrity of the database. Use ABAP SQL only to retrieve data.
- ABAP Function Modules and Subroutines
From the ABAP handler, you can call ABAP function modules or subroutines that implement the required function.
- The adapter includes the Call Transaction Recorder wizard to assist you in developing the ABAP handlers that use call transactions or BDC sessions.
- The Adapter Connection wizard generates the required business objects and other resources for Advanced event processing. The business objects are based on IDocs, which can be custom or standard.
- The adapter provides samples that you can refer to for an understanding of the Advanced event processing implementation.