Using the Persistent Classes for BAPIs, Part 1

This part explains the usage of persistent classes to the SAP (standard) BAPIs. To simplify matters, a single class will be created for the Business Partner Central Data, this class is used to read and change the existing business partners in a SAP System.

The next part Using the Persistent Classes for BAPIs, Part 2 explains how to create inheriting persistent classes based on the Business Partner Central Data.

Overview

ABAP Object Service

The ABAP Object Services provide global services for working with persistent objects within ABAP applications. The Object Services include:

• Persistence Service, used to manage persistent objects in the data repository
• Transaction Service, is based on the classical SAP transaction concept (SAP LUWs) and used to update the data repository
• Query Service, used for searching of persistent objects (like SQL statements).

The Class Builder provides the complete support for creating and maintaining of persistent classes.

The Class Builder generates for each persistent class SET and GET methods for all defined attributes. In addition, the Class Builder generates two further classes (Base and Agent), which are the class-specific part of the Persistence Service. The agent class manages the persistent objects at runtime. The medhods of the agent class can be mostly redefined. Besides of them, the agent class can be extended with new attributes, methodes etc.

More details to the Object Services under ABAP – Object Services

Standard BAPIs

The standard BAPIs (Business Application Programming Interface) allow an access to the defined SAP Business Objects. The SAP Business Objects with their BAPIs perpresent an object-oriented view of the business functions in a SAP System.

More details to the BAPIs under BAPI User Handbook

SAP Business Partner (BP)

The Business Object “Business Partner” can be used for the central management of business partners in a company for different business applications.

BAPIs for the Business Partner

BAPIs are remote-enabled function modules. The function group BUPA_3 contains all essential function modules for the management of the Business Partner:

The function module BAPI_BUPA_CENTRAL_GETDETAIL

This function module is used to read the central attributes (partner master data) of a business partner depending on the business partner category (organization, person or group of organizations or persons).

Importing parameter: partner number and valid date

Exporting parameter: common central data, partner category specific central data (organization, person or group)

The function module BAPI_BUPA_CENTRAL_CHANGE

This function module is used to change the central attributes of a business partner.

Create a persistent class for BP Central Data

Mapping Structure (DDIC)

.

A persistent class must have one or more references to the DDIC structures. These structures can be database tables, views or structures. The components of these structures can be then defined as attributes of the persistent class. For each attribute the Class Builder generates the access methods GET and SET.

• Mapping as database table or view: The Class Builder generates additionally to the GET/SET the SQL statements for the database access
• Mapping as structures:                   The database access methods must be implemented from developers themself

Since we have to use the database model of the Business Partner and its BADIs we must map a structure to the persistent class. The structure includes all central data structures defined in the function module as parameters.

In addition, the two fields are to define: the partner number and partner category.

The new structure for the persistent class

Create the Persistent Class

Create a persistent class in the Class Builder (The persistent class name must begin with <Y/Z>CL!):

After saving the persistent class we have three new classes in the Class Builder:

• YCL_CENTRAL_PARTNER – the persistent class
• YCB_CENTRAL_PARTNER – the base class for the agent class
• YCA_CENTRAL_PARTNER – the agent (actor) class for the YCL_CENTRAL_PARTNER

Mapping the Structure to the Persistent Plass YCL_CENTRAL_PARTNER

Pick the class YCL_CENTRAL_PARTNER in the Class Builder and click the button “Persistentce”:

Enter the structure name for the persistent class:

Define the two fields PARTNER and VALID_FROM of the structure as Business Key:

The remaining fields are to define as Value Attribute:

After saving the mapping structure and activating the persistent class and their agent (actor) class the Class Builder generates the SET/GET methods for all defined attributes.

The Class Builder adapts also the base and agent classes to the mapped structure type.

Redefine the Agent Class Methods

We have to redefine two agent class methods for reading and writing the cetral data from / to the BAPIs.

• Method MAP_LOAD_FROM_DATABASE_KEY loads persistent data by the business key from the data repository (through BAPI)

    

• Method MAP_SAVE_TO_DATABASE saves changes of persistent objects in the data repository (through BAPI)

    

Test Report

*&———————————————————————*

*& Report  YSDN_CENTRAL_PARTNER_TEST

*&

*&———————————————————————*

*&

*&

*&———————————————————————*

REPORT  ysdn_central_partner_test.

TYPES oscon.

DATA:

  lo_partner   TYPE REF TO ycl_central_partner,

  lo_trans_mng TYPE REF TO if_os_transaction_manager,

  lo_trans     TYPE REF TO if_os_transaction.

PARAMETERS partner TYPE bu_partner.

LOAD-OF-PROGRAM.

* set the transaction mode

  cl_os_system=>init_and_set_modes(

      i_external_commit = oscon_false

      i_update_mode     = oscon_dmode_direct

  ).

START-OF-SELECTION.

  IF ( partner IS NOT INITIAL ).

    lo_trans_mng = cl_os_system=>get_transaction_manager( ).

    lo_trans     = lo_trans_mng->create_transaction( ).

    lo_trans->start( ).

    TRY.

        lo_partner = yca_central_partner=>agent->get_persistent(

            i_partner    = partner

            i_valid_from = sy-datlo

        ).

        CASE lo_partner->get_category( ).

          WHEN ‘1’.

            lo_partner->set_firstname( lo_partner->get_firstname( ) && ‘ test’ ).

          WHEN ‘2’.

            lo_partner->set_name1( lo_partner->get_name1( ) && ‘ test’ ).

          WHEN ‘3’.

            lo_partner->set_namegroup1( lo_partner->get_namegroup1( ) && ‘ test’ ).

          WHEN OTHERS.

            WRITE: ‘The partner category is unknown’.

        ENDCASE.

      CATCH cx_os_object_not_found.

        WRITE: ‘The partner number ‘, partner, ‘ is not found’.

        RETURN.

    ENDTRY.

    lo_trans->end( ).

  ENDIF.