ABAP Select data from SAP table WAFS_S_CLASS into internal table



Get Example source ABAP code based on a different SAP table
  

So we all know S/4Hana is the latest version and the future of SAP but what about the selecting data from hana tables like WAFS_S_CLASS is it the same and what the table looks like in an S/4 system. If you havent seen or logged into an S/4Hana system you might be surprised at how similar it looks to the previous ERP/ECC version. Infact when using the gui it is difficult to tell the difference, and selecting data from database tables the same is true. Infact even for tables that have been replaced in hana, SAP have purposfully created versions of the old/original tables for backward compatability. This means your existing ABAP code will still work while you implement changes that take advantage of the new functionality and Hana in-memory tables.

You can see what table WAFS_S_CLASS looks like in an S/4 system here and below is a number of ABAP code snippets to demonstrate how to select data from SAP WAFS_S_CLASS table and store it within an internal table, including using the newer @DATA inline declaration methods. It also shows you various ways to process this data using ABAP work area, inline declaration or field symbols including executing all the relevant CONVERSION_EXIT routines specific to WAFS_S_CLASS. See here for more generic Select statement tips.

DATA: IT_WAFS_S_CLASS TYPE STANDARD TABLE OF WAFS_S_CLASS,
      WA_WAFS_S_CLASS TYPE WAFS_S_CLASS,
      GD_STR TYPE STRING.

DATA: lo_typedescr type REF TO cl_abap_typedescr.
DATA: lv_fieldname type fieldname.

FIELD-SYMBOLS: <FIELD> TYPE any.
FIELD-SYMBOLS: <WAFS_S_CLASS> TYPE WAFS_S_CLASS.

*Process all fields in table header/work area as string values, full declaration of the WAFS_S_CLASS 
*table where each field has a char/string type for you to simply copy and paste. This allows 
*you to use processing that is only available to these field types such as the CONCATENATE statement.
  PERFORM process_as_string_field_values CHANGING wa_WAFS_S_CLASS.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM WAFS_S_CLASS
  INTO TABLE IT_WAFS_S_CLASS.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WAFS_S_CLASS
*  INTO TABLE @DATA(IT_WAFS_S_CLASS2).
*--Further methods of using ABAP code to  select data from SAP database tables

*You can also declare the header/work area using the in-line DATA declaration method
READ TABLE IT_WAFS_S_CLASS INDEX 1 INTO DATA(WA_WAFS_S_CLASS2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_WAFS_S_CLASS ASSIGNING <WAFS_S_CLASS>.
*To update a field value using a field symbol simply change the value via the field symbol pointer
<WAFS_S_CLASS>-CLINT = 1.
<WAFS_S_CLASS>-CLASS = 1.
ENDLOOP.

LOOP AT IT_WAFS_S_CLASS INTO WA_WAFS_S_CLASS.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline, ENDLOOP.
   
*Add any further fields from structure WA_WAFS_S_CLASS you want to display...

  WRITE:/ sy-uline.
* Aternatively use generic code to Write field values (and NAME) to screen report
  DO.
    ASSIGN COMPONENT sy-index OF STRUCTURE wa_WAFS_S_CLASS TO <field>.
    IF sy-subrc <> 0. EXIT. ENDIF.
    WRITE:/ 'Field Value', <field>, sy-vline.
    gd_str = <field> .
    lo_typedescr ?= CL_ABAP_DATADESCR=>DESCRIBE_BY_DATA( <field> ).
    lv_fieldname = lo_typedescr->GET_RELATIVE_NAME( ).
    WRITE:/ 'Field Name', lv_fieldname.
  ENDDO.

  
*Redo loop but convert all fields from internal to out value  
LOOP AT IT_WAFS_S_CLASS INTO WA_WAFS_S_CLASS.


*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Sometimes data within SAP is stored within the database table in a different format to 
*what it is displayed to the user. These input/output conversation FM routines are what 
*translates the data between the two formats. This form converts all fields to display/output 
*versions using conversion routines
  PERFORM convert_all_field_values CHANGING wa_EKKO.
	 
ENDLOOP.

  
*&---------------------------------------------------------------------*
*& Form convert_all_field_values
*&---------------------------------------------------------------------*
FORM convert_all_field_values CHANGING p_EKKO LIKE wa_EKKO.
DATA: ld_input(1000) TYPE c, ld_output(1000) TYPE C.
ENDFORM. *&---------------------------------------------------------------------* *& Form process_as_string_field_values *&---------------------------------------------------------------------* FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO. TYPES: BEGIN OF T_WAFS_S_CLASS_STR,
CLINT TYPE STRING,
CLASS TYPE STRING,END OF T_EKKO_STR. DATA: WA_WAFS_S_CLASS_STR type T_EKKO_STR. DATA: ld_text TYPE string. LOOP AT IT_EKKO INTO WA_EKKO. MOVE-CORRESPONDING wa_EKKO TO WA_EKKO_STR. CONCATENATE: sy-vline
WA_WAFS_S_CLASS_STR-CLINT sy-vline
WA_WAFS_S_CLASS_STR-CLASS sy-vline INTO ld_text SEPARATED BY SPACE. *Add any further fields from structure WA_EKKO_STR you want to CONCATENATE... ENDLOOP. ENDFORM.