ABAP Select data from SAP table /BKC/S21_T528B into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP /BKC/S21_T528B 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 /BKC/S21_T528B. See here for more generic Select statement tips.

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.

There is also a full declaration of the /BKC/S21_T528B 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.

DATA: IT_/BKC/S21_T528B TYPE STANDARD TABLE OF /BKC/S21_T528B,
      WA_/BKC/S21_T528B TYPE /BKC/S21_T528B,
      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: </BKC/S21_T528B> TYPE /BKC/S21_T528B.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_/BKC/S21_T528B.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM /BKC/S21_T528B
  INTO TABLE IT_/BKC/S21_T528B.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /BKC/S21_T528B
*  INTO TABLE @DATA(IT_/BKC/S21_T528B2).
*--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_/BKC/S21_T528B INDEX 1 INTO DATA(WA_/BKC/S21_T528B2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_/BKC/S21_T528B ASSIGNING </BKC/S21_T528B>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
</BKC/S21_T528B>-MANDT = 1.
</BKC/S21_T528B>-OTYPE = 1.
</BKC/S21_T528B>-PLANS = 1.
</BKC/S21_T528B>-ENDDA = 1.
</BKC/S21_T528B>-BEGDA = 1.

ENDLOOP.

LOOP AT IT_/BKC/S21_T528B INTO WA_/BKC/S21_T528B.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/BKC/S21_T528B-MOLGA, sy-vline,
  WA_/BKC/S21_T528B-TRFAR, sy-vline,
  WA_/BKC/S21_T528B-TRFGB, sy-vline,
  WA_/BKC/S21_T528B-TRFKZ, sy-vline,
  WA_/BKC/S21_T528B-TRFGR, sy-vline,
  WA_/BKC/S21_T528B-TRFST, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/BKC/S21_T528B 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_/BKC/S21_T528B 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_/BKC/S21_T528B INTO WA_/BKC/S21_T528B.


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

*Convert 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_/BKC/S21_T528B_STR, 
MANDT TYPE STRING,
OTYPE TYPE STRING,
PLANS TYPE STRING,
ENDDA TYPE STRING,
BEGDA TYPE STRING,
MOLGA TYPE STRING,
TRFAR TYPE STRING,
TRFGB TYPE STRING,
TRFKZ TYPE STRING,
TRFGR TYPE STRING,
TRFST TYPE STRING,
ARBWS TYPE STRING,
AWTGR TYPE STRING,
GESCH TYPE STRING,
STELL TYPE STRING,
SCHWA TYPE STRING,
MAINT TYPE STRING,
ORGEH TYPE STRING,
PERNR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/BKC/S21_T528B_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_/BKC/S21_T528B_STR-MANDT sy-vline 
WA_/BKC/S21_T528B_STR-OTYPE sy-vline 
WA_/BKC/S21_T528B_STR-PLANS sy-vline 
WA_/BKC/S21_T528B_STR-ENDDA sy-vline 
WA_/BKC/S21_T528B_STR-BEGDA sy-vline 
WA_/BKC/S21_T528B_STR-MOLGA sy-vline 
WA_/BKC/S21_T528B_STR-TRFAR sy-vline 
WA_/BKC/S21_T528B_STR-TRFGB sy-vline 
WA_/BKC/S21_T528B_STR-TRFKZ sy-vline 
WA_/BKC/S21_T528B_STR-TRFGR sy-vline 
WA_/BKC/S21_T528B_STR-TRFST sy-vline 
WA_/BKC/S21_T528B_STR-ARBWS sy-vline 
WA_/BKC/S21_T528B_STR-AWTGR sy-vline 
WA_/BKC/S21_T528B_STR-GESCH sy-vline 
WA_/BKC/S21_T528B_STR-STELL sy-vline 
WA_/BKC/S21_T528B_STR-SCHWA sy-vline 
WA_/BKC/S21_T528B_STR-MAINT sy-vline 
WA_/BKC/S21_T528B_STR-ORGEH sy-vline 
WA_/BKC/S21_T528B_STR-PERNR sy-vline      INTO ld_text SEPARATED BY SPACE.

*Add any further fields from structure WA_EKKO_STR you want to CONCATENATE...
ENDLOOP.
ENDFORM.