ABAP Select data from SAP table T539R into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP T539R 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 T539R. 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 T539R 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_T539R TYPE STANDARD TABLE OF T539R,
      WA_T539R TYPE T539R,
      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: <T539R> TYPE T539R.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_T539R.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM T539R
  INTO TABLE IT_T539R.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM T539R
*  INTO TABLE @DATA(IT_T539R2).
*--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_T539R INDEX 1 INTO DATA(WA_T539R2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_T539R ASSIGNING <T539R>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<T539R>-MANDT = 1.
<T539R>-MOLGA = 1.
<T539R>-VDISI = 1.
<T539R>-ENDDA = 1.
<T539R>-BEGDA = 1.

ENDLOOP.

LOOP AT IT_T539R INTO WA_T539R.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_T539R-VGKLS, sy-vline,
  WA_T539R-RKEIN, sy-vline,
  WA_T539R-RKINT, sy-vline,
  WA_T539R-FSKLS, sy-vline,
  WA_T539R-VDTYP, sy-vline,
  WA_T539R-LGABZ, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_T539R 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_T539R 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_T539R INTO WA_T539R.


*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_T539R_STR, 
MANDT TYPE STRING,
MOLGA TYPE STRING,
VDISI TYPE STRING,
ENDDA TYPE STRING,
BEGDA TYPE STRING,
VGKLS TYPE STRING,
RKEIN TYPE STRING,
RKINT TYPE STRING,
FSKLS TYPE STRING,
VDTYP TYPE STRING,
LGABZ TYPE STRING,
LGNBZ TYPE STRING,
LGAWS TYPE STRING,
VOPER TYPE STRING,
WKTYZ TYPE STRING,
ABTYZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_T539R_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_T539R_STR-MANDT sy-vline 
WA_T539R_STR-MOLGA sy-vline 
WA_T539R_STR-VDISI sy-vline 
WA_T539R_STR-ENDDA sy-vline 
WA_T539R_STR-BEGDA sy-vline 
WA_T539R_STR-VGKLS sy-vline 
WA_T539R_STR-RKEIN sy-vline 
WA_T539R_STR-RKINT sy-vline 
WA_T539R_STR-FSKLS sy-vline 
WA_T539R_STR-VDTYP sy-vline 
WA_T539R_STR-LGABZ sy-vline 
WA_T539R_STR-LGNBZ sy-vline 
WA_T539R_STR-LGAWS sy-vline 
WA_T539R_STR-VOPER sy-vline 
WA_T539R_STR-WKTYZ sy-vline 
WA_T539R_STR-ABTYZ sy-vline      INTO ld_text SEPARATED BY SPACE.

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