ABAP Select data from SAP table T539S into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP T539S 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 T539S. 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 T539S 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_T539S TYPE STANDARD TABLE OF T539S,
      WA_T539S TYPE T539S,
      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: <T539S> TYPE T539S.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_T539S.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM T539S
  INTO TABLE IT_T539S.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM T539S
*  INTO TABLE @DATA(IT_T539S2).
*--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_T539S INDEX 1 INTO DATA(WA_T539S2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_T539S ASSIGNING <T539S>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<T539S>-MANDT = 1.
<T539S>-MOLGA = 1.
<T539S>-VDISI = 1.
<T539S>-LGABZ = 1.
<T539S>-LGANR = 1.

ENDLOOP.

LOOP AT IT_T539S INTO WA_T539S.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_T539S-ENDDA, sy-vline,
  WA_T539S-BEGDA, sy-vline,
  WA_T539S-SEQNR, sy-vline,
  WA_T539S-KZJNX, sy-vline,
  WA_T539S-LGNBZ, sy-vline,
  WA_T539S-LGAWS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_T539S 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_T539S 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_T539S INTO WA_T539S.


*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_T539S_STR, 
MANDT TYPE STRING,
MOLGA TYPE STRING,
VDISI TYPE STRING,
LGABZ TYPE STRING,
LGANR TYPE STRING,
ENDDA TYPE STRING,
BEGDA TYPE STRING,
SEQNR TYPE STRING,
KZJNX TYPE STRING,
LGNBZ TYPE STRING,
LGAWS TYPE STRING,
RKBET TYPE STRING,
RKART TYPE STRING,
RKAMT TYPE STRING,
RKWAE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_T539S_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_T539S_STR-MANDT sy-vline 
WA_T539S_STR-MOLGA sy-vline 
WA_T539S_STR-VDISI sy-vline 
WA_T539S_STR-LGABZ sy-vline 
WA_T539S_STR-LGANR sy-vline 
WA_T539S_STR-ENDDA sy-vline 
WA_T539S_STR-BEGDA sy-vline 
WA_T539S_STR-SEQNR sy-vline 
WA_T539S_STR-KZJNX sy-vline 
WA_T539S_STR-LGNBZ sy-vline 
WA_T539S_STR-LGAWS sy-vline 
WA_T539S_STR-RKBET sy-vline 
WA_T539S_STR-RKART sy-vline 
WA_T539S_STR-RKAMT sy-vline 
WA_T539S_STR-RKWAE sy-vline      INTO ld_text SEPARATED BY SPACE.

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