ABAP Select data from SAP table T439A into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP T439A 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 T439A. 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 T439A 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_T439A TYPE STANDARD TABLE OF T439A,
      WA_T439A TYPE T439A,
      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: <T439A> TYPE T439A.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_T439A.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM T439A
  INTO TABLE IT_T439A.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM T439A
*  INTO TABLE @DATA(IT_T439A2).
*--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_T439A INDEX 1 INTO DATA(WA_T439A2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_T439A ASSIGNING <T439A>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<T439A>-MANDT = 1.
<T439A>-DISLS = 1.
<T439A>-LOSVF = 1.
<T439A>-LOSKZ = 1.
<T439A>-PERAZ = 1.

ENDLOOP.

LOOP AT IT_T439A INTO WA_T439A.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_T439A-TERBV, sy-vline,
  WA_T439A-UELAP, sy-vline,
  WA_T439A-KFPKZ, sy-vline,
  WA_T439A-KFPAZ, sy-vline,
  WA_T439A-LGLVF, sy-vline,
  WA_T439A-LGLKZ, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_T439A 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_T439A 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_T439A INTO WA_T439A.


*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_T439A_STR, 
MANDT TYPE STRING,
DISLS TYPE STRING,
LOSVF TYPE STRING,
LOSKZ TYPE STRING,
PERAZ TYPE STRING,
TERBV TYPE STRING,
UELAP TYPE STRING,
KFPKZ TYPE STRING,
KFPAZ TYPE STRING,
LGLVF TYPE STRING,
LGLKZ TYPE STRING,
LGPAZ TYPE STRING,
LGTER TYPE STRING,
LGUEL TYPE STRING,
LGMIN TYPE STRING,
LGMAX TYPE STRING,
KZSPL TYPE STRING,
LGSPL TYPE STRING,
INTKA TYPE STRING,
LGINT TYPE STRING,
LGKND TYPE STRING,
KZHOR TYPE STRING,
HBVAR TYPE STRING,
LASTL TYPE STRING,
UNTKZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_T439A_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_T439A_STR-MANDT sy-vline 
WA_T439A_STR-DISLS sy-vline 
WA_T439A_STR-LOSVF sy-vline 
WA_T439A_STR-LOSKZ sy-vline 
WA_T439A_STR-PERAZ sy-vline 
WA_T439A_STR-TERBV sy-vline 
WA_T439A_STR-UELAP sy-vline 
WA_T439A_STR-KFPKZ sy-vline 
WA_T439A_STR-KFPAZ sy-vline 
WA_T439A_STR-LGLVF sy-vline 
WA_T439A_STR-LGLKZ sy-vline 
WA_T439A_STR-LGPAZ sy-vline 
WA_T439A_STR-LGTER sy-vline 
WA_T439A_STR-LGUEL sy-vline 
WA_T439A_STR-LGMIN sy-vline 
WA_T439A_STR-LGMAX sy-vline 
WA_T439A_STR-KZSPL sy-vline 
WA_T439A_STR-LGSPL sy-vline 
WA_T439A_STR-INTKA sy-vline 
WA_T439A_STR-LGINT sy-vline 
WA_T439A_STR-LGKND sy-vline 
WA_T439A_STR-KZHOR sy-vline 
WA_T439A_STR-HBVAR sy-vline 
WA_T439A_STR-LASTL sy-vline 
WA_T439A_STR-UNTKZ sy-vline      INTO ld_text SEPARATED BY SPACE.

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