ABAP Select data from SAP table WTAD_CHANGE_MAIN into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WTAD_CHANGE_MAIN
*  INTO TABLE @DATA(IT_WTAD_CHANGE_MAIN2).
*--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_WTAD_CHANGE_MAIN INDEX 1 INTO DATA(WA_WTAD_CHANGE_MAIN2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WTAD_CHANGE_MAIN>-MATNR = 1.
<WTAD_CHANGE_MAIN>-MAKTX = 1.
<WTAD_CHANGE_MAIN>-MATKL = 1.
<WTAD_CHANGE_MAIN>-MEINS = 1.
<WTAD_CHANGE_MAIN>-NUMTP = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WTAD_CHANGE_MAIN-EAN11, sy-vline,
  WA_WTAD_CHANGE_MAIN-INHME, sy-vline,
  WA_WTAD_CHANGE_MAIN-INHAL, sy-vline,
  WA_WTAD_CHANGE_MAIN-VPREH, sy-vline,
  WA_WTAD_CHANGE_MAIN-INHBR, sy-vline,
  WA_WTAD_CHANGE_MAIN-ATNAM, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WTAD_CHANGE_MAIN 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_WTAD_CHANGE_MAIN 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_WTAD_CHANGE_MAIN INTO WA_WTAD_CHANGE_MAIN.


*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.

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_WTAD_CHANGE_MAIN-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WTAD_CHANGE_MAIN-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_WTAD_CHANGE_MAIN-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WTAD_CHANGE_MAIN-MEINS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit EAN11, internal->external for field EAN11
CALL FUNCTION 'CONVERSION_EXIT_EAN11_OUTPUT'
  EXPORTING
    input =                      WA_WTAD_CHANGE_MAIN-EAN11
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WTAD_CHANGE_MAIN-EAN11.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field INHME
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_WTAD_CHANGE_MAIN-INHME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WTAD_CHANGE_MAIN-INHME.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MELAY
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_WTAD_CHANGE_MAIN-MELAY
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WTAD_CHANGE_MAIN-MELAY.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field SAISJ
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_WTAD_CHANGE_MAIN-SAISJ
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WTAD_CHANGE_MAIN-SAISJ.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field AKTNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WTAD_CHANGE_MAIN-AKTNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WTAD_CHANGE_MAIN-AKTNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field ADDIMAT
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_WTAD_CHANGE_MAIN-ADDIMAT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WTAD_CHANGE_MAIN-ADDIMAT.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_WTAD_CHANGE_MAIN_STR, 
MATNR TYPE STRING,
MAKTX TYPE STRING,
MATKL TYPE STRING,
MEINS TYPE STRING,
NUMTP TYPE STRING,
EAN11 TYPE STRING,
INHME TYPE STRING,
INHAL TYPE STRING,
VPREH TYPE STRING,
INHBR TYPE STRING,
ATNAM TYPE STRING,
ATBEZ TYPE STRING,
ATWRT TYPE STRING,
ATWTB TYPE STRING,
LAYGR TYPE STRING,
LAYVAR TYPE STRING,
HPLGR TYPE STRING,
MELAY TYPE STRING,
SAISO TYPE STRING,
SAISJ TYPE STRING,
AKTNR TYPE STRING,
AVKVO TYPE STRING,
AVKBI TYPE STRING,
ALIVO TYPE STRING,
ALIBI TYPE STRING,
KSCHL TYPE STRING,
DATAN TYPE STRING,
DATAB TYPE STRING,
DATBI TYPE STRING,
KBETR TYPE STRING,
CURCY TYPE STRING,
KPEIN TYPE STRING,
ADDIMAT TYPE STRING,
MAKTM TYPE STRING,
ADDIFM TYPE STRING,
ADDIINVOC TYPE STRING,
ADDIMAKTM TYPE STRING,
ADDIPRASS TYPE STRING,
ADDICALC TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WTAD_CHANGE_MAIN_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_WTAD_CHANGE_MAIN_STR-MATNR sy-vline 
WA_WTAD_CHANGE_MAIN_STR-MAKTX sy-vline 
WA_WTAD_CHANGE_MAIN_STR-MATKL sy-vline 
WA_WTAD_CHANGE_MAIN_STR-MEINS sy-vline 
WA_WTAD_CHANGE_MAIN_STR-NUMTP sy-vline 
WA_WTAD_CHANGE_MAIN_STR-EAN11 sy-vline 
WA_WTAD_CHANGE_MAIN_STR-INHME sy-vline 
WA_WTAD_CHANGE_MAIN_STR-INHAL sy-vline 
WA_WTAD_CHANGE_MAIN_STR-VPREH sy-vline 
WA_WTAD_CHANGE_MAIN_STR-INHBR sy-vline 
WA_WTAD_CHANGE_MAIN_STR-ATNAM sy-vline 
WA_WTAD_CHANGE_MAIN_STR-ATBEZ sy-vline 
WA_WTAD_CHANGE_MAIN_STR-ATWRT sy-vline 
WA_WTAD_CHANGE_MAIN_STR-ATWTB sy-vline 
WA_WTAD_CHANGE_MAIN_STR-LAYGR sy-vline 
WA_WTAD_CHANGE_MAIN_STR-LAYVAR sy-vline 
WA_WTAD_CHANGE_MAIN_STR-HPLGR sy-vline 
WA_WTAD_CHANGE_MAIN_STR-MELAY sy-vline 
WA_WTAD_CHANGE_MAIN_STR-SAISO sy-vline 
WA_WTAD_CHANGE_MAIN_STR-SAISJ sy-vline 
WA_WTAD_CHANGE_MAIN_STR-AKTNR sy-vline 
WA_WTAD_CHANGE_MAIN_STR-AVKVO sy-vline 
WA_WTAD_CHANGE_MAIN_STR-AVKBI sy-vline 
WA_WTAD_CHANGE_MAIN_STR-ALIVO sy-vline 
WA_WTAD_CHANGE_MAIN_STR-ALIBI sy-vline 
WA_WTAD_CHANGE_MAIN_STR-KSCHL sy-vline 
WA_WTAD_CHANGE_MAIN_STR-DATAN sy-vline 
WA_WTAD_CHANGE_MAIN_STR-DATAB sy-vline 
WA_WTAD_CHANGE_MAIN_STR-DATBI sy-vline 
WA_WTAD_CHANGE_MAIN_STR-KBETR sy-vline 
WA_WTAD_CHANGE_MAIN_STR-CURCY sy-vline 
WA_WTAD_CHANGE_MAIN_STR-KPEIN sy-vline 
WA_WTAD_CHANGE_MAIN_STR-ADDIMAT sy-vline 
WA_WTAD_CHANGE_MAIN_STR-MAKTM sy-vline 
WA_WTAD_CHANGE_MAIN_STR-ADDIFM sy-vline 
WA_WTAD_CHANGE_MAIN_STR-ADDIINVOC sy-vline 
WA_WTAD_CHANGE_MAIN_STR-ADDIMAKTM sy-vline 
WA_WTAD_CHANGE_MAIN_STR-ADDIPRASS sy-vline 
WA_WTAD_CHANGE_MAIN_STR-ADDICALC sy-vline      INTO ld_text SEPARATED BY SPACE.

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