ABAP Select data from SAP table GTB_S_SELFIELDS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM GTB_S_SELFIELDS
*  INTO TABLE @DATA(IT_GTB_S_SELFIELDS2).
*--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_GTB_S_SELFIELDS INDEX 1 INTO DATA(WA_GTB_S_SELFIELDS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<GTB_S_SELFIELDS>-TABNAME = 1.
<GTB_S_SELFIELDS>-FIELDNAME = 1.
<GTB_S_SELFIELDS>-ENTRY = 1.
<GTB_S_SELFIELDS>-SIGN = 1.
<GTB_S_SELFIELDS>-OPTION = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_GTB_S_SELFIELDS-LOW, sy-vline,
  WA_GTB_S_SELFIELDS-HIGH, sy-vline,
  WA_GTB_S_SELFIELDS-TYPE, sy-vline,
  WA_GTB_S_SELFIELDS-OUTPUTLEN, sy-vline,
  WA_GTB_S_SELFIELDS-INTLEN, sy-vline,
  WA_GTB_S_SELFIELDS-CONVEXIT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_GTB_S_SELFIELDS 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_GTB_S_SELFIELDS 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_GTB_S_SELFIELDS INTO WA_GTB_S_SELFIELDS.


*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 DTYPE, internal->external for field DATATYPE
CALL FUNCTION 'CONVERSION_EXIT_DTYPE_OUTPUT'
  EXPORTING
    input =                      WA_GTB_S_SELFIELDS-DATATYPE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_GTB_S_SELFIELDS-DATATYPE.
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_GTB_S_SELFIELDS_STR, 
TABNAME TYPE STRING,
FIELDNAME TYPE STRING,
ENTRY TYPE STRING,
SIGN TYPE STRING,
OPTION TYPE STRING,
LOW TYPE STRING,
HIGH TYPE STRING,
TYPE TYPE STRING,
OUTPUTLEN TYPE STRING,
INTLEN TYPE STRING,
CONVEXIT TYPE STRING,
SCRTEXT_M TYPE STRING,
SCRTEXT_L TYPE STRING,
DATATYPE TYPE STRING,
MARK TYPE STRING,
KEY TYPE STRING,
PUSH TYPE STRING,
INPUT TYPE STRING,
CLIENT TYPE STRING,
ROLLNAME TYPE STRING,
LOWERCASE TYPE STRING,
LOW_NOCONV TYPE STRING,
HIGH_NOCONV TYPE STRING,
CURR_ADD_UP TYPE STRING,
QUAN_ADD_UP TYPE STRING,
CURR_ADD_UP_REF TYPE STRING,
QUAN_ADD_UP_REF TYPE STRING,
GROUP_BY TYPE STRING,
SUM_UP TYPE STRING,
ORDER_BY TYPE STRING,
SETID TYPE STRING,
AGGREGATE TYPE STRING,
TOPLOW TYPE STRING,
SORTORDER TYPE STRING,
SORTUSED TYPE STRING,
REFTABLE TYPE STRING,
REFFIELD TYPE STRING,END OF T_EKKO_STR.
DATA: WA_GTB_S_SELFIELDS_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_GTB_S_SELFIELDS_STR-TABNAME sy-vline 
WA_GTB_S_SELFIELDS_STR-FIELDNAME sy-vline 
WA_GTB_S_SELFIELDS_STR-ENTRY sy-vline 
WA_GTB_S_SELFIELDS_STR-SIGN sy-vline 
WA_GTB_S_SELFIELDS_STR-OPTION sy-vline 
WA_GTB_S_SELFIELDS_STR-LOW sy-vline 
WA_GTB_S_SELFIELDS_STR-HIGH sy-vline 
WA_GTB_S_SELFIELDS_STR-TYPE sy-vline 
WA_GTB_S_SELFIELDS_STR-OUTPUTLEN sy-vline 
WA_GTB_S_SELFIELDS_STR-INTLEN sy-vline 
WA_GTB_S_SELFIELDS_STR-CONVEXIT sy-vline 
WA_GTB_S_SELFIELDS_STR-SCRTEXT_M sy-vline 
WA_GTB_S_SELFIELDS_STR-SCRTEXT_L sy-vline 
WA_GTB_S_SELFIELDS_STR-DATATYPE sy-vline 
WA_GTB_S_SELFIELDS_STR-MARK sy-vline 
WA_GTB_S_SELFIELDS_STR-KEY sy-vline 
WA_GTB_S_SELFIELDS_STR-PUSH sy-vline 
WA_GTB_S_SELFIELDS_STR-INPUT sy-vline 
WA_GTB_S_SELFIELDS_STR-CLIENT sy-vline 
WA_GTB_S_SELFIELDS_STR-ROLLNAME sy-vline 
WA_GTB_S_SELFIELDS_STR-LOWERCASE sy-vline 
WA_GTB_S_SELFIELDS_STR-LOW_NOCONV sy-vline 
WA_GTB_S_SELFIELDS_STR-HIGH_NOCONV sy-vline 
WA_GTB_S_SELFIELDS_STR-CURR_ADD_UP sy-vline 
WA_GTB_S_SELFIELDS_STR-QUAN_ADD_UP sy-vline 
WA_GTB_S_SELFIELDS_STR-CURR_ADD_UP_REF sy-vline 
WA_GTB_S_SELFIELDS_STR-QUAN_ADD_UP_REF sy-vline 
WA_GTB_S_SELFIELDS_STR-GROUP_BY sy-vline 
WA_GTB_S_SELFIELDS_STR-SUM_UP sy-vline 
WA_GTB_S_SELFIELDS_STR-ORDER_BY sy-vline 
WA_GTB_S_SELFIELDS_STR-SETID sy-vline 
WA_GTB_S_SELFIELDS_STR-AGGREGATE sy-vline 
WA_GTB_S_SELFIELDS_STR-TOPLOW sy-vline 
WA_GTB_S_SELFIELDS_STR-SORTORDER sy-vline 
WA_GTB_S_SELFIELDS_STR-SORTUSED sy-vline 
WA_GTB_S_SELFIELDS_STR-REFTABLE sy-vline 
WA_GTB_S_SELFIELDS_STR-REFFIELD sy-vline      INTO ld_text SEPARATED BY SPACE.

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