ABAP Select data from SAP table SEL_ARG into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM SEL_ARG
*  INTO TABLE @DATA(IT_SEL_ARG2).
*--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_SEL_ARG INDEX 1 INTO DATA(WA_SEL_ARG2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<SEL_ARG>-VIEW = 1.
<SEL_ARG>-IS_VIEWCLUSTER = 1.
<SEL_ARG>-ACTION = 1.
<SEL_ARG>-LISTDETAIL = 1.
<SEL_ARG>-BWVAR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_SEL_ARG-KALKA, sy-vline,
  WA_SEL_ARG-TERID, sy-vline,
  WA_SEL_ARG-AUFKZ, sy-vline,
  WA_SEL_ARG-UEBID, sy-vline,
  WA_SEL_ARG-REFID, sy-vline,
  WA_SEL_ARG-SICHT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_SEL_ARG 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_SEL_ARG 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_SEL_ARG INTO WA_SEL_ARG.


*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_SEL_ARG_STR, 
VIEW TYPE STRING,
IS_VIEWCLUSTER TYPE STRING,
ACTION TYPE STRING,
LISTDETAIL TYPE STRING,
BWVAR TYPE STRING,
KALKA TYPE STRING,
TERID TYPE STRING,
AUFKZ TYPE STRING,
UEBID TYPE STRING,
REFID TYPE STRING,
SICHT TYPE STRING,
ELEHK TYPE STRING,
KALSM TYPE STRING,
PART_VRSN TYPE STRING,
OK_CODE TYPE STRING,
APLID TYPE STRING,
CAPID TYPE STRING,
SEL_ID TYPE STRING,
KLVAR TYPE STRING,
BUKRS TYPE STRING,
KOKRS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_SEL_ARG_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_SEL_ARG_STR-VIEW sy-vline 
WA_SEL_ARG_STR-IS_VIEWCLUSTER sy-vline 
WA_SEL_ARG_STR-ACTION sy-vline 
WA_SEL_ARG_STR-LISTDETAIL sy-vline 
WA_SEL_ARG_STR-BWVAR sy-vline 
WA_SEL_ARG_STR-KALKA sy-vline 
WA_SEL_ARG_STR-TERID sy-vline 
WA_SEL_ARG_STR-AUFKZ sy-vline 
WA_SEL_ARG_STR-UEBID sy-vline 
WA_SEL_ARG_STR-REFID sy-vline 
WA_SEL_ARG_STR-SICHT sy-vline 
WA_SEL_ARG_STR-ELEHK sy-vline 
WA_SEL_ARG_STR-KALSM sy-vline 
WA_SEL_ARG_STR-PART_VRSN sy-vline 
WA_SEL_ARG_STR-OK_CODE sy-vline 
WA_SEL_ARG_STR-APLID sy-vline 
WA_SEL_ARG_STR-CAPID sy-vline 
WA_SEL_ARG_STR-SEL_ID sy-vline 
WA_SEL_ARG_STR-KLVAR sy-vline 
WA_SEL_ARG_STR-BUKRS sy-vline 
WA_SEL_ARG_STR-KOKRS sy-vline      INTO ld_text SEPARATED BY SPACE.

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