ABAP Select data from SAP table DFKKOP_LISTH into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DFKKOP_LISTH
*  INTO TABLE @DATA(IT_DFKKOP_LISTH2).
*--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_DFKKOP_LISTH INDEX 1 INTO DATA(WA_DFKKOP_LISTH2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DFKKOP_LISTH>-MANDT = 1.
<DFKKOP_LISTH>-GUID = 1.
<DFKKOP_LISTH>-KEYDATE = 1.
<DFKKOP_LISTH>-TXT50 = 1.
<DFKKOP_LISTH>-AKTYP = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DFKKOP_LISTH-LAUFD, sy-vline,
  WA_DFKKOP_LISTH-LAUFI, sy-vline,
  WA_DFKKOP_LISTH-ERNAM, sy-vline,
  WA_DFKKOP_LISTH-ERDAT, sy-vline,
  WA_DFKKOP_LISTH-ERTIM, sy-vline,
  WA_DFKKOP_LISTH-TIMESTAMP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DFKKOP_LISTH 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_DFKKOP_LISTH 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_DFKKOP_LISTH INTO WA_DFKKOP_LISTH.


*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_DFKKOP_LISTH_STR, 
MANDT TYPE STRING,
GUID TYPE STRING,
KEYDATE TYPE STRING,
TXT50 TYPE STRING,
AKTYP TYPE STRING,
LAUFD TYPE STRING,
LAUFI TYPE STRING,
ERNAM TYPE STRING,
ERDAT TYPE STRING,
ERTIM TYPE STRING,
TIMESTAMP TYPE STRING,
TCODE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DFKKOP_LISTH_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_DFKKOP_LISTH_STR-MANDT sy-vline 
WA_DFKKOP_LISTH_STR-GUID sy-vline 
WA_DFKKOP_LISTH_STR-KEYDATE sy-vline 
WA_DFKKOP_LISTH_STR-TXT50 sy-vline 
WA_DFKKOP_LISTH_STR-AKTYP sy-vline 
WA_DFKKOP_LISTH_STR-LAUFD sy-vline 
WA_DFKKOP_LISTH_STR-LAUFI sy-vline 
WA_DFKKOP_LISTH_STR-ERNAM sy-vline 
WA_DFKKOP_LISTH_STR-ERDAT sy-vline 
WA_DFKKOP_LISTH_STR-ERTIM sy-vline 
WA_DFKKOP_LISTH_STR-TIMESTAMP sy-vline 
WA_DFKKOP_LISTH_STR-TCODE sy-vline      INTO ld_text SEPARATED BY SPACE.

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