ABAP Select data from SAP table COMT_CFG_KB_HEADER_MD into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM COMT_CFG_KB_HEADER_MD
*  INTO TABLE @DATA(IT_COMT_CFG_KB_HEADER_MD2).
*--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_COMT_CFG_KB_HEADER_MD INDEX 1 INTO DATA(WA_COMT_CFG_KB_HEADER_MD2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<COMT_CFG_KB_HEADER_MD>-KB_KEY = 1.
<COMT_CFG_KB_HEADER_MD>-NAME = 1.
<COMT_CFG_KB_HEADER_MD>-LOGSYS = 1.
<COMT_CFG_KB_HEADER_MD>-VERSION = 1.
<COMT_CFG_KB_HEADER_MD>-KB_HIERARCHY = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_COMT_CFG_KB_HEADER_MD-KB_USAGE, sy-vline,
  WA_COMT_CFG_KB_HEADER_MD-ORGTYPE, sy-vline,
  WA_COMT_CFG_KB_HEADER_MD-ORGID, sy-vline,
  WA_COMT_CFG_KB_HEADER_MD-ACTIVE, sy-vline,
  WA_COMT_CFG_KB_HEADER_MD-FROMDATE, sy-vline,
  WA_COMT_CFG_KB_HEADER_MD-TODATE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_COMT_CFG_KB_HEADER_MD 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_COMT_CFG_KB_HEADER_MD 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_COMT_CFG_KB_HEADER_MD INTO WA_COMT_CFG_KB_HEADER_MD.


*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 ALPHA, internal->external for field LOGSYS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_COMT_CFG_KB_HEADER_MD-LOGSYS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_COMT_CFG_KB_HEADER_MD-LOGSYS.
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_COMT_CFG_KB_HEADER_MD_STR, 
KB_KEY TYPE STRING,
NAME TYPE STRING,
LOGSYS TYPE STRING,
VERSION TYPE STRING,
KB_HIERARCHY TYPE STRING,
KB_USAGE TYPE STRING,
ORGTYPE TYPE STRING,
ORGID TYPE STRING,
ACTIVE TYPE STRING,
FROMDATE TYPE STRING,
TODATE TYPE STRING,
CREATOR TYPE STRING,
CHANGER TYPE STRING,
CHANGEDATE TYPE STRING,
BUILD TYPE STRING,
STATUS TYPE STRING,
KBID TYPE STRING,
PROFILE TYPE STRING,
CATEGORY TYPE STRING,
HIERARCHY_VERSION TYPE STRING,END OF T_EKKO_STR.
DATA: WA_COMT_CFG_KB_HEADER_MD_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_COMT_CFG_KB_HEADER_MD_STR-KB_KEY sy-vline 
WA_COMT_CFG_KB_HEADER_MD_STR-NAME sy-vline 
WA_COMT_CFG_KB_HEADER_MD_STR-LOGSYS sy-vline 
WA_COMT_CFG_KB_HEADER_MD_STR-VERSION sy-vline 
WA_COMT_CFG_KB_HEADER_MD_STR-KB_HIERARCHY sy-vline 
WA_COMT_CFG_KB_HEADER_MD_STR-KB_USAGE sy-vline 
WA_COMT_CFG_KB_HEADER_MD_STR-ORGTYPE sy-vline 
WA_COMT_CFG_KB_HEADER_MD_STR-ORGID sy-vline 
WA_COMT_CFG_KB_HEADER_MD_STR-ACTIVE sy-vline 
WA_COMT_CFG_KB_HEADER_MD_STR-FROMDATE sy-vline 
WA_COMT_CFG_KB_HEADER_MD_STR-TODATE sy-vline 
WA_COMT_CFG_KB_HEADER_MD_STR-CREATOR sy-vline 
WA_COMT_CFG_KB_HEADER_MD_STR-CHANGER sy-vline 
WA_COMT_CFG_KB_HEADER_MD_STR-CHANGEDATE sy-vline 
WA_COMT_CFG_KB_HEADER_MD_STR-BUILD sy-vline 
WA_COMT_CFG_KB_HEADER_MD_STR-STATUS sy-vline 
WA_COMT_CFG_KB_HEADER_MD_STR-KBID sy-vline 
WA_COMT_CFG_KB_HEADER_MD_STR-PROFILE sy-vline 
WA_COMT_CFG_KB_HEADER_MD_STR-CATEGORY sy-vline 
WA_COMT_CFG_KB_HEADER_MD_STR-HIERARCHY_VERSION sy-vline      INTO ld_text SEPARATED BY SPACE.

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