ABAP Select data from SAP table KONHM into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM KONHM
*  INTO TABLE @DATA(IT_KONHM2).
*--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_KONHM INDEX 1 INTO DATA(WA_KONHM2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<KONHM>-MANDT = 1.
<KONHM>-KNUMH = 1.
<KONHM>-EXPOFO = 1.
<KONHM>-TEXT = 1.
<KONHM>-ERNAM = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_KONHM-ERDAT, sy-vline,
  WA_KONHM-KVEWE, sy-vline,
  WA_KONHM-KOTABNR, sy-vline,
  WA_KONHM-KAPPL, sy-vline,
  WA_KONHM-KSCHL, sy-vline,
  WA_KONHM-DATAB, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_KONHM 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_KONHM 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_KONHM INTO WA_KONHM.


*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 KOTAB, internal->external for field KOTABNR
CALL FUNCTION 'CONVERSION_EXIT_KOTAB_OUTPUT'
  EXPORTING
    input =                      WA_KONHM-KOTABNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KONHM-KOTABNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ALT_BOM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_KONHM-ALT_BOM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KONHM-ALT_BOM.
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_KONHM_STR, 
MANDT TYPE STRING,
KNUMH TYPE STRING,
EXPOFO TYPE STRING,
TEXT TYPE STRING,
ERNAM TYPE STRING,
ERDAT TYPE STRING,
KVEWE TYPE STRING,
KOTABNR TYPE STRING,
KAPPL TYPE STRING,
KSCHL TYPE STRING,
DATAB TYPE STRING,
DATBI TYPE STRING,
PZUSTP TYPE STRING,
POSRT TYPE STRING,
AEDAT TYPE STRING,
AENAM TYPE STRING,
ASSOCUNIT TYPE STRING,
ASSOCROUND TYPE STRING,
COMMODITY TYPE STRING,
BOM_PROFILE TYPE STRING,
ALT_BOM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_KONHM_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_KONHM_STR-MANDT sy-vline 
WA_KONHM_STR-KNUMH sy-vline 
WA_KONHM_STR-EXPOFO sy-vline 
WA_KONHM_STR-TEXT sy-vline 
WA_KONHM_STR-ERNAM sy-vline 
WA_KONHM_STR-ERDAT sy-vline 
WA_KONHM_STR-KVEWE sy-vline 
WA_KONHM_STR-KOTABNR sy-vline 
WA_KONHM_STR-KAPPL sy-vline 
WA_KONHM_STR-KSCHL sy-vline 
WA_KONHM_STR-DATAB sy-vline 
WA_KONHM_STR-DATBI sy-vline 
WA_KONHM_STR-PZUSTP sy-vline 
WA_KONHM_STR-POSRT sy-vline 
WA_KONHM_STR-AEDAT sy-vline 
WA_KONHM_STR-AENAM sy-vline 
WA_KONHM_STR-ASSOCUNIT sy-vline 
WA_KONHM_STR-ASSOCROUND sy-vline 
WA_KONHM_STR-COMMODITY sy-vline 
WA_KONHM_STR-BOM_PROFILE sy-vline 
WA_KONHM_STR-ALT_BOM sy-vline      INTO ld_text SEPARATED BY SPACE.

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