ABAP Select data from SAP table MHNKO into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MHNKO
*  INTO TABLE @DATA(IT_MHNKO2).
*--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_MHNKO INDEX 1 INTO DATA(WA_MHNKO2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MHNKO>-MANDT = 1.
<MHNKO>-LAUFD = 1.
<MHNKO>-LAUFI = 1.
<MHNKO>-KOART = 1.
<MHNKO>-BUKRS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MHNKO-KUNNR, sy-vline,
  WA_MHNKO-LIFNR, sy-vline,
  WA_MHNKO-CPDKY, sy-vline,
  WA_MHNKO-SKNRZE, sy-vline,
  WA_MHNKO-SMABER, sy-vline,
  WA_MHNKO-SMAHSK, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MHNKO 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_MHNKO 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_MHNKO INTO WA_MHNKO.


*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 KUNNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MHNKO-KUNNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MHNKO-KUNNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LIFNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MHNKO-LIFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MHNKO-LIFNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field SKNRZE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MHNKO-SKNRZE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MHNKO-SKNRZE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KNRMA
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MHNKO-KNRMA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MHNKO-KNRMA.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC152, internal->external for field SALDO
CALL FUNCTION 'CONVERSION_EXIT_AC152_OUTPUT'
  EXPORTING
    input =                      WA_MHNKO-SALDO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MHNKO-SALDO.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC152, internal->external for field SALHW
CALL FUNCTION 'CONVERSION_EXIT_AC152_OUTPUT'
  EXPORTING
    input =                      WA_MHNKO-SALHW
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MHNKO-SALHW.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC152, internal->external for field GSFBT
CALL FUNCTION 'CONVERSION_EXIT_AC152_OUTPUT'
  EXPORTING
    input =                      WA_MHNKO-GSFBT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MHNKO-GSFBT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC152, internal->external for field GSNBT
CALL FUNCTION 'CONVERSION_EXIT_AC152_OUTPUT'
  EXPORTING
    input =                      WA_MHNKO-GSNBT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MHNKO-GSNBT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC152, internal->external for field FAEBT
CALL FUNCTION 'CONVERSION_EXIT_AC152_OUTPUT'
  EXPORTING
    input =                      WA_MHNKO-FAEBT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MHNKO-FAEBT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC152, internal->external for field FAEHW
CALL FUNCTION 'CONVERSION_EXIT_AC152_OUTPUT'
  EXPORTING
    input =                      WA_MHNKO-FAEHW
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MHNKO-FAEHW.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC152, internal->external for field ZINBT
CALL FUNCTION 'CONVERSION_EXIT_AC152_OUTPUT'
  EXPORTING
    input =                      WA_MHNKO-ZINBT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MHNKO-ZINBT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC152, internal->external for field ZINHW
CALL FUNCTION 'CONVERSION_EXIT_AC152_OUTPUT'
  EXPORTING
    input =                      WA_MHNKO-ZINHW
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MHNKO-ZINHW.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field VERTN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MHNKO-VERTN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MHNKO-VERTN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit IMKEY, internal->external for field IMKEY
CALL FUNCTION 'CONVERSION_EXIT_IMKEY_OUTPUT'
  EXPORTING
    input =                      WA_MHNKO-IMKEY
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MHNKO-IMKEY.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC152, internal->external for field FAMSM
CALL FUNCTION 'CONVERSION_EXIT_AC152_OUTPUT'
  EXPORTING
    input =                      WA_MHNKO-FAMSM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MHNKO-FAMSM.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC152, internal->external for field FAMSH
CALL FUNCTION 'CONVERSION_EXIT_AC152_OUTPUT'
  EXPORTING
    input =                      WA_MHNKO-FAMSH
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MHNKO-FAMSH.
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_MHNKO_STR, 
MANDT TYPE STRING,
LAUFD TYPE STRING,
LAUFI TYPE STRING,
KOART TYPE STRING,
BUKRS TYPE STRING,
KUNNR TYPE STRING,
LIFNR TYPE STRING,
CPDKY TYPE STRING,
SKNRZE TYPE STRING,
SMABER TYPE STRING,
SMAHSK TYPE STRING,
BUSAB TYPE STRING,
VERSN TYPE STRING,
AUSDT TYPE STRING,
GRDAT TYPE STRING,
KNRMA TYPE STRING,
GMVDT TYPE STRING,
MAHNA TYPE STRING,
MAHNS TYPE STRING,
VZSKZ TYPE STRING,
WAERS TYPE STRING,
SALDO TYPE STRING,
SALHW TYPE STRING,
GSFBT TYPE STRING,
GSNBT TYPE STRING,
FAEBT TYPE STRING,
FAEHW TYPE STRING,
XMFLG TYPE STRING,
MANSP TYPE STRING,
MAHSK TYPE STRING,
ZINBT TYPE STRING,
ZINHW TYPE STRING,
XZINS TYPE STRING,
VERTN TYPE STRING,
VERTT TYPE STRING,
IMKEY TYPE STRING,
FAMSM TYPE STRING,
FAMSH TYPE STRING,
PSTLZ TYPE STRING,
ORT01 TYPE STRING,
STRAS TYPE STRING,
PFACH TYPE STRING,
LAND1 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MHNKO_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_MHNKO_STR-MANDT sy-vline 
WA_MHNKO_STR-LAUFD sy-vline 
WA_MHNKO_STR-LAUFI sy-vline 
WA_MHNKO_STR-KOART sy-vline 
WA_MHNKO_STR-BUKRS sy-vline 
WA_MHNKO_STR-KUNNR sy-vline 
WA_MHNKO_STR-LIFNR sy-vline 
WA_MHNKO_STR-CPDKY sy-vline 
WA_MHNKO_STR-SKNRZE sy-vline 
WA_MHNKO_STR-SMABER sy-vline 
WA_MHNKO_STR-SMAHSK sy-vline 
WA_MHNKO_STR-BUSAB sy-vline 
WA_MHNKO_STR-VERSN sy-vline 
WA_MHNKO_STR-AUSDT sy-vline 
WA_MHNKO_STR-GRDAT sy-vline 
WA_MHNKO_STR-KNRMA sy-vline 
WA_MHNKO_STR-GMVDT sy-vline 
WA_MHNKO_STR-MAHNA sy-vline 
WA_MHNKO_STR-MAHNS sy-vline 
WA_MHNKO_STR-VZSKZ sy-vline 
WA_MHNKO_STR-WAERS sy-vline 
WA_MHNKO_STR-SALDO sy-vline 
WA_MHNKO_STR-SALHW sy-vline 
WA_MHNKO_STR-GSFBT sy-vline 
WA_MHNKO_STR-GSNBT sy-vline 
WA_MHNKO_STR-FAEBT sy-vline 
WA_MHNKO_STR-FAEHW sy-vline 
WA_MHNKO_STR-XMFLG sy-vline 
WA_MHNKO_STR-MANSP sy-vline 
WA_MHNKO_STR-MAHSK sy-vline 
WA_MHNKO_STR-ZINBT sy-vline 
WA_MHNKO_STR-ZINHW sy-vline 
WA_MHNKO_STR-XZINS sy-vline 
WA_MHNKO_STR-VERTN sy-vline 
WA_MHNKO_STR-VERTT sy-vline 
WA_MHNKO_STR-IMKEY sy-vline 
WA_MHNKO_STR-FAMSM sy-vline 
WA_MHNKO_STR-FAMSH sy-vline 
WA_MHNKO_STR-PSTLZ sy-vline 
WA_MHNKO_STR-ORT01 sy-vline 
WA_MHNKO_STR-STRAS sy-vline 
WA_MHNKO_STR-PFACH sy-vline 
WA_MHNKO_STR-LAND1 sy-vline      INTO ld_text SEPARATED BY SPACE.

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