ABAP Select data from SAP table MHNK into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MHNK
*  INTO TABLE @DATA(IT_MHNK2).
*--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_MHNK INDEX 1 INTO DATA(WA_MHNK2).


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

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

ENDLOOP.

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

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


*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_MHNK-KUNNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MHNK-KUNNR.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

*Conversion exit SMENR, internal->external for field SMENR
CALL FUNCTION 'CONVERSION_EXIT_SMENR_OUTPUT'
  EXPORTING
    input =                      WA_MHNK-SMENR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MHNK-SMENR.
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_MHNK_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,
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,
MGRUP 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,
AVSID TYPE STRING,
APPLK TYPE STRING,
CPDKY_GRP TYPE STRING,
CPDKY_CPD TYPE STRING,
MHNGH TYPE STRING,
MHNGF TYPE STRING,
PRNFORM TYPE STRING,
PRNNACHA TYPE STRING,
PRNDT TYPE STRING,
PRNDT_BEFORE TYPE STRING,
SDUNNDOCLO TYPE STRING,
SRANLPOSTLO TYPE STRING,
DBUDATLO TYPE STRING,
SWENR TYPE STRING,
SMENR TYPE STRING,
PSOMD TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MHNK_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_MHNK_STR-MANDT sy-vline 
WA_MHNK_STR-LAUFD sy-vline 
WA_MHNK_STR-LAUFI sy-vline 
WA_MHNK_STR-KOART sy-vline 
WA_MHNK_STR-BUKRS sy-vline 
WA_MHNK_STR-KUNNR sy-vline 
WA_MHNK_STR-LIFNR sy-vline 
WA_MHNK_STR-CPDKY sy-vline 
WA_MHNK_STR-SKNRZE sy-vline 
WA_MHNK_STR-SMABER sy-vline 
WA_MHNK_STR-SMAHSK sy-vline 
WA_MHNK_STR-BUSAB sy-vline 
WA_MHNK_STR-AUSDT sy-vline 
WA_MHNK_STR-GRDAT sy-vline 
WA_MHNK_STR-KNRMA sy-vline 
WA_MHNK_STR-GMVDT sy-vline 
WA_MHNK_STR-MAHNA sy-vline 
WA_MHNK_STR-MAHNS sy-vline 
WA_MHNK_STR-VZSKZ sy-vline 
WA_MHNK_STR-WAERS sy-vline 
WA_MHNK_STR-SALDO sy-vline 
WA_MHNK_STR-SALHW sy-vline 
WA_MHNK_STR-GSFBT sy-vline 
WA_MHNK_STR-GSNBT sy-vline 
WA_MHNK_STR-FAEBT sy-vline 
WA_MHNK_STR-FAEHW sy-vline 
WA_MHNK_STR-XMFLG sy-vline 
WA_MHNK_STR-MANSP sy-vline 
WA_MHNK_STR-MAHSK sy-vline 
WA_MHNK_STR-ZINBT sy-vline 
WA_MHNK_STR-ZINHW sy-vline 
WA_MHNK_STR-XZINS sy-vline 
WA_MHNK_STR-MGRUP sy-vline 
WA_MHNK_STR-VERTN sy-vline 
WA_MHNK_STR-VERTT sy-vline 
WA_MHNK_STR-IMKEY sy-vline 
WA_MHNK_STR-FAMSM sy-vline 
WA_MHNK_STR-FAMSH sy-vline 
WA_MHNK_STR-PSTLZ sy-vline 
WA_MHNK_STR-ORT01 sy-vline 
WA_MHNK_STR-STRAS sy-vline 
WA_MHNK_STR-PFACH sy-vline 
WA_MHNK_STR-LAND1 sy-vline 
WA_MHNK_STR-AVSID sy-vline 
WA_MHNK_STR-APPLK sy-vline 
WA_MHNK_STR-CPDKY_GRP sy-vline 
WA_MHNK_STR-CPDKY_CPD sy-vline 
WA_MHNK_STR-MHNGH sy-vline 
WA_MHNK_STR-MHNGF sy-vline 
WA_MHNK_STR-PRNFORM sy-vline 
WA_MHNK_STR-PRNNACHA sy-vline 
WA_MHNK_STR-PRNDT sy-vline 
WA_MHNK_STR-PRNDT_BEFORE sy-vline 
WA_MHNK_STR-SDUNNDOCLO sy-vline 
WA_MHNK_STR-SRANLPOSTLO sy-vline 
WA_MHNK_STR-DBUDATLO sy-vline 
WA_MHNK_STR-SWENR sy-vline 
WA_MHNK_STR-SMENR sy-vline 
WA_MHNK_STR-PSOMD sy-vline      INTO ld_text SEPARATED BY SPACE.

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