ABAP Select data from SAP table MWMKPF into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MWMKPF
*  INTO TABLE @DATA(IT_MWMKPF2).
*--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_MWMKPF INDEX 1 INTO DATA(WA_MWMKPF2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MWMKPF>-MANDT = 1.
<MWMKPF>-CPUDT = 1.
<MWMKPF>-CPUTM = 1.
<MWMKPF>-MBLNR = 1.
<MWMKPF>-MJAHR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MWMKPF-VGART, sy-vline,
  WA_MWMKPF-BLART, sy-vline,
  WA_MWMKPF-BLAUM, sy-vline,
  WA_MWMKPF-BLDAT, sy-vline,
  WA_MWMKPF-BUDAT, sy-vline,
  WA_MWMKPF-AEDAT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MWMKPF 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_MWMKPF 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_MWMKPF INTO WA_MWMKPF.


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

*Conversion exit GJAHR, internal->external for field MJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_MWMKPF-MJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MWMKPF-MJAHR.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit ALPHA, internal->external for field AWSYS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MWMKPF-AWSYS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MWMKPF-AWSYS.
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_MWMKPF_STR, 
MANDT TYPE STRING,
CPUDT TYPE STRING,
CPUTM TYPE STRING,
MBLNR TYPE STRING,
MJAHR TYPE STRING,
VGART TYPE STRING,
BLART TYPE STRING,
BLAUM TYPE STRING,
BLDAT TYPE STRING,
BUDAT TYPE STRING,
AEDAT TYPE STRING,
USNAM TYPE STRING,
TCODE TYPE STRING,
XBLNR TYPE STRING,
BKTXT TYPE STRING,
FRATH TYPE STRING,
FRBNR TYPE STRING,
WEVER TYPE STRING,
XABLN TYPE STRING,
AWSYS TYPE STRING,
BLA2D TYPE STRING,
TCODE2 TYPE STRING,
XWERR TYPE STRING,
MSGID TYPE STRING,
MSGTY TYPE STRING,
MSGNO TYPE STRING,
MSGV1 TYPE STRING,
MSGV2 TYPE STRING,
MSGV3 TYPE STRING,
MSGV4 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MWMKPF_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_MWMKPF_STR-MANDT sy-vline 
WA_MWMKPF_STR-CPUDT sy-vline 
WA_MWMKPF_STR-CPUTM sy-vline 
WA_MWMKPF_STR-MBLNR sy-vline 
WA_MWMKPF_STR-MJAHR sy-vline 
WA_MWMKPF_STR-VGART sy-vline 
WA_MWMKPF_STR-BLART sy-vline 
WA_MWMKPF_STR-BLAUM sy-vline 
WA_MWMKPF_STR-BLDAT sy-vline 
WA_MWMKPF_STR-BUDAT sy-vline 
WA_MWMKPF_STR-AEDAT sy-vline 
WA_MWMKPF_STR-USNAM sy-vline 
WA_MWMKPF_STR-TCODE sy-vline 
WA_MWMKPF_STR-XBLNR sy-vline 
WA_MWMKPF_STR-BKTXT sy-vline 
WA_MWMKPF_STR-FRATH sy-vline 
WA_MWMKPF_STR-FRBNR sy-vline 
WA_MWMKPF_STR-WEVER sy-vline 
WA_MWMKPF_STR-XABLN sy-vline 
WA_MWMKPF_STR-AWSYS sy-vline 
WA_MWMKPF_STR-BLA2D sy-vline 
WA_MWMKPF_STR-TCODE2 sy-vline 
WA_MWMKPF_STR-XWERR sy-vline 
WA_MWMKPF_STR-MSGID sy-vline 
WA_MWMKPF_STR-MSGTY sy-vline 
WA_MWMKPF_STR-MSGNO sy-vline 
WA_MWMKPF_STR-MSGV1 sy-vline 
WA_MWMKPF_STR-MSGV2 sy-vline 
WA_MWMKPF_STR-MSGV3 sy-vline 
WA_MWMKPF_STR-MSGV4 sy-vline      INTO ld_text SEPARATED BY SPACE.

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