ABAP Select data from SAP table WMFU into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WMFU
*  INTO TABLE @DATA(IT_WMFU2).
*--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_WMFU INDEX 1 INTO DATA(WA_WMFU2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WMFU>-MANDT = 1.
<WMFU>-MFCNR = 1.
<WMFU>-POSNR = 1.
<WMFU>-UPOSN = 1.
<WMFU>-VRKME = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WMFU-MDPRZ, sy-vline,
  WA_WMFU-MDWRT, sy-vline,
  WA_WMFU-MDROS, sy-vline,
  WA_WMFU-DATAB, sy-vline,
  WA_WMFU-VKKPS, sy-vline,
  WA_WMFU-PSALM, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WMFU 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_WMFU 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_WMFU INTO WA_WMFU.


*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 CUNIT, internal->external for field VRKME
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_WMFU-VRKME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WMFU-VRKME.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field BBPRM
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_WMFU-BBPRM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WMFU-BBPRM.
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_WMFU_STR, 
MANDT TYPE STRING,
MFCNR TYPE STRING,
POSNR TYPE STRING,
UPOSN TYPE STRING,
VRKME TYPE STRING,
MDPRZ TYPE STRING,
MDWRT TYPE STRING,
MDROS TYPE STRING,
DATAB TYPE STRING,
VKKPS TYPE STRING,
PSALM TYPE STRING,
PSALW TYPE STRING,
PSALC TYPE STRING,
PSALP TYPE STRING,
PANFM TYPE STRING,
CUREP TYPE STRING,
EPEIN TYPE STRING,
BBPRM TYPE STRING,
CURVP TYPE STRING,
EKPGR TYPE STRING,
EKPNN TYPE STRING,
VKPBR TYPE STRING,
ENDPR TYPE STRING,
SPANE TYPE STRING,
SPABR TYPE STRING,
SPWRT TYPE STRING,
AUFSG TYPE STRING,
VSPAN TYPE STRING,
VSPAB TYPE STRING,
VAUFS TYPE STRING,
VABGP TYPE STRING,
SPANS TYPE STRING,
MDPER TYPE STRING,
ERNAM TYPE STRING,
ERDAT TYPE STRING,
AENAM TYPE STRING,
AEDAT TYPE STRING,
PRESW TYPE STRING,
PRESM TYPE STRING,
MAHIT TYPE STRING,
PSALA TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WMFU_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_WMFU_STR-MANDT sy-vline 
WA_WMFU_STR-MFCNR sy-vline 
WA_WMFU_STR-POSNR sy-vline 
WA_WMFU_STR-UPOSN sy-vline 
WA_WMFU_STR-VRKME sy-vline 
WA_WMFU_STR-MDPRZ sy-vline 
WA_WMFU_STR-MDWRT sy-vline 
WA_WMFU_STR-MDROS sy-vline 
WA_WMFU_STR-DATAB sy-vline 
WA_WMFU_STR-VKKPS sy-vline 
WA_WMFU_STR-PSALM sy-vline 
WA_WMFU_STR-PSALW sy-vline 
WA_WMFU_STR-PSALC sy-vline 
WA_WMFU_STR-PSALP sy-vline 
WA_WMFU_STR-PANFM sy-vline 
WA_WMFU_STR-CUREP sy-vline 
WA_WMFU_STR-EPEIN sy-vline 
WA_WMFU_STR-BBPRM sy-vline 
WA_WMFU_STR-CURVP sy-vline 
WA_WMFU_STR-EKPGR sy-vline 
WA_WMFU_STR-EKPNN sy-vline 
WA_WMFU_STR-VKPBR sy-vline 
WA_WMFU_STR-ENDPR sy-vline 
WA_WMFU_STR-SPANE sy-vline 
WA_WMFU_STR-SPABR sy-vline 
WA_WMFU_STR-SPWRT sy-vline 
WA_WMFU_STR-AUFSG sy-vline 
WA_WMFU_STR-VSPAN sy-vline 
WA_WMFU_STR-VSPAB sy-vline 
WA_WMFU_STR-VAUFS sy-vline 
WA_WMFU_STR-VABGP sy-vline 
WA_WMFU_STR-SPANS sy-vline 
WA_WMFU_STR-MDPER sy-vline 
WA_WMFU_STR-ERNAM sy-vline 
WA_WMFU_STR-ERDAT sy-vline 
WA_WMFU_STR-AENAM sy-vline 
WA_WMFU_STR-AEDAT sy-vline 
WA_WMFU_STR-PRESW sy-vline 
WA_WMFU_STR-PRESM sy-vline 
WA_WMFU_STR-MAHIT sy-vline 
WA_WMFU_STR-PSALA sy-vline      INTO ld_text SEPARATED BY SPACE.

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