ABAP Select data from SAP table WMFP into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WMFP
*  INTO TABLE @DATA(IT_WMFP2).
*--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_WMFP INDEX 1 INTO DATA(WA_WMFP2).


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

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

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WMFP-VKORG, sy-vline,
  WA_WMFP-VTWEG, sy-vline,
  WA_WMFP-VTLCU, sy-vline,
  WA_WMFP-ATTYP, sy-vline,
  WA_WMFP-MPRNR, sy-vline,
  WA_WMFP-SATNR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WMFP 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_WMFP 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_WMFP INTO WA_WMFP.


*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 MATN1, internal->external for field ARTNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_WMFP-ARTNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WMFP-ARTNR.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit MATN1, internal->external for field SATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_WMFP-SATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WMFP-SATNR.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

*Conversion exit MATN1, internal->external for field PMATN
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_WMFP-PMATN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WMFP-PMATN.
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_WMFP_STR, 
MANDT TYPE STRING,
MFCNR TYPE STRING,
POSNR TYPE STRING,
ARTNR TYPE STRING,
VRKME TYPE STRING,
VKORG TYPE STRING,
VTWEG TYPE STRING,
VTLCU TYPE STRING,
ATTYP TYPE STRING,
MPRNR TYPE STRING,
SATNR TYPE STRING,
AKTNR TYPE STRING,
SAITY TYPE STRING,
SAISO TYPE STRING,
SAISJ TYPE STRING,
DATAB TYPE STRING,
PSALM TYPE STRING,
PANFM TYPE STRING,
CUREP TYPE STRING,
EPEIN TYPE STRING,
BBPRM TYPE STRING,
CURVP TYPE STRING,
EKPGR TYPE STRING,
EKWVK TYPE STRING,
EKPNN TYPE STRING,
VKPBR TYPE STRING,
ENDPR TYPE STRING,
PRESM TYPE STRING,
PSALC TYPE STRING,
PSALP TYPE STRING,
PSALW TYPE STRING,
PRESW TYPE STRING,
CMUIV TYPE STRING,
MAHIT TYPE STRING,
ERNAM TYPE STRING,
ERDAT TYPE STRING,
AENAM TYPE STRING,
AEDAT TYPE STRING,
LIFNR TYPE STRING,
PMATN TYPE STRING,
VKPKZ TYPE STRING,
SPWRT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WMFP_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_WMFP_STR-MANDT sy-vline 
WA_WMFP_STR-MFCNR sy-vline 
WA_WMFP_STR-POSNR sy-vline 
WA_WMFP_STR-ARTNR sy-vline 
WA_WMFP_STR-VRKME sy-vline 
WA_WMFP_STR-VKORG sy-vline 
WA_WMFP_STR-VTWEG sy-vline 
WA_WMFP_STR-VTLCU sy-vline 
WA_WMFP_STR-ATTYP sy-vline 
WA_WMFP_STR-MPRNR sy-vline 
WA_WMFP_STR-SATNR sy-vline 
WA_WMFP_STR-AKTNR sy-vline 
WA_WMFP_STR-SAITY sy-vline 
WA_WMFP_STR-SAISO sy-vline 
WA_WMFP_STR-SAISJ sy-vline 
WA_WMFP_STR-DATAB sy-vline 
WA_WMFP_STR-PSALM sy-vline 
WA_WMFP_STR-PANFM sy-vline 
WA_WMFP_STR-CUREP sy-vline 
WA_WMFP_STR-EPEIN sy-vline 
WA_WMFP_STR-BBPRM sy-vline 
WA_WMFP_STR-CURVP sy-vline 
WA_WMFP_STR-EKPGR sy-vline 
WA_WMFP_STR-EKWVK sy-vline 
WA_WMFP_STR-EKPNN sy-vline 
WA_WMFP_STR-VKPBR sy-vline 
WA_WMFP_STR-ENDPR sy-vline 
WA_WMFP_STR-PRESM sy-vline 
WA_WMFP_STR-PSALC sy-vline 
WA_WMFP_STR-PSALP sy-vline 
WA_WMFP_STR-PSALW sy-vline 
WA_WMFP_STR-PRESW sy-vline 
WA_WMFP_STR-CMUIV sy-vline 
WA_WMFP_STR-MAHIT sy-vline 
WA_WMFP_STR-ERNAM sy-vline 
WA_WMFP_STR-ERDAT sy-vline 
WA_WMFP_STR-AENAM sy-vline 
WA_WMFP_STR-AEDAT sy-vline 
WA_WMFP_STR-LIFNR sy-vline 
WA_WMFP_STR-PMATN sy-vline 
WA_WMFP_STR-VKPKZ sy-vline 
WA_WMFP_STR-SPWRT sy-vline      INTO ld_text SEPARATED BY SPACE.

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