ABAP Select data from SAP table MWWS3 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP MWWS3 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 MWWS3. 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 MWWS3 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_MWWS3 TYPE STANDARD TABLE OF MWWS3,
      WA_MWWS3 TYPE MWWS3,
      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: <MWWS3> TYPE MWWS3.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_MWWS3.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM MWWS3
  INTO TABLE IT_MWWS3.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MWWS3
*  INTO TABLE @DATA(IT_MWWS32).
*--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_MWWS3 INDEX 1 INTO DATA(WA_MWWS32).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_MWWS3 ASSIGNING <MWWS3>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MWWS3>-VKORG = 1.
<MWWS3>-VTWEG = 1.
<MWWS3>-VERSG = 1.
<MWWS3>-BONUS = 1.
<MWWS3>-PROVG = 1.

ENDLOOP.

LOOP AT IT_MWWS3 INTO WA_MWWS3.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MWWS3-SKTOF, sy-vline,
  WA_MWWS3-VMSTA, sy-vline,
  WA_MWWS3-VMSTD, sy-vline,
  WA_MWWS3-AUMNG, sy-vline,
  WA_MWWS3-LFMNG, sy-vline,
  WA_MWWS3-EFMNG, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MWWS3 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_MWWS3 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_MWWS3 INTO WA_MWWS3.


*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 SCHME
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MWWS3-SCHME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MWWS3-SCHME.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field VRKME
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MWWS3-VRKME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MWWS3-VRKME.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field PMATN
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_MWWS3-PMATN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MWWS3-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_MWWS3_STR, 
VKORG TYPE STRING,
VTWEG TYPE STRING,
VERSG TYPE STRING,
BONUS TYPE STRING,
PROVG TYPE STRING,
SKTOF TYPE STRING,
VMSTA TYPE STRING,
VMSTD TYPE STRING,
AUMNG TYPE STRING,
LFMNG TYPE STRING,
EFMNG TYPE STRING,
SCMNG TYPE STRING,
SCHME TYPE STRING,
VRKME TYPE STRING,
MTPOS TYPE STRING,
DWERK TYPE STRING,
PRODH TYPE STRING,
PMATN TYPE STRING,
KONDM TYPE STRING,
KTGRM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MWWS3_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_MWWS3_STR-VKORG sy-vline 
WA_MWWS3_STR-VTWEG sy-vline 
WA_MWWS3_STR-VERSG sy-vline 
WA_MWWS3_STR-BONUS sy-vline 
WA_MWWS3_STR-PROVG sy-vline 
WA_MWWS3_STR-SKTOF sy-vline 
WA_MWWS3_STR-VMSTA sy-vline 
WA_MWWS3_STR-VMSTD sy-vline 
WA_MWWS3_STR-AUMNG sy-vline 
WA_MWWS3_STR-LFMNG sy-vline 
WA_MWWS3_STR-EFMNG sy-vline 
WA_MWWS3_STR-SCMNG sy-vline 
WA_MWWS3_STR-SCHME sy-vline 
WA_MWWS3_STR-VRKME sy-vline 
WA_MWWS3_STR-MTPOS sy-vline 
WA_MWWS3_STR-DWERK sy-vline 
WA_MWWS3_STR-PRODH sy-vline 
WA_MWWS3_STR-PMATN sy-vline 
WA_MWWS3_STR-KONDM sy-vline 
WA_MWWS3_STR-KTGRM sy-vline      INTO ld_text SEPARATED BY SPACE.

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