ABAP Select data from SAP table MEV_S_WL_MM_DATA into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MEV_S_WL_MM_DATA
*  INTO TABLE @DATA(IT_MEV_S_WL_MM_DATA2).
*--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_MEV_S_WL_MM_DATA INDEX 1 INTO DATA(WA_MEV_S_WL_MM_DATA2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MEV_S_WL_MM_DATA>-WEMNG = 1.
<MEV_S_WL_MM_DATA>-BPWEM = 1.
<MEV_S_WL_MM_DATA>-WEWWR = 1.
<MEV_S_WL_MM_DATA>-WEWRT = 1.
<MEV_S_WL_MM_DATA>-REMNG = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MEV_S_WL_MM_DATA-REFWR, sy-vline,
  WA_MEV_S_WL_MM_DATA-AREWW, sy-vline,
  WA_MEV_S_WL_MM_DATA-REEWR, sy-vline,
  WA_MEV_S_WL_MM_DATA-AREWR, sy-vline,
  WA_MEV_S_WL_MM_DATA-BPMNG, sy-vline,
  WA_MEV_S_WL_MM_DATA-BPRME, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MEV_S_WL_MM_DATA 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_MEV_S_WL_MM_DATA 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_MEV_S_WL_MM_DATA INTO WA_MEV_S_WL_MM_DATA.


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

*Conversion exit EXCRT, internal->external for field KURSF
CALL FUNCTION 'CONVERSION_EXIT_EXCRT_OUTPUT'
  EXPORTING
    input =                      WA_MEV_S_WL_MM_DATA-KURSF
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MEV_S_WL_MM_DATA-KURSF.
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_MEV_S_WL_MM_DATA_STR, 
WEMNG TYPE STRING,
BPWEM TYPE STRING,
WEWWR TYPE STRING,
WEWRT TYPE STRING,
REMNG TYPE STRING,
REFWR TYPE STRING,
AREWW TYPE STRING,
REEWR TYPE STRING,
AREWR TYPE STRING,
BPMNG TYPE STRING,
BPRME TYPE STRING,
BPUMN TYPE STRING,
BPUMZ TYPE STRING,
KNUMV TYPE STRING,
KPOSN TYPE STRING,
XBLNR TYPE STRING,
BWTAR TYPE STRING,
LBKUM TYPE STRING,
WEBUD TYPE STRING,
KURSF TYPE STRING,
WWERT TYPE STRING,
KURST TYPE STRING,
KUFIX TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MEV_S_WL_MM_DATA_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_MEV_S_WL_MM_DATA_STR-WEMNG sy-vline 
WA_MEV_S_WL_MM_DATA_STR-BPWEM sy-vline 
WA_MEV_S_WL_MM_DATA_STR-WEWWR sy-vline 
WA_MEV_S_WL_MM_DATA_STR-WEWRT sy-vline 
WA_MEV_S_WL_MM_DATA_STR-REMNG sy-vline 
WA_MEV_S_WL_MM_DATA_STR-REFWR sy-vline 
WA_MEV_S_WL_MM_DATA_STR-AREWW sy-vline 
WA_MEV_S_WL_MM_DATA_STR-REEWR sy-vline 
WA_MEV_S_WL_MM_DATA_STR-AREWR sy-vline 
WA_MEV_S_WL_MM_DATA_STR-BPMNG sy-vline 
WA_MEV_S_WL_MM_DATA_STR-BPRME sy-vline 
WA_MEV_S_WL_MM_DATA_STR-BPUMN sy-vline 
WA_MEV_S_WL_MM_DATA_STR-BPUMZ sy-vline 
WA_MEV_S_WL_MM_DATA_STR-KNUMV sy-vline 
WA_MEV_S_WL_MM_DATA_STR-KPOSN sy-vline 
WA_MEV_S_WL_MM_DATA_STR-XBLNR sy-vline 
WA_MEV_S_WL_MM_DATA_STR-BWTAR sy-vline 
WA_MEV_S_WL_MM_DATA_STR-LBKUM sy-vline 
WA_MEV_S_WL_MM_DATA_STR-WEBUD sy-vline 
WA_MEV_S_WL_MM_DATA_STR-KURSF sy-vline 
WA_MEV_S_WL_MM_DATA_STR-WWERT sy-vline 
WA_MEV_S_WL_MM_DATA_STR-KURST sy-vline 
WA_MEV_S_WL_MM_DATA_STR-KUFIX sy-vline      INTO ld_text SEPARATED BY SPACE.

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