ABAP Select data from SAP table EK08MWDAT into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP EK08MWDAT 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 EK08MWDAT. 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 EK08MWDAT 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_EK08MWDAT TYPE STANDARD TABLE OF EK08MWDAT,
      WA_EK08MWDAT TYPE EK08MWDAT,
      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: <EK08MWDAT> TYPE EK08MWDAT.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_EK08MWDAT.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM EK08MWDAT
  INTO TABLE IT_EK08MWDAT.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM EK08MWDAT
*  INTO TABLE @DATA(IT_EK08MWDAT2).
*--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_EK08MWDAT INDEX 1 INTO DATA(WA_EK08MWDAT2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_EK08MWDAT ASSIGNING <EK08MWDAT>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<EK08MWDAT>-MWSKZ = 1.
<EK08MWDAT>-TXJCD = 1.
<EK08MWDAT>-SHKZG = 1.
<EK08MWDAT>-WRBTR = 1.
<EK08MWDAT>-WMWST = 1.

ENDLOOP.

LOOP AT IT_EK08MWDAT INTO WA_EK08MWDAT.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_EK08MWDAT-LIEFFN, sy-vline,
  WA_EK08MWDAT-LIEFFB, sy-vline,
  WA_EK08MWDAT-MWLIEF, sy-vline,
  WA_EK08MWDAT-FWNAV, sy-vline,
  WA_EK08MWDAT-BNKN, sy-vline,
  WA_EK08MWDAT-BNKB, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_EK08MWDAT 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_EK08MWDAT 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_EK08MWDAT INTO WA_EK08MWDAT.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_EK08MWDAT_STR, 
MWSKZ TYPE STRING,
TXJCD TYPE STRING,
SHKZG TYPE STRING,
WRBTR TYPE STRING,
WMWST TYPE STRING,
LIEFFN TYPE STRING,
LIEFFB TYPE STRING,
MWLIEF TYPE STRING,
FWNAV TYPE STRING,
BNKN TYPE STRING,
BNKB TYPE STRING,
MWBNK TYPE STRING,END OF T_EKKO_STR.
DATA: WA_EK08MWDAT_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_EK08MWDAT_STR-MWSKZ sy-vline 
WA_EK08MWDAT_STR-TXJCD sy-vline 
WA_EK08MWDAT_STR-SHKZG sy-vline 
WA_EK08MWDAT_STR-WRBTR sy-vline 
WA_EK08MWDAT_STR-WMWST sy-vline 
WA_EK08MWDAT_STR-LIEFFN sy-vline 
WA_EK08MWDAT_STR-LIEFFB sy-vline 
WA_EK08MWDAT_STR-MWLIEF sy-vline 
WA_EK08MWDAT_STR-FWNAV sy-vline 
WA_EK08MWDAT_STR-BNKN sy-vline 
WA_EK08MWDAT_STR-BNKB sy-vline 
WA_EK08MWDAT_STR-MWBNK sy-vline      INTO ld_text SEPARATED BY SPACE.

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