ABAP Select data from SAP table MCEKETWWS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MCEKETWWS
*  INTO TABLE @DATA(IT_MCEKETWWS2).
*--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_MCEKETWWS INDEX 1 INTO DATA(WA_MCEKETWWS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MCEKETWWS>-BBZMNG = 1.
<MCEKETWWS>-BBZGEO = 1.
<MCEKETWWS>-BBZGVO = 1.
<MCEKETWWS>-BBZGVP = 1.
<MCEKETWWS>-BBZGEW = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MCEKETWWS-BBZVOL, sy-vline,
  WA_MCEKETWWS-BBAMNG, sy-vline,
  WA_MCEKETWWS-BBAGEO, sy-vline,
  WA_MCEKETWWS-BBAGVO, sy-vline,
  WA_MCEKETWWS-BBAGVP, sy-vline,
  WA_MCEKETWWS-BBAGEW, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MCEKETWWS 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_MCEKETWWS 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_MCEKETWWS INTO WA_MCEKETWWS.


*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_MCEKETWWS_STR, 
BBZMNG TYPE STRING,
BBZGEO TYPE STRING,
BBZGVO TYPE STRING,
BBZGVP TYPE STRING,
BBZGEW TYPE STRING,
BBZVOL TYPE STRING,
BBAMNG TYPE STRING,
BBAGEO TYPE STRING,
BBAGVO TYPE STRING,
BBAGVP TYPE STRING,
BBAGEW TYPE STRING,
BBAVOL TYPE STRING,
DBWMNG TYPE STRING,
DBWGEO TYPE STRING,
DBWGVO TYPE STRING,
DBWGVP TYPE STRING,
DBWGEW TYPE STRING,
DBWVOL TYPE STRING,
BIWMNG TYPE STRING,
BIWGEO TYPE STRING,
BIWGVO TYPE STRING,
BIWGVP TYPE STRING,
KZWI1 TYPE STRING,
KZWI2 TYPE STRING,
KZWI3 TYPE STRING,
KZWI4 TYPE STRING,
KZWI5 TYPE STRING,
KZWI6 TYPE STRING,
NETWR TYPE STRING,
BRTWR TYPE STRING,
ERZET TYPE STRING,
HSUPKZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MCEKETWWS_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_MCEKETWWS_STR-BBZMNG sy-vline 
WA_MCEKETWWS_STR-BBZGEO sy-vline 
WA_MCEKETWWS_STR-BBZGVO sy-vline 
WA_MCEKETWWS_STR-BBZGVP sy-vline 
WA_MCEKETWWS_STR-BBZGEW sy-vline 
WA_MCEKETWWS_STR-BBZVOL sy-vline 
WA_MCEKETWWS_STR-BBAMNG sy-vline 
WA_MCEKETWWS_STR-BBAGEO sy-vline 
WA_MCEKETWWS_STR-BBAGVO sy-vline 
WA_MCEKETWWS_STR-BBAGVP sy-vline 
WA_MCEKETWWS_STR-BBAGEW sy-vline 
WA_MCEKETWWS_STR-BBAVOL sy-vline 
WA_MCEKETWWS_STR-DBWMNG sy-vline 
WA_MCEKETWWS_STR-DBWGEO sy-vline 
WA_MCEKETWWS_STR-DBWGVO sy-vline 
WA_MCEKETWWS_STR-DBWGVP sy-vline 
WA_MCEKETWWS_STR-DBWGEW sy-vline 
WA_MCEKETWWS_STR-DBWVOL sy-vline 
WA_MCEKETWWS_STR-BIWMNG sy-vline 
WA_MCEKETWWS_STR-BIWGEO sy-vline 
WA_MCEKETWWS_STR-BIWGVO sy-vline 
WA_MCEKETWWS_STR-BIWGVP sy-vline 
WA_MCEKETWWS_STR-KZWI1 sy-vline 
WA_MCEKETWWS_STR-KZWI2 sy-vline 
WA_MCEKETWWS_STR-KZWI3 sy-vline 
WA_MCEKETWWS_STR-KZWI4 sy-vline 
WA_MCEKETWWS_STR-KZWI5 sy-vline 
WA_MCEKETWWS_STR-KZWI6 sy-vline 
WA_MCEKETWWS_STR-NETWR sy-vline 
WA_MCEKETWWS_STR-BRTWR sy-vline 
WA_MCEKETWWS_STR-ERZET sy-vline 
WA_MCEKETWWS_STR-HSUPKZ sy-vline      INTO ld_text SEPARATED BY SPACE.

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