ABAP Select data from SAP table MCEKETBW into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MCEKETBW
*  INTO TABLE @DATA(IT_MCEKETBW2).
*--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_MCEKETBW INDEX 1 INTO DATA(WA_MCEKETBW2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MCEKETBW>-BWMNG = 1.
<MCEKETBW>-BWGEOO = 1.
<MCEKETBW>-BWGEO = 1.
<MCEKETBW>-BWGVO = 1.
<MCEKETBW>-BWGVP = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MCEKETBW-BWSUPKZ, sy-vline,
  WA_MCEKETBW-BWKZWI1, sy-vline,
  WA_MCEKETBW-BWKZWI2, sy-vline,
  WA_MCEKETBW-BWKZWI3, sy-vline,
  WA_MCEKETBW-BWKZWI4, sy-vline,
  WA_MCEKETBW-BWKZWI5, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MCEKETBW 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_MCEKETBW 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_MCEKETBW INTO WA_MCEKETBW.


*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_MCEKETBW_STR, 
BWMNG TYPE STRING,
BWGEOO TYPE STRING,
BWGEO TYPE STRING,
BWGVO TYPE STRING,
BWGVP TYPE STRING,
BWSUPKZ TYPE STRING,
BWKZWI1 TYPE STRING,
BWKZWI2 TYPE STRING,
BWKZWI3 TYPE STRING,
BWKZWI4 TYPE STRING,
BWKZWI5 TYPE STRING,
BWKZWI6 TYPE STRING,
BWNETWR TYPE STRING,
BWBRTWR TYPE STRING,
BWERZET TYPE STRING,
BWEFFWR TYPE STRING,
RTBWMNG TYPE STRING,
RTBWGEO TYPE STRING,
RTBWGVO TYPE STRING,
RTBWGVP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MCEKETBW_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_MCEKETBW_STR-BWMNG sy-vline 
WA_MCEKETBW_STR-BWGEOO sy-vline 
WA_MCEKETBW_STR-BWGEO sy-vline 
WA_MCEKETBW_STR-BWGVO sy-vline 
WA_MCEKETBW_STR-BWGVP sy-vline 
WA_MCEKETBW_STR-BWSUPKZ sy-vline 
WA_MCEKETBW_STR-BWKZWI1 sy-vline 
WA_MCEKETBW_STR-BWKZWI2 sy-vline 
WA_MCEKETBW_STR-BWKZWI3 sy-vline 
WA_MCEKETBW_STR-BWKZWI4 sy-vline 
WA_MCEKETBW_STR-BWKZWI5 sy-vline 
WA_MCEKETBW_STR-BWKZWI6 sy-vline 
WA_MCEKETBW_STR-BWNETWR sy-vline 
WA_MCEKETBW_STR-BWBRTWR sy-vline 
WA_MCEKETBW_STR-BWERZET sy-vline 
WA_MCEKETBW_STR-BWEFFWR sy-vline 
WA_MCEKETBW_STR-RTBWMNG sy-vline 
WA_MCEKETBW_STR-RTBWGEO sy-vline 
WA_MCEKETBW_STR-RTBWGVO sy-vline 
WA_MCEKETBW_STR-RTBWGVP sy-vline      INTO ld_text SEPARATED BY SPACE.

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