ABAP Select data from SAP table MCEKKZ into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MCEKKZ
*  INTO TABLE @DATA(IT_MCEKKZ2).
*--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_MCEKKZ INDEX 1 INTO DATA(WA_MCEKKZ2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MCEKKZ>-AANFR = 1.
<MCEKKZ>-AANFP = 1.
<MCEKKZ>-AANGP = 1.
<MCEKKZ>-ABEST = 1.
<MCEKKZ>-ABSTP = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MCEKKZ-ABSTE, sy-vline,
  WA_MCEKKZ-AKONT, sy-vline,
  WA_MCEKKZ-AKONP, sy-vline,
  WA_MCEKKZ-ALFPL, sy-vline,
  WA_MCEKKZ-ALFPP, sy-vline,
  WA_MCEKKZ-ALFPE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MCEKKZ 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_MCEKKZ 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_MCEKKZ INTO WA_MCEKKZ.


*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_MCEKKZ_STR, 
AANFR TYPE STRING,
AANFP TYPE STRING,
AANGP TYPE STRING,
ABEST TYPE STRING,
ABSTP TYPE STRING,
ABSTE TYPE STRING,
AKONT TYPE STRING,
AKONP TYPE STRING,
ALFPL TYPE STRING,
ALFPP TYPE STRING,
ALFPE TYPE STRING,
EFFWR_R TYPE STRING,
EFFWR TYPE STRING,
NETWR_R TYPE STRING,
NETWR TYPE STRING,
BRTWR_R TYPE STRING,
BRTWR TYPE STRING,
REWRT_R TYPE STRING,
REWRT TYPE STRING,
LSMNG TYPE STRING,
MENGE_R TYPE STRING,
MENGE TYPE STRING,
WEMNG_R TYPE STRING,
WEMNG TYPE STRING,
WEMGM TYPE STRING,
REMNG_R TYPE STRING,
REMNG TYPE STRING,
LFZTG TYPE STRING,
TABW1 TYPE STRING,
TABW2 TYPE STRING,
TABW3 TYPE STRING,
TABW4 TYPE STRING,
TABW5 TYPE STRING,
MABW1 TYPE STRING,
MABW2 TYPE STRING,
MABW3 TYPE STRING,
MABW4 TYPE STRING,
MABW5 TYPE STRING,
PWMT1 TYPE STRING,
PWMT2 TYPE STRING,
PWTT1 TYPE STRING,
PWTT2 TYPE STRING,
PWEV1 TYPE STRING,
PWEV2 TYPE STRING,
PWWE1 TYPE STRING,
PWWE2 TYPE STRING,
PWFR1 TYPE STRING,
PWFR2 TYPE STRING,
PWQA1 TYPE STRING,
PWQA2 TYPE STRING,
LAVI1 TYPE STRING,
LAVI2 TYPE STRING,
ALAV1 TYPE STRING,
ALAV2 TYPE STRING,
WEWRT TYPE STRING,
WEWRT_B TYPE STRING,
REWRT_B TYPE STRING,
REMNG_B TYPE STRING,
WEWRT_R_B TYPE STRING,
REWRT_R_B TYPE STRING,
REMNG_R_B TYPE STRING,
DUMMY TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MCEKKZ_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_MCEKKZ_STR-AANFR sy-vline 
WA_MCEKKZ_STR-AANFP sy-vline 
WA_MCEKKZ_STR-AANGP sy-vline 
WA_MCEKKZ_STR-ABEST sy-vline 
WA_MCEKKZ_STR-ABSTP sy-vline 
WA_MCEKKZ_STR-ABSTE sy-vline 
WA_MCEKKZ_STR-AKONT sy-vline 
WA_MCEKKZ_STR-AKONP sy-vline 
WA_MCEKKZ_STR-ALFPL sy-vline 
WA_MCEKKZ_STR-ALFPP sy-vline 
WA_MCEKKZ_STR-ALFPE sy-vline 
WA_MCEKKZ_STR-EFFWR_R sy-vline 
WA_MCEKKZ_STR-EFFWR sy-vline 
WA_MCEKKZ_STR-NETWR_R sy-vline 
WA_MCEKKZ_STR-NETWR sy-vline 
WA_MCEKKZ_STR-BRTWR_R sy-vline 
WA_MCEKKZ_STR-BRTWR sy-vline 
WA_MCEKKZ_STR-REWRT_R sy-vline 
WA_MCEKKZ_STR-REWRT sy-vline 
WA_MCEKKZ_STR-LSMNG sy-vline 
WA_MCEKKZ_STR-MENGE_R sy-vline 
WA_MCEKKZ_STR-MENGE sy-vline 
WA_MCEKKZ_STR-WEMNG_R sy-vline 
WA_MCEKKZ_STR-WEMNG sy-vline 
WA_MCEKKZ_STR-WEMGM sy-vline 
WA_MCEKKZ_STR-REMNG_R sy-vline 
WA_MCEKKZ_STR-REMNG sy-vline 
WA_MCEKKZ_STR-LFZTG sy-vline 
WA_MCEKKZ_STR-TABW1 sy-vline 
WA_MCEKKZ_STR-TABW2 sy-vline 
WA_MCEKKZ_STR-TABW3 sy-vline 
WA_MCEKKZ_STR-TABW4 sy-vline 
WA_MCEKKZ_STR-TABW5 sy-vline 
WA_MCEKKZ_STR-MABW1 sy-vline 
WA_MCEKKZ_STR-MABW2 sy-vline 
WA_MCEKKZ_STR-MABW3 sy-vline 
WA_MCEKKZ_STR-MABW4 sy-vline 
WA_MCEKKZ_STR-MABW5 sy-vline 
WA_MCEKKZ_STR-PWMT1 sy-vline 
WA_MCEKKZ_STR-PWMT2 sy-vline 
WA_MCEKKZ_STR-PWTT1 sy-vline 
WA_MCEKKZ_STR-PWTT2 sy-vline 
WA_MCEKKZ_STR-PWEV1 sy-vline 
WA_MCEKKZ_STR-PWEV2 sy-vline 
WA_MCEKKZ_STR-PWWE1 sy-vline 
WA_MCEKKZ_STR-PWWE2 sy-vline 
WA_MCEKKZ_STR-PWFR1 sy-vline 
WA_MCEKKZ_STR-PWFR2 sy-vline 
WA_MCEKKZ_STR-PWQA1 sy-vline 
WA_MCEKKZ_STR-PWQA2 sy-vline 
WA_MCEKKZ_STR-LAVI1 sy-vline 
WA_MCEKKZ_STR-LAVI2 sy-vline 
WA_MCEKKZ_STR-ALAV1 sy-vline 
WA_MCEKKZ_STR-ALAV2 sy-vline 
WA_MCEKKZ_STR-WEWRT sy-vline 
WA_MCEKKZ_STR-WEWRT_B sy-vline 
WA_MCEKKZ_STR-REWRT_B sy-vline 
WA_MCEKKZ_STR-REMNG_B sy-vline 
WA_MCEKKZ_STR-WEWRT_R_B sy-vline 
WA_MCEKKZ_STR-REWRT_R_B sy-vline 
WA_MCEKKZ_STR-REMNG_R_B sy-vline 
WA_MCEKKZ_STR-DUMMY sy-vline      INTO ld_text SEPARATED BY SPACE.

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