ABAP Select data from SAP table MCEKS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MCEKS
*  INTO TABLE @DATA(IT_MCEKS2).
*--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_MCEKS INDEX 1 INTO DATA(WA_MCEKS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MCEKS>-MANDT = 1.
<MCEKS>-SSOUR = 1.
<MCEKS>-BUKRS = 1.
<MCEKS>-EBELN = 1.
<MCEKS>-EBELP = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MCEKS-EINDT, sy-vline,
  WA_MCEKS-ETENR, sy-vline,
  WA_MCEKS-BUPER, sy-vline,
  WA_MCEKS-EKGRP, sy-vline,
  WA_MCEKS-LIFNR, sy-vline,
  WA_MCEKS-MATKL, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MCEKS 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_MCEKS 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_MCEKS INTO WA_MCEKS.


*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 ALPHA, internal->external for field EBELN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MCEKS-EBELN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCEKS-EBELN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LIFNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MCEKS-LIFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCEKS-LIFNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_MCEKS-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCEKS-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MCEKS-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCEKS-MEINS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit EXCRT, internal->external for field UMREF
CALL FUNCTION 'CONVERSION_EXIT_EXCRT_OUTPUT'
  EXPORTING
    input =                      WA_MCEKS-UMREF
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCEKS-UMREF.
WRITE:/ 'New Value:', ld_input.

*Conversion exit EXCRT, internal->external for field WKURS
CALL FUNCTION 'CONVERSION_EXIT_EXCRT_OUTPUT'
  EXPORTING
    input =                      WA_MCEKS-WKURS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCEKS-WKURS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field LMEIN
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MCEKS-LMEIN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCEKS-LMEIN.
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_MCEKS_STR, 
MANDT TYPE STRING,
SSOUR TYPE STRING,
BUKRS TYPE STRING,
EBELN TYPE STRING,
EBELP TYPE STRING,
EINDT TYPE STRING,
ETENR TYPE STRING,
BUPER TYPE STRING,
EKGRP TYPE STRING,
LIFNR TYPE STRING,
MATKL TYPE STRING,
MULKZ TYPE STRING,
MATNR TYPE STRING,
WERKS TYPE STRING,
BSTYP TYPE STRING,
LOEKZ TYPE STRING,
MENGE TYPE STRING,
MEINS TYPE STRING,
UMREF TYPE STRING,
BRTWR TYPE STRING,
NETWR TYPE STRING,
WAERS TYPE STRING,
WKURS TYPE STRING,
FFACT TYPE STRING,
REMNG TYPE STRING,
REWRT TYPE STRING,
WEMNG TYPE STRING,
BEDAT TYPE STRING,
BSART TYPE STRING,
DLIFZ TYPE STRING,
ALIEF TYPE STRING,
WEABW TYPE STRING,
MAHNZ TYPE STRING,
SLFDT TYPE STRING,
LMEIN TYPE STRING,
LAND1 TYPE STRING,
HWAER TYPE STRING,
EKORG TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MCEKS_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_MCEKS_STR-MANDT sy-vline 
WA_MCEKS_STR-SSOUR sy-vline 
WA_MCEKS_STR-BUKRS sy-vline 
WA_MCEKS_STR-EBELN sy-vline 
WA_MCEKS_STR-EBELP sy-vline 
WA_MCEKS_STR-EINDT sy-vline 
WA_MCEKS_STR-ETENR sy-vline 
WA_MCEKS_STR-BUPER sy-vline 
WA_MCEKS_STR-EKGRP sy-vline 
WA_MCEKS_STR-LIFNR sy-vline 
WA_MCEKS_STR-MATKL sy-vline 
WA_MCEKS_STR-MULKZ sy-vline 
WA_MCEKS_STR-MATNR sy-vline 
WA_MCEKS_STR-WERKS sy-vline 
WA_MCEKS_STR-BSTYP sy-vline 
WA_MCEKS_STR-LOEKZ sy-vline 
WA_MCEKS_STR-MENGE sy-vline 
WA_MCEKS_STR-MEINS sy-vline 
WA_MCEKS_STR-UMREF sy-vline 
WA_MCEKS_STR-BRTWR sy-vline 
WA_MCEKS_STR-NETWR sy-vline 
WA_MCEKS_STR-WAERS sy-vline 
WA_MCEKS_STR-WKURS sy-vline 
WA_MCEKS_STR-FFACT sy-vline 
WA_MCEKS_STR-REMNG sy-vline 
WA_MCEKS_STR-REWRT sy-vline 
WA_MCEKS_STR-WEMNG sy-vline 
WA_MCEKS_STR-BEDAT sy-vline 
WA_MCEKS_STR-BSART sy-vline 
WA_MCEKS_STR-DLIFZ sy-vline 
WA_MCEKS_STR-ALIEF sy-vline 
WA_MCEKS_STR-WEABW sy-vline 
WA_MCEKS_STR-MAHNZ sy-vline 
WA_MCEKS_STR-SLFDT sy-vline 
WA_MCEKS_STR-LMEIN sy-vline 
WA_MCEKS_STR-LAND1 sy-vline 
WA_MCEKS_STR-HWAER sy-vline 
WA_MCEKS_STR-EKORG sy-vline      INTO ld_text SEPARATED BY SPACE.

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