ABAP Select data from SAP table CNMMEKES into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CNMMEKES
*  INTO TABLE @DATA(IT_CNMMEKES2).
*--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_CNMMEKES INDEX 1 INTO DATA(WA_CNMMEKES2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CNMMEKES>-RSNUM = 1.
<CNMMEKES>-RSPOS = 1.
<CNMMEKES>-RSART = 1.
<CNMMEKES>-ICONS = 1.
<CNMMEKES>-MATNR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CNMMEKES-MAKTX, sy-vline,
  WA_CNMMEKES-BDMNG, sy-vline,
  WA_CNMMEKES-MEINS, sy-vline,
  WA_CNMMEKES-BDTER, sy-vline,
  WA_CNMMEKES-KWBDTER, sy-vline,
  WA_CNMMEKES-EBELN, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CNMMEKES 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_CNMMEKES 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_CNMMEKES INTO WA_CNMMEKES.


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

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

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

*Conversion exit CUNIT, internal->external for field MEINS_EKES
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_CNMMEKES-MEINS_EKES
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CNMMEKES-MEINS_EKES.
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_CNMMEKES_STR, 
RSNUM TYPE STRING,
RSPOS TYPE STRING,
RSART TYPE STRING,
ICONS TYPE STRING,
MATNR TYPE STRING,
MAKTX TYPE STRING,
BDMNG TYPE STRING,
MEINS TYPE STRING,
BDTER TYPE STRING,
KWBDTER TYPE STRING,
EBELN TYPE STRING,
EBELP TYPE STRING,
XEKET TYPE STRING,
XEKES TYPE STRING,
XEKBE TYPE STRING,
EBTYP TYPE STRING,
EINDT TYPE STRING,
KWEINDT TYPE STRING,
ERDAT TYPE STRING,
KWERDAT TYPE STRING,
MENGE TYPE STRING,
MEINS_EKES TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CNMMEKES_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_CNMMEKES_STR-RSNUM sy-vline 
WA_CNMMEKES_STR-RSPOS sy-vline 
WA_CNMMEKES_STR-RSART sy-vline 
WA_CNMMEKES_STR-ICONS sy-vline 
WA_CNMMEKES_STR-MATNR sy-vline 
WA_CNMMEKES_STR-MAKTX sy-vline 
WA_CNMMEKES_STR-BDMNG sy-vline 
WA_CNMMEKES_STR-MEINS sy-vline 
WA_CNMMEKES_STR-BDTER sy-vline 
WA_CNMMEKES_STR-KWBDTER sy-vline 
WA_CNMMEKES_STR-EBELN sy-vline 
WA_CNMMEKES_STR-EBELP sy-vline 
WA_CNMMEKES_STR-XEKET sy-vline 
WA_CNMMEKES_STR-XEKES sy-vline 
WA_CNMMEKES_STR-XEKBE sy-vline 
WA_CNMMEKES_STR-EBTYP sy-vline 
WA_CNMMEKES_STR-EINDT sy-vline 
WA_CNMMEKES_STR-KWEINDT sy-vline 
WA_CNMMEKES_STR-ERDAT sy-vline 
WA_CNMMEKES_STR-KWERDAT sy-vline 
WA_CNMMEKES_STR-MENGE sy-vline 
WA_CNMMEKES_STR-MEINS_EKES sy-vline      INTO ld_text SEPARATED BY SPACE.

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