ABAP Select data from SAP table CMM_MTM_PO_K into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CMM_MTM_PO_K
*  INTO TABLE @DATA(IT_CMM_MTM_PO_K2).
*--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_CMM_MTM_PO_K INDEX 1 INTO DATA(WA_CMM_MTM_PO_K2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CMM_MTM_PO_K>-EBELN = 1.
<CMM_MTM_PO_K>-EBELP = 1.
<CMM_MTM_PO_K>-KAPPL = 1.
<CMM_MTM_PO_K>-KSCHL = 1.
<CMM_MTM_PO_K>-COMMODITY = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CMM_MTM_PO_K-VGABE, sy-vline,
  WA_CMM_MTM_PO_K-MBLNR, sy-vline,
  WA_CMM_MTM_PO_K-GJAHR, sy-vline,
  WA_CMM_MTM_PO_K-BUZEI, sy-vline,
  WA_CMM_MTM_PO_K-VERSION, sy-vline,
  WA_CMM_MTM_PO_K-EVAL_DATE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CMM_MTM_PO_K 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_CMM_MTM_PO_K 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_CMM_MTM_PO_K INTO WA_CMM_MTM_PO_K.


*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_CMM_MTM_PO_K-EBELN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CMM_MTM_PO_K-EBELN.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit GJAHR, internal->external for field GJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_CMM_MTM_PO_K-GJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CMM_MTM_PO_K-GJAHR.
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_CMM_MTM_PO_K_STR, 
EBELN TYPE STRING,
EBELP TYPE STRING,
KAPPL TYPE STRING,
KSCHL TYPE STRING,
COMMODITY TYPE STRING,
VGABE TYPE STRING,
MBLNR TYPE STRING,
GJAHR TYPE STRING,
BUZEI TYPE STRING,
VERSION TYPE STRING,
EVAL_DATE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CMM_MTM_PO_K_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_CMM_MTM_PO_K_STR-EBELN sy-vline 
WA_CMM_MTM_PO_K_STR-EBELP sy-vline 
WA_CMM_MTM_PO_K_STR-KAPPL sy-vline 
WA_CMM_MTM_PO_K_STR-KSCHL sy-vline 
WA_CMM_MTM_PO_K_STR-COMMODITY sy-vline 
WA_CMM_MTM_PO_K_STR-VGABE sy-vline 
WA_CMM_MTM_PO_K_STR-MBLNR sy-vline 
WA_CMM_MTM_PO_K_STR-GJAHR sy-vline 
WA_CMM_MTM_PO_K_STR-BUZEI sy-vline 
WA_CMM_MTM_PO_K_STR-VERSION sy-vline 
WA_CMM_MTM_PO_K_STR-EVAL_DATE sy-vline      INTO ld_text SEPARATED BY SPACE.

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