ABAP Select data from SAP table CM61G into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP CM61G 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 CM61G. 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 CM61G 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_CM61G TYPE STANDARD TABLE OF CM61G,
      WA_CM61G TYPE CM61G,
      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: <CM61G> TYPE CM61G.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_CM61G.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM CM61G
  INTO TABLE IT_CM61G.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CM61G
*  INTO TABLE @DATA(IT_CM61G2).
*--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_CM61G INDEX 1 INTO DATA(WA_CM61G2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_CM61G ASSIGNING <CM61G>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CM61G>-TITEL = 1.
<CM61G>-UTITL = 1.
<CM61G>-GSTAT = 1.
<CM61G>-PERKZ = 1.
<CM61G>-PERIV = 1.

ENDLOOP.

LOOP AT IT_CM61G INTO WA_CM61G.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CM61G-FABKL, sy-vline,
  WA_CM61G-BLANP, sy-vline,
  WA_CM61G-REFDT, sy-vline,
  WA_CM61G-MEINS, sy-vline,
  WA_CM61G-YDECI, sy-vline,
  WA_CM61G-CURVE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CM61G 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_CM61G 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_CM61G INTO WA_CM61G.


*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 CUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_CM61G-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CM61G-MEINS.
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_CM61G_STR, 
TITEL TYPE STRING,
UTITL TYPE STRING,
GSTAT TYPE STRING,
PERKZ TYPE STRING,
PERIV TYPE STRING,
FABKL TYPE STRING,
BLANP TYPE STRING,
REFDT TYPE STRING,
MEINS TYPE STRING,
YDECI TYPE STRING,
CURVE TYPE STRING,
INDEX TYPE STRING,
WINID TYPE STRING,
M_TYP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CM61G_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_CM61G_STR-TITEL sy-vline 
WA_CM61G_STR-UTITL sy-vline 
WA_CM61G_STR-GSTAT sy-vline 
WA_CM61G_STR-PERKZ sy-vline 
WA_CM61G_STR-PERIV sy-vline 
WA_CM61G_STR-FABKL sy-vline 
WA_CM61G_STR-BLANP sy-vline 
WA_CM61G_STR-REFDT sy-vline 
WA_CM61G_STR-MEINS sy-vline 
WA_CM61G_STR-YDECI sy-vline 
WA_CM61G_STR-CURVE sy-vline 
WA_CM61G_STR-INDEX sy-vline 
WA_CM61G_STR-WINID sy-vline 
WA_CM61G_STR-M_TYP sy-vline      INTO ld_text SEPARATED BY SPACE.

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