ABAP Select data from SAP table RDB_READ_NSUM_ALL_MM into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RDB_READ_NSUM_ALL_MM
*  INTO TABLE @DATA(IT_RDB_READ_NSUM_ALL_MM2).
*--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_RDB_READ_NSUM_ALL_MM INDEX 1 INTO DATA(WA_RDB_READ_NSUM_ALL_MM2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RDB_READ_NSUM_ALL_MM>-KEYDATE = 1.
<RDB_READ_NSUM_ALL_MM>-PHNODE = 1.
<RDB_READ_NSUM_ALL_MM>-KEYFIGURE = 1.
<RDB_READ_NSUM_ALL_MM>-CURRENCY = 1.
<RDB_READ_NSUM_ALL_MM>-SUMSTATE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RDB_READ_NSUM_ALL_MM-FLOWTYPE, sy-vline,
  WA_RDB_READ_NSUM_ALL_MM-EXPDATE, sy-vline,
  WA_RDB_READ_NSUM_ALL_MM-RKNOTEN, sy-vline,
  WA_RDB_READ_NSUM_ALL_MM-SIMIDX, sy-vline,
  WA_RDB_READ_NSUM_ALL_MM-DATEFROM, sy-vline,
  WA_RDB_READ_NSUM_ALL_MM-DATETO, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RDB_READ_NSUM_ALL_MM 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_RDB_READ_NSUM_ALL_MM 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_RDB_READ_NSUM_ALL_MM INTO WA_RDB_READ_NSUM_ALL_MM.


*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 ALFAN, internal->external for field KEYFIGURE
CALL FUNCTION 'CONVERSION_EXIT_ALFAN_OUTPUT'
  EXPORTING
    input =                      WA_RDB_READ_NSUM_ALL_MM-KEYFIGURE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RDB_READ_NSUM_ALL_MM-KEYFIGURE.
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_RDB_READ_NSUM_ALL_MM_STR, 
KEYDATE TYPE STRING,
PHNODE TYPE STRING,
KEYFIGURE TYPE STRING,
CURRENCY TYPE STRING,
SUMSTATE TYPE STRING,
FLOWTYPE TYPE STRING,
EXPDATE TYPE STRING,
RKNOTEN TYPE STRING,
SIMIDX TYPE STRING,
DATEFROM TYPE STRING,
DATETO TYPE STRING,
CORRECTION_REC TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RDB_READ_NSUM_ALL_MM_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_RDB_READ_NSUM_ALL_MM_STR-KEYDATE sy-vline 
WA_RDB_READ_NSUM_ALL_MM_STR-PHNODE sy-vline 
WA_RDB_READ_NSUM_ALL_MM_STR-KEYFIGURE sy-vline 
WA_RDB_READ_NSUM_ALL_MM_STR-CURRENCY sy-vline 
WA_RDB_READ_NSUM_ALL_MM_STR-SUMSTATE sy-vline 
WA_RDB_READ_NSUM_ALL_MM_STR-FLOWTYPE sy-vline 
WA_RDB_READ_NSUM_ALL_MM_STR-EXPDATE sy-vline 
WA_RDB_READ_NSUM_ALL_MM_STR-RKNOTEN sy-vline 
WA_RDB_READ_NSUM_ALL_MM_STR-SIMIDX sy-vline 
WA_RDB_READ_NSUM_ALL_MM_STR-DATEFROM sy-vline 
WA_RDB_READ_NSUM_ALL_MM_STR-DATETO sy-vline 
WA_RDB_READ_NSUM_ALL_MM_STR-CORRECTION_REC sy-vline      INTO ld_text SEPARATED BY SPACE.

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