ABAP Select data from SAP table RDB_NSUM_GEN into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RDB_NSUM_GEN 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_NSUM_GEN. 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_NSUM_GEN 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_NSUM_GEN TYPE STANDARD TABLE OF RDB_NSUM_GEN,
      WA_RDB_NSUM_GEN TYPE RDB_NSUM_GEN,
      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_NSUM_GEN> TYPE RDB_NSUM_GEN.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RDB_NSUM_GEN
*  INTO TABLE @DATA(IT_RDB_NSUM_GEN2).
*--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_NSUM_GEN INDEX 1 INTO DATA(WA_RDB_NSUM_GEN2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RDB_NSUM_GEN>-MANDT = 1.
<RDB_NSUM_GEN>-KEYDATE = 1.
<RDB_NSUM_GEN>-PHTYPE = 1.
<RDB_NSUM_GEN>-PHNAME = 1.
<RDB_NSUM_GEN>-PHNODE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RDB_NSUM_GEN-KEYFIGURE, sy-vline,
  WA_RDB_NSUM_GEN-SUMSTATE, sy-vline,
  WA_RDB_NSUM_GEN-VALUE, sy-vline,
  WA_RDB_NSUM_GEN-EVALPROC2, sy-vline,
  WA_RDB_NSUM_GEN-CRUSER, sy-vline,
  WA_RDB_NSUM_GEN-CRTSTP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RDB_NSUM_GEN 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_NSUM_GEN 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_NSUM_GEN INTO WA_RDB_NSUM_GEN.


*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_NSUM_GEN-KEYFIGURE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RDB_NSUM_GEN-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_NSUM_GEN_STR, 
MANDT TYPE STRING,
KEYDATE TYPE STRING,
PHTYPE TYPE STRING,
PHNAME TYPE STRING,
PHNODE TYPE STRING,
KEYFIGURE TYPE STRING,
SUMSTATE TYPE STRING,
VALUE TYPE STRING,
EVALPROC2 TYPE STRING,
CRUSER TYPE STRING,
CRTSTP TYPE STRING,
UPUSER TYPE STRING,
UPTSTP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RDB_NSUM_GEN_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_NSUM_GEN_STR-MANDT sy-vline 
WA_RDB_NSUM_GEN_STR-KEYDATE sy-vline 
WA_RDB_NSUM_GEN_STR-PHTYPE sy-vline 
WA_RDB_NSUM_GEN_STR-PHNAME sy-vline 
WA_RDB_NSUM_GEN_STR-PHNODE sy-vline 
WA_RDB_NSUM_GEN_STR-KEYFIGURE sy-vline 
WA_RDB_NSUM_GEN_STR-SUMSTATE sy-vline 
WA_RDB_NSUM_GEN_STR-VALUE sy-vline 
WA_RDB_NSUM_GEN_STR-EVALPROC2 sy-vline 
WA_RDB_NSUM_GEN_STR-CRUSER sy-vline 
WA_RDB_NSUM_GEN_STR-CRTSTP sy-vline 
WA_RDB_NSUM_GEN_STR-UPUSER sy-vline 
WA_RDB_NSUM_GEN_STR-UPTSTP sy-vline      INTO ld_text SEPARATED BY SPACE.

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