ABAP Select data from SAP table RNWATTRISSX into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RNWATTRISSX 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 RNWATTRISSX. 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 RNWATTRISSX 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_RNWATTRISSX TYPE STANDARD TABLE OF RNWATTRISSX,
      WA_RNWATTRISSX TYPE RNWATTRISSX,
      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: <RNWATTRISSX> TYPE RNWATTRISSX.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNWATTRISSX
*  INTO TABLE @DATA(IT_RNWATTRISSX2).
*--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_RNWATTRISSX INDEX 1 INTO DATA(WA_RNWATTRISSX2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNWATTRISSX>-MANDT = 1.
<RNWATTRISSX>-EINRI = 1.
<RNWATTRISSX>-FALNR = 1.
<RNWATTRISSX>-LFDNR = 1.
<RNWATTRISSX>-INTNR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNWATTRISSX-ACTINTNR, sy-vline,
  WA_RNWATTRISSX-ABDOMEN, sy-vline,
  WA_RNWATTRISSX-ABDOMEN_X, sy-vline,
  WA_RNWATTRISSX-EXTERN, sy-vline,
  WA_RNWATTRISSX-EXTERN_X, sy-vline,
  WA_RNWATTRISSX-EXTREMIT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNWATTRISSX 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_RNWATTRISSX 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_RNWATTRISSX INTO WA_RNWATTRISSX.


*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 EINRI
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNWATTRISSX-EINRI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNWATTRISSX-EINRI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field FALNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNWATTRISSX-FALNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNWATTRISSX-FALNR.
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_RNWATTRISSX_STR, 
MANDT TYPE STRING,
EINRI TYPE STRING,
FALNR TYPE STRING,
LFDNR TYPE STRING,
INTNR TYPE STRING,
ACTINTNR TYPE STRING,
ABDOMEN TYPE STRING,
ABDOMEN_X TYPE STRING,
EXTERN TYPE STRING,
EXTERN_X TYPE STRING,
EXTREMIT TYPE STRING,
EXTREMIT_X TYPE STRING,
GESICHT TYPE STRING,
GESICHT_X TYPE STRING,
HALSKOPF TYPE STRING,
HALSKOPF_X TYPE STRING,
THORAX TYPE STRING,
THORAX_X TYPE STRING,
TYP TYPE STRING,
TYP_X TYPE STRING,
MOTOREAK TYPE STRING,
MOTOREAK_X TYPE STRING,
VERBALE TYPE STRING,
VERBALE_X TYPE STRING,
VISUELLE TYPE STRING,
VISUELLE_X TYPE STRING,
SYSTOL TYPE STRING,
SYSTOL_X TYPE STRING,
SYSTOL_I TYPE STRING,
SYSTOL_I_X TYPE STRING,
ATEMFRE TYPE STRING,
ATEMFRE_X TYPE STRING,
ERDAT TYPE STRING,
ERDAT_X TYPE STRING,
ERTIM TYPE STRING,
ERTIM_X TYPE STRING,
ERUSR TYPE STRING,
ERUSR_X TYPE STRING,
UPDAT TYPE STRING,
UPDAT_X TYPE STRING,
UPTIM TYPE STRING,
UPTIM_X TYPE STRING,
UPUSR TYPE STRING,
UPUSR_X TYPE STRING,
STORN TYPE STRING,
STORN_X TYPE STRING,
STDAT TYPE STRING,
STDAT_X TYPE STRING,
STUSR TYPE STRING,
STUSR_X TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNWATTRISSX_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_RNWATTRISSX_STR-MANDT sy-vline 
WA_RNWATTRISSX_STR-EINRI sy-vline 
WA_RNWATTRISSX_STR-FALNR sy-vline 
WA_RNWATTRISSX_STR-LFDNR sy-vline 
WA_RNWATTRISSX_STR-INTNR sy-vline 
WA_RNWATTRISSX_STR-ACTINTNR sy-vline 
WA_RNWATTRISSX_STR-ABDOMEN sy-vline 
WA_RNWATTRISSX_STR-ABDOMEN_X sy-vline 
WA_RNWATTRISSX_STR-EXTERN sy-vline 
WA_RNWATTRISSX_STR-EXTERN_X sy-vline 
WA_RNWATTRISSX_STR-EXTREMIT sy-vline 
WA_RNWATTRISSX_STR-EXTREMIT_X sy-vline 
WA_RNWATTRISSX_STR-GESICHT sy-vline 
WA_RNWATTRISSX_STR-GESICHT_X sy-vline 
WA_RNWATTRISSX_STR-HALSKOPF sy-vline 
WA_RNWATTRISSX_STR-HALSKOPF_X sy-vline 
WA_RNWATTRISSX_STR-THORAX sy-vline 
WA_RNWATTRISSX_STR-THORAX_X sy-vline 
WA_RNWATTRISSX_STR-TYP sy-vline 
WA_RNWATTRISSX_STR-TYP_X sy-vline 
WA_RNWATTRISSX_STR-MOTOREAK sy-vline 
WA_RNWATTRISSX_STR-MOTOREAK_X sy-vline 
WA_RNWATTRISSX_STR-VERBALE sy-vline 
WA_RNWATTRISSX_STR-VERBALE_X sy-vline 
WA_RNWATTRISSX_STR-VISUELLE sy-vline 
WA_RNWATTRISSX_STR-VISUELLE_X sy-vline 
WA_RNWATTRISSX_STR-SYSTOL sy-vline 
WA_RNWATTRISSX_STR-SYSTOL_X sy-vline 
WA_RNWATTRISSX_STR-SYSTOL_I sy-vline 
WA_RNWATTRISSX_STR-SYSTOL_I_X sy-vline 
WA_RNWATTRISSX_STR-ATEMFRE sy-vline 
WA_RNWATTRISSX_STR-ATEMFRE_X sy-vline 
WA_RNWATTRISSX_STR-ERDAT sy-vline 
WA_RNWATTRISSX_STR-ERDAT_X sy-vline 
WA_RNWATTRISSX_STR-ERTIM sy-vline 
WA_RNWATTRISSX_STR-ERTIM_X sy-vline 
WA_RNWATTRISSX_STR-ERUSR sy-vline 
WA_RNWATTRISSX_STR-ERUSR_X sy-vline 
WA_RNWATTRISSX_STR-UPDAT sy-vline 
WA_RNWATTRISSX_STR-UPDAT_X sy-vline 
WA_RNWATTRISSX_STR-UPTIM sy-vline 
WA_RNWATTRISSX_STR-UPTIM_X sy-vline 
WA_RNWATTRISSX_STR-UPUSR sy-vline 
WA_RNWATTRISSX_STR-UPUSR_X sy-vline 
WA_RNWATTRISSX_STR-STORN sy-vline 
WA_RNWATTRISSX_STR-STORN_X sy-vline 
WA_RNWATTRISSX_STR-STDAT sy-vline 
WA_RNWATTRISSX_STR-STDAT_X sy-vline 
WA_RNWATTRISSX_STR-STUSR sy-vline 
WA_RNWATTRISSX_STR-STUSR_X sy-vline      INTO ld_text SEPARATED BY SPACE.

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