ABAP Select data from SAP table RNWAT_SR_AK_SERVICES into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNWAT_SR_AK_SERVICES
*  INTO TABLE @DATA(IT_RNWAT_SR_AK_SERVICES2).
*--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_RNWAT_SR_AK_SERVICES INDEX 1 INTO DATA(WA_RNWAT_SR_AK_SERVICES2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNWAT_SR_AK_SERVICES>-EINRI = 1.
<RNWAT_SR_AK_SERVICES>-LFDNR = 1.
<RNWAT_SR_AK_SERVICES>-LKAT = 1.
<RNWAT_SR_AK_SERVICES>-LEIST = 1.
<RNWAT_SR_AK_SERVICES>-ORGPF = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNWAT_SR_AK_SERVICES-ORGFA, sy-vline,
  WA_RNWAT_SR_AK_SERVICES-BEGDT, sy-vline,
  WA_RNWAT_SR_AK_SERVICES-BEGZT, sy-vline,
  WA_RNWAT_SR_AK_SERVICES-ENDDT, sy-vline,
  WA_RNWAT_SR_AK_SERVICES-ENDZT, sy-vline,
  WA_RNWAT_SR_AK_SERVICES-ABRKZ, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNWAT_SR_AK_SERVICES 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_RNWAT_SR_AK_SERVICES 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_RNWAT_SR_AK_SERVICES INTO WA_RNWAT_SR_AK_SERVICES.


*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_RNWAT_SR_AK_SERVICES-EINRI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNWAT_SR_AK_SERVICES-EINRI.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

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

*Conversion exit ALPHA, internal->external for field BFORM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNWAT_SR_AK_SERVICES-BFORM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNWAT_SR_AK_SERVICES-BFORM.
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_RNWAT_SR_AK_SERVICES_STR, 
EINRI TYPE STRING,
LFDNR TYPE STRING,
LKAT TYPE STRING,
LEIST TYPE STRING,
ORGPF TYPE STRING,
ORGFA TYPE STRING,
BEGDT TYPE STRING,
BEGZT TYPE STRING,
ENDDT TYPE STRING,
ENDZT TYPE STRING,
ABRKZ TYPE STRING,
ENTGA TYPE STRING,
BFORM TYPE STRING,
VTKZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNWAT_SR_AK_SERVICES_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_RNWAT_SR_AK_SERVICES_STR-EINRI sy-vline 
WA_RNWAT_SR_AK_SERVICES_STR-LFDNR sy-vline 
WA_RNWAT_SR_AK_SERVICES_STR-LKAT sy-vline 
WA_RNWAT_SR_AK_SERVICES_STR-LEIST sy-vline 
WA_RNWAT_SR_AK_SERVICES_STR-ORGPF sy-vline 
WA_RNWAT_SR_AK_SERVICES_STR-ORGFA sy-vline 
WA_RNWAT_SR_AK_SERVICES_STR-BEGDT sy-vline 
WA_RNWAT_SR_AK_SERVICES_STR-BEGZT sy-vline 
WA_RNWAT_SR_AK_SERVICES_STR-ENDDT sy-vline 
WA_RNWAT_SR_AK_SERVICES_STR-ENDZT sy-vline 
WA_RNWAT_SR_AK_SERVICES_STR-ABRKZ sy-vline 
WA_RNWAT_SR_AK_SERVICES_STR-ENTGA sy-vline 
WA_RNWAT_SR_AK_SERVICES_STR-BFORM sy-vline 
WA_RNWAT_SR_AK_SERVICES_STR-VTKZ sy-vline      INTO ld_text SEPARATED BY SPACE.

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