ABAP Select data from SAP table GHO_S_RPT_DOI_WC_VOL_RST into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM GHO_S_RPT_DOI_WC_VOL_RST
*  INTO TABLE @DATA(IT_GHO_S_RPT_DOI_WC_VOL_RST2).
*--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_GHO_S_RPT_DOI_WC_VOL_RST INDEX 1 INTO DATA(WA_GHO_S_RPT_DOI_WC_VOL_RST2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<GHO_S_RPT_DOI_WC_VOL_RST>-START_DATE = 1.
<GHO_S_RPT_DOI_WC_VOL_RST>-TPLNR = 1.
<GHO_S_RPT_DOI_WC_VOL_RST>-DESCRIPTION = 1.
<GHO_S_RPT_DOI_WC_VOL_RST>-PROD_NET_ID = 1.
<GHO_S_RPT_DOI_WC_VOL_RST>-MEDIUM = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_GHO_S_RPT_DOI_WC_VOL_RST-DOI_ID, sy-vline,
  WA_GHO_S_RPT_DOI_WC_VOL_RST-DOI_NAME, sy-vline,
  WA_GHO_S_RPT_DOI_WC_VOL_RST-COMPANY_CODE, sy-vline,
  WA_GHO_S_RPT_DOI_WC_VOL_RST-CONCESSION, sy-vline,
  WA_GHO_S_RPT_DOI_WC_VOL_RST-VOLUME, sy-vline,
  WA_GHO_S_RPT_DOI_WC_VOL_RST-VOL_UNIT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_GHO_S_RPT_DOI_WC_VOL_RST 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_GHO_S_RPT_DOI_WC_VOL_RST 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_GHO_S_RPT_DOI_WC_VOL_RST INTO WA_GHO_S_RPT_DOI_WC_VOL_RST.


*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 TPLNR, internal->external for field TPLNR
CALL FUNCTION 'CONVERSION_EXIT_TPLNR_OUTPUT'
  EXPORTING
    input =                      WA_GHO_S_RPT_DOI_WC_VOL_RST-TPLNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_GHO_S_RPT_DOI_WC_VOL_RST-TPLNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit TPLNR, internal->external for field PROD_NET_ID
CALL FUNCTION 'CONVERSION_EXIT_TPLNR_OUTPUT'
  EXPORTING
    input =                      WA_GHO_S_RPT_DOI_WC_VOL_RST-PROD_NET_ID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_GHO_S_RPT_DOI_WC_VOL_RST-PROD_NET_ID.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field VOL_UNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_GHO_S_RPT_DOI_WC_VOL_RST-VOL_UNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_GHO_S_RPT_DOI_WC_VOL_RST-VOL_UNIT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field GRAVITY_UOM
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_GHO_S_RPT_DOI_WC_VOL_RST-GRAVITY_UOM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_GHO_S_RPT_DOI_WC_VOL_RST-GRAVITY_UOM.
WRITE:/ 'New Value:', ld_input.

*Conversion exit TPLNR, internal->external for field ORIGIN_NODE_ID
CALL FUNCTION 'CONVERSION_EXIT_TPLNR_OUTPUT'
  EXPORTING
    input =                      WA_GHO_S_RPT_DOI_WC_VOL_RST-ORIGIN_NODE_ID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_GHO_S_RPT_DOI_WC_VOL_RST-ORIGIN_NODE_ID.
WRITE:/ 'New Value:', ld_input.

*Conversion exit TPLNR, internal->external for field DEST_NODE_ID
CALL FUNCTION 'CONVERSION_EXIT_TPLNR_OUTPUT'
  EXPORTING
    input =                      WA_GHO_S_RPT_DOI_WC_VOL_RST-DEST_NODE_ID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_GHO_S_RPT_DOI_WC_VOL_RST-DEST_NODE_ID.
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_GHO_S_RPT_DOI_WC_VOL_RST_STR, 
START_DATE TYPE STRING,
TPLNR TYPE STRING,
DESCRIPTION TYPE STRING,
PROD_NET_ID TYPE STRING,
MEDIUM TYPE STRING,
DOI_ID TYPE STRING,
DOI_NAME TYPE STRING,
COMPANY_CODE TYPE STRING,
CONCESSION TYPE STRING,
VOLUME TYPE STRING,
VOL_UNIT TYPE STRING,
GRAVITY TYPE STRING,
GRAVITY_UOM TYPE STRING,
ALLOC_RUN_ID TYPE STRING,
ORIGIN_NODE_ID TYPE STRING,
DEST_NODE_ID TYPE STRING,
QTY_TYPE TYPE STRING,
THEO_ACT_IND TYPE STRING,
QTY_CATEGORY TYPE STRING,
QTY_TYPE_DESCR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_GHO_S_RPT_DOI_WC_VOL_RST_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_GHO_S_RPT_DOI_WC_VOL_RST_STR-START_DATE sy-vline 
WA_GHO_S_RPT_DOI_WC_VOL_RST_STR-TPLNR sy-vline 
WA_GHO_S_RPT_DOI_WC_VOL_RST_STR-DESCRIPTION sy-vline 
WA_GHO_S_RPT_DOI_WC_VOL_RST_STR-PROD_NET_ID sy-vline 
WA_GHO_S_RPT_DOI_WC_VOL_RST_STR-MEDIUM sy-vline 
WA_GHO_S_RPT_DOI_WC_VOL_RST_STR-DOI_ID sy-vline 
WA_GHO_S_RPT_DOI_WC_VOL_RST_STR-DOI_NAME sy-vline 
WA_GHO_S_RPT_DOI_WC_VOL_RST_STR-COMPANY_CODE sy-vline 
WA_GHO_S_RPT_DOI_WC_VOL_RST_STR-CONCESSION sy-vline 
WA_GHO_S_RPT_DOI_WC_VOL_RST_STR-VOLUME sy-vline 
WA_GHO_S_RPT_DOI_WC_VOL_RST_STR-VOL_UNIT sy-vline 
WA_GHO_S_RPT_DOI_WC_VOL_RST_STR-GRAVITY sy-vline 
WA_GHO_S_RPT_DOI_WC_VOL_RST_STR-GRAVITY_UOM sy-vline 
WA_GHO_S_RPT_DOI_WC_VOL_RST_STR-ALLOC_RUN_ID sy-vline 
WA_GHO_S_RPT_DOI_WC_VOL_RST_STR-ORIGIN_NODE_ID sy-vline 
WA_GHO_S_RPT_DOI_WC_VOL_RST_STR-DEST_NODE_ID sy-vline 
WA_GHO_S_RPT_DOI_WC_VOL_RST_STR-QTY_TYPE sy-vline 
WA_GHO_S_RPT_DOI_WC_VOL_RST_STR-THEO_ACT_IND sy-vline 
WA_GHO_S_RPT_DOI_WC_VOL_RST_STR-QTY_CATEGORY sy-vline 
WA_GHO_S_RPT_DOI_WC_VOL_RST_STR-QTY_TYPE_DESCR sy-vline      INTO ld_text SEPARATED BY SPACE.

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