ABAP Select data from SAP table GHO_S_GEF_SRV_NW 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_GEF_SRV_NW 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_GEF_SRV_NW. 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_GEF_SRV_NW 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_GEF_SRV_NW TYPE STANDARD TABLE OF GHO_S_GEF_SRV_NW,
      WA_GHO_S_GEF_SRV_NW TYPE GHO_S_GEF_SRV_NW,
      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_GEF_SRV_NW> TYPE GHO_S_GEF_SRV_NW.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM GHO_S_GEF_SRV_NW
*  INTO TABLE @DATA(IT_GHO_S_GEF_SRV_NW2).
*--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_GEF_SRV_NW INDEX 1 INTO DATA(WA_GHO_S_GEF_SRV_NW2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<GHO_S_GEF_SRV_NW>-NETWORKOBJECTID = 1.
<GHO_S_GEF_SRV_NW>-NETWORKINTERNALID = 1.
<GHO_S_GEF_SRV_NW>-NETWORKOBJECTTYPE = 1.
<GHO_S_GEF_SRV_NW>-NETWORKOBJECTTYPEDESCRIPTION = 1.
<GHO_S_GEF_SRV_NW>-FUNCTIONALLOCATIONDESCRIPTION = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_GHO_S_GEF_SRV_NW-PRODUCTIONNETWORKID, sy-vline,
  WA_GHO_S_GEF_SRV_NW-NTWKOBJISINOPERATION, sy-vline,
  WA_GHO_S_GEF_SRV_NW-NTWKOBJLIFECYCLESTATUS, sy-vline,
  WA_GHO_S_GEF_SRV_NW-DATAINTEGRATIONSYSTEMID, sy-vline,
  WA_GHO_S_GEF_SRV_NW-FREQUENCY, sy-vline,
  WA_GHO_S_GEF_SRV_NW-PRODUCTIONDATE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_GHO_S_GEF_SRV_NW 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_GEF_SRV_NW 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_GEF_SRV_NW INTO WA_GHO_S_GEF_SRV_NW.


*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 NETWORKOBJECTID
CALL FUNCTION 'CONVERSION_EXIT_TPLNR_OUTPUT'
  EXPORTING
    input =                      WA_GHO_S_GEF_SRV_NW-NETWORKOBJECTID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_GHO_S_GEF_SRV_NW-NETWORKOBJECTID.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit TPLNR, internal->external for field PRODUCTIONNETWORKID_INTERNAL
CALL FUNCTION 'CONVERSION_EXIT_TPLNR_OUTPUT'
  EXPORTING
    input =                      WA_GHO_S_GEF_SRV_NW-PRODUCTIONNETWORKID_INTERNAL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_GHO_S_GEF_SRV_NW-PRODUCTIONNETWORKID_INTERNAL.
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_GEF_SRV_NW_STR, 
NETWORKOBJECTID TYPE STRING,
NETWORKINTERNALID TYPE STRING,
NETWORKOBJECTTYPE TYPE STRING,
NETWORKOBJECTTYPEDESCRIPTION TYPE STRING,
FUNCTIONALLOCATIONDESCRIPTION TYPE STRING,
PRODUCTIONNETWORKID TYPE STRING,
NTWKOBJISINOPERATION TYPE STRING,
NTWKOBJLIFECYCLESTATUS TYPE STRING,
DATAINTEGRATIONSYSTEMID TYPE STRING,
FREQUENCY TYPE STRING,
PRODUCTIONDATE TYPE STRING,
PRODUCTIONNETWORKID_INTERNAL TYPE STRING,
QUANTITYTYPE TYPE STRING,
GEOMETRY TYPE STRING,
PHYSICAL_STATUS_DESCRIPTION TYPE STRING,END OF T_EKKO_STR.
DATA: WA_GHO_S_GEF_SRV_NW_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_GEF_SRV_NW_STR-NETWORKOBJECTID sy-vline 
WA_GHO_S_GEF_SRV_NW_STR-NETWORKINTERNALID sy-vline 
WA_GHO_S_GEF_SRV_NW_STR-NETWORKOBJECTTYPE sy-vline 
WA_GHO_S_GEF_SRV_NW_STR-NETWORKOBJECTTYPEDESCRIPTION sy-vline 
WA_GHO_S_GEF_SRV_NW_STR-FUNCTIONALLOCATIONDESCRIPTION sy-vline 
WA_GHO_S_GEF_SRV_NW_STR-PRODUCTIONNETWORKID sy-vline 
WA_GHO_S_GEF_SRV_NW_STR-NTWKOBJISINOPERATION sy-vline 
WA_GHO_S_GEF_SRV_NW_STR-NTWKOBJLIFECYCLESTATUS sy-vline 
WA_GHO_S_GEF_SRV_NW_STR-DATAINTEGRATIONSYSTEMID sy-vline 
WA_GHO_S_GEF_SRV_NW_STR-FREQUENCY sy-vline 
WA_GHO_S_GEF_SRV_NW_STR-PRODUCTIONDATE sy-vline 
WA_GHO_S_GEF_SRV_NW_STR-PRODUCTIONNETWORKID_INTERNAL sy-vline 
WA_GHO_S_GEF_SRV_NW_STR-QUANTITYTYPE sy-vline 
WA_GHO_S_GEF_SRV_NW_STR-GEOMETRY sy-vline 
WA_GHO_S_GEF_SRV_NW_STR-PHYSICAL_STATUS_DESCRIPTION sy-vline      INTO ld_text SEPARATED BY SPACE.

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