ABAP Select data from SAP table NETWORK_WPS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM NETWORK_WPS
*  INTO TABLE @DATA(IT_NETWORK_WPS2).
*--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_NETWORK_WPS INDEX 1 INTO DATA(WA_NETWORK_WPS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<NETWORK_WPS>-AUFNR = 1.
<NETWORK_WPS>-TIMEFRAME = 1.
<NETWORK_WPS>-STARTDATE = 1.
<NETWORK_WPS>-STARTTIME = 1.
<NETWORK_WPS>-ENDDATE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_NETWORK_WPS-ENDTIME, sy-vline,
  WA_NETWORK_WPS-NODEID, sy-vline,
  WA_NETWORK_WPS-CHANGED, sy-vline,
  WA_NETWORK_WPS-LOCATION, sy-vline,
  WA_NETWORK_WPS-REVNR, sy-vline,
  WA_NETWORK_WPS-IWERK, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_NETWORK_WPS 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_NETWORK_WPS 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_NETWORK_WPS INTO WA_NETWORK_WPS.


*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 AUFNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_NETWORK_WPS-AUFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_NETWORK_WPS-AUFNR.
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_NETWORK_WPS_STR, 
AUFNR TYPE STRING,
TIMEFRAME TYPE STRING,
STARTDATE TYPE STRING,
STARTTIME TYPE STRING,
ENDDATE TYPE STRING,
ENDTIME TYPE STRING,
NODEID TYPE STRING,
CHANGED TYPE STRING,
LOCATION TYPE STRING,
REVNR TYPE STRING,
IWERK TYPE STRING,
CHANGED_REVNR TYPE STRING,
CHANGED_IWERK TYPE STRING,END OF T_EKKO_STR.
DATA: WA_NETWORK_WPS_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_NETWORK_WPS_STR-AUFNR sy-vline 
WA_NETWORK_WPS_STR-TIMEFRAME sy-vline 
WA_NETWORK_WPS_STR-STARTDATE sy-vline 
WA_NETWORK_WPS_STR-STARTTIME sy-vline 
WA_NETWORK_WPS_STR-ENDDATE sy-vline 
WA_NETWORK_WPS_STR-ENDTIME sy-vline 
WA_NETWORK_WPS_STR-NODEID sy-vline 
WA_NETWORK_WPS_STR-CHANGED sy-vline 
WA_NETWORK_WPS_STR-LOCATION sy-vline 
WA_NETWORK_WPS_STR-REVNR sy-vline 
WA_NETWORK_WPS_STR-IWERK sy-vline 
WA_NETWORK_WPS_STR-CHANGED_REVNR sy-vline 
WA_NETWORK_WPS_STR-CHANGED_IWERK sy-vline      INTO ld_text SEPARATED BY SPACE.

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