ABAP Select data from SAP table NETWORK_ACTIVITY_NODE_REL_ST into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP NETWORK_ACTIVITY_NODE_REL_ST 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_ACTIVITY_NODE_REL_ST. 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_ACTIVITY_NODE_REL_ST 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_ACTIVITY_NODE_REL_ST TYPE STANDARD TABLE OF NETWORK_ACTIVITY_NODE_REL_ST,
      WA_NETWORK_ACTIVITY_NODE_REL_ST TYPE NETWORK_ACTIVITY_NODE_REL_ST,
      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_ACTIVITY_NODE_REL_ST> TYPE NETWORK_ACTIVITY_NODE_REL_ST.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM NETWORK_ACTIVITY_NODE_REL_ST
*  INTO TABLE @DATA(IT_NETWORK_ACTIVITY_NODE_REL_ST2).
*--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_ACTIVITY_NODE_REL_ST INDEX 1 INTO DATA(WA_NETWORK_ACTIVITY_NODE_REL_ST2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<NETWORK_ACTIVITY_NODE_REL_ST>-MANDT = 1.
<NETWORK_ACTIVITY_NODE_REL_ST>-PROJECTNETWORKINTERNALID = 1.
<NETWORK_ACTIVITY_NODE_REL_ST>-NETWORKACTIVITYINTERNALID = 1.
<NETWORK_ACTIVITY_NODE_REL_ST>-PROJECTNETWORK = 1.
<NETWORK_ACTIVITY_NODE_REL_ST>-MAINTUSERSTATUSPROFILECODE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_NETWORK_ACTIVITY_NODE_REL_ST-NETWORKACTIVITY, sy-vline,
  WA_NETWORK_ACTIVITY_NODE_REL_ST-NETWORKACTIVITYDESCRIPTION, sy-vline,
  WA_NETWORK_ACTIVITY_NODE_REL_ST-SUPERIORNTWKACTIVITYINTERNALID, sy-vline,
  WA_NETWORK_ACTIVITY_NODE_REL_ST-NETWORKACTIVITYOBJECT, sy-vline,
  WA_NETWORK_ACTIVITY_NODE_REL_ST-WBSELEMENTINTERNALID, sy-vline,
  WA_NETWORK_ACTIVITY_NODE_REL_ST-WBSELEMENTEXTERNALID, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_NETWORK_ACTIVITY_NODE_REL_ST 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_ACTIVITY_NODE_REL_ST 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_ACTIVITY_NODE_REL_ST INTO WA_NETWORK_ACTIVITY_NODE_REL_ST.


*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 PROJECTNETWORK
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_NETWORK_ACTIVITY_NODE_REL_ST-PROJECTNETWORK
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_NETWORK_ACTIVITY_NODE_REL_ST-PROJECTNETWORK.
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_ACTIVITY_NODE_REL_ST_STR, 
MANDT TYPE STRING,
PROJECTNETWORKINTERNALID TYPE STRING,
NETWORKACTIVITYINTERNALID TYPE STRING,
PROJECTNETWORK TYPE STRING,
MAINTUSERSTATUSPROFILECODE TYPE STRING,
NETWORKACTIVITY TYPE STRING,
NETWORKACTIVITYDESCRIPTION TYPE STRING,
SUPERIORNTWKACTIVITYINTERNALID TYPE STRING,
NETWORKACTIVITYOBJECT TYPE STRING,
WBSELEMENTINTERNALID TYPE STRING,
WBSELEMENTEXTERNALID TYPE STRING,
PROJECTEXTERNALID TYPE STRING,
PROJECTINTERNALID TYPE STRING,
OBJECTISCONFIRMED TYPE STRING,
OBJECTISPARTIALLYCONFIRMED TYPE STRING,
TOTALFLOATFORBASICDATES TYPE STRING,
TOTALFLOATFORFORECASTEDDATES TYPE STRING,
PRODAVAILYCHECKPLANNINGTYPE TYPE STRING,
PLANT TYPE STRING,
WORKCENTERINTERNALID TYPE STRING,
WORKCENTER TYPE STRING,
HAS_SUCCESSOR TYPE STRING,
HAS_PREDECESSOR TYPE STRING,
IS_CRITICAL_BASIC TYPE STRING,
IS_CRITICAL_FORECAST TYPE STRING,END OF T_EKKO_STR.
DATA: WA_NETWORK_ACTIVITY_NODE_REL_ST_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_ACTIVITY_NODE_REL_ST_STR-MANDT sy-vline 
WA_NETWORK_ACTIVITY_NODE_REL_ST_STR-PROJECTNETWORKINTERNALID sy-vline 
WA_NETWORK_ACTIVITY_NODE_REL_ST_STR-NETWORKACTIVITYINTERNALID sy-vline 
WA_NETWORK_ACTIVITY_NODE_REL_ST_STR-PROJECTNETWORK sy-vline 
WA_NETWORK_ACTIVITY_NODE_REL_ST_STR-MAINTUSERSTATUSPROFILECODE sy-vline 
WA_NETWORK_ACTIVITY_NODE_REL_ST_STR-NETWORKACTIVITY sy-vline 
WA_NETWORK_ACTIVITY_NODE_REL_ST_STR-NETWORKACTIVITYDESCRIPTION sy-vline 
WA_NETWORK_ACTIVITY_NODE_REL_ST_STR-SUPERIORNTWKACTIVITYINTERNALID sy-vline 
WA_NETWORK_ACTIVITY_NODE_REL_ST_STR-NETWORKACTIVITYOBJECT sy-vline 
WA_NETWORK_ACTIVITY_NODE_REL_ST_STR-WBSELEMENTINTERNALID sy-vline 
WA_NETWORK_ACTIVITY_NODE_REL_ST_STR-WBSELEMENTEXTERNALID sy-vline 
WA_NETWORK_ACTIVITY_NODE_REL_ST_STR-PROJECTEXTERNALID sy-vline 
WA_NETWORK_ACTIVITY_NODE_REL_ST_STR-PROJECTINTERNALID sy-vline 
WA_NETWORK_ACTIVITY_NODE_REL_ST_STR-OBJECTISCONFIRMED sy-vline 
WA_NETWORK_ACTIVITY_NODE_REL_ST_STR-OBJECTISPARTIALLYCONFIRMED sy-vline 
WA_NETWORK_ACTIVITY_NODE_REL_ST_STR-TOTALFLOATFORBASICDATES sy-vline 
WA_NETWORK_ACTIVITY_NODE_REL_ST_STR-TOTALFLOATFORFORECASTEDDATES sy-vline 
WA_NETWORK_ACTIVITY_NODE_REL_ST_STR-PRODAVAILYCHECKPLANNINGTYPE sy-vline 
WA_NETWORK_ACTIVITY_NODE_REL_ST_STR-PLANT sy-vline 
WA_NETWORK_ACTIVITY_NODE_REL_ST_STR-WORKCENTERINTERNALID sy-vline 
WA_NETWORK_ACTIVITY_NODE_REL_ST_STR-WORKCENTER sy-vline 
WA_NETWORK_ACTIVITY_NODE_REL_ST_STR-HAS_SUCCESSOR sy-vline 
WA_NETWORK_ACTIVITY_NODE_REL_ST_STR-HAS_PREDECESSOR sy-vline 
WA_NETWORK_ACTIVITY_NODE_REL_ST_STR-IS_CRITICAL_BASIC sy-vline 
WA_NETWORK_ACTIVITY_NODE_REL_ST_STR-IS_CRITICAL_FORECAST sy-vline      INTO ld_text SEPARATED BY SPACE.

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