ABAP Select data from SAP table IFNETRELEX into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP IFNETRELEX 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 IFNETRELEX. 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 IFNETRELEX 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_IFNETRELEX TYPE STANDARD TABLE OF IFNETRELEX,
      WA_IFNETRELEX TYPE IFNETRELEX,
      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: <IFNETRELEX> TYPE IFNETRELEX.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM IFNETRELEX
*  INTO TABLE @DATA(IT_IFNETRELEX2).
*--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_IFNETRELEX INDEX 1 INTO DATA(WA_IFNETRELEX2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<IFNETRELEX>-NETZPL_VOR = 1.
<IFNETRELEX>-VORN1 = 1.
<IFNETRELEX>-NETZPL_NCH = 1.
<IFNETRELEX>-VORN2 = 1.
<IFNETRELEX>-AOBAR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_IFNETRELEX-ZEINH, sy-vline,
  WA_IFNETRELEX-DAUER, sy-vline,
  WA_IFNETRELEX-KALID, sy-vline,
  WA_IFNETRELEX-PRZNT, sy-vline,
  WA_IFNETRELEX-PROVG, sy-vline,
  WA_IFNETRELEX-ARBPL, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_IFNETRELEX 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_IFNETRELEX 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_IFNETRELEX INTO WA_IFNETRELEX.


*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 NETZPL_VOR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_IFNETRELEX-NETZPL_VOR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IFNETRELEX-NETZPL_VOR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit NUMCV, internal->external for field VORN1
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_IFNETRELEX-VORN1
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IFNETRELEX-VORN1.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit NUMCV, internal->external for field VORN2
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_IFNETRELEX-VORN2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IFNETRELEX-VORN2.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AOBAR, internal->external for field AOBAR
CALL FUNCTION 'CONVERSION_EXIT_AOBAR_OUTPUT'
  EXPORTING
    input =                      WA_IFNETRELEX-AOBAR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IFNETRELEX-AOBAR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field ZEINH
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_IFNETRELEX-ZEINH
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IFNETRELEX-ZEINH.
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_IFNETRELEX_STR, 
NETZPL_VOR TYPE STRING,
VORN1 TYPE STRING,
NETZPL_NCH TYPE STRING,
VORN2 TYPE STRING,
AOBAR TYPE STRING,
ZEINH TYPE STRING,
DAUER TYPE STRING,
KALID TYPE STRING,
PRZNT TYPE STRING,
PROVG TYPE STRING,
ARBPL TYPE STRING,
WERKS TYPE STRING,
FSABD TYPE STRING,
FSABZ TYPE STRING,
SSABD TYPE STRING,
SSABZ TYPE STRING,
FEABD TYPE STRING,
FEABZ TYPE STRING,
SEABD TYPE STRING,
SEABZ TYPE STRING,
LOEKZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_IFNETRELEX_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_IFNETRELEX_STR-NETZPL_VOR sy-vline 
WA_IFNETRELEX_STR-VORN1 sy-vline 
WA_IFNETRELEX_STR-NETZPL_NCH sy-vline 
WA_IFNETRELEX_STR-VORN2 sy-vline 
WA_IFNETRELEX_STR-AOBAR sy-vline 
WA_IFNETRELEX_STR-ZEINH sy-vline 
WA_IFNETRELEX_STR-DAUER sy-vline 
WA_IFNETRELEX_STR-KALID sy-vline 
WA_IFNETRELEX_STR-PRZNT sy-vline 
WA_IFNETRELEX_STR-PROVG sy-vline 
WA_IFNETRELEX_STR-ARBPL sy-vline 
WA_IFNETRELEX_STR-WERKS sy-vline 
WA_IFNETRELEX_STR-FSABD sy-vline 
WA_IFNETRELEX_STR-FSABZ sy-vline 
WA_IFNETRELEX_STR-SSABD sy-vline 
WA_IFNETRELEX_STR-SSABZ sy-vline 
WA_IFNETRELEX_STR-FEABD sy-vline 
WA_IFNETRELEX_STR-FEABZ sy-vline 
WA_IFNETRELEX_STR-SEABD sy-vline 
WA_IFNETRELEX_STR-SEABZ sy-vline 
WA_IFNETRELEX_STR-LOEKZ sy-vline      INTO ld_text SEPARATED BY SPACE.

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