ABAP Select data from SAP table NALIWT into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM NALIWT
*  INTO TABLE @DATA(IT_NALIWT2).
*--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_NALIWT INDEX 1 INTO DATA(WA_NALIWT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<NALIWT>-TABIX = 1.
<NALIWT>-COLOR = 1.
<NALIWT>-SELFL = 1.
<NALIWT>-TKONN = 1.
<NALIWT>-TPOSN = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_NALIWT-TPOSN_SUB, sy-vline,
  WA_NALIWT-KUNNR, sy-vline,
  WA_NALIWT-NAME1_KUNNR, sy-vline,
  WA_NALIWT-ELIFN, sy-vline,
  WA_NALIWT-NAME1_LIFNR, sy-vline,
  WA_NALIWT-BUKRS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_NALIWT 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_NALIWT 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_NALIWT INTO WA_NALIWT.


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

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

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

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_NALIWT-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_NALIWT-MATNR.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit ALPHA, internal->external for field KOSTL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_NALIWT-KOSTL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_NALIWT-KOSTL.
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_NALIWT_STR, 
TABIX TYPE STRING,
COLOR TYPE STRING,
SELFL TYPE STRING,
TKONN TYPE STRING,
TPOSN TYPE STRING,
TPOSN_SUB TYPE STRING,
KUNNR TYPE STRING,
NAME1_KUNNR TYPE STRING,
ELIFN TYPE STRING,
NAME1_LIFNR TYPE STRING,
BUKRS TYPE STRING,
VKORG TYPE STRING,
BEZEI_VKORG TYPE STRING,
VTWEG TYPE STRING,
BEZEI_VTWEG TYPE STRING,
SPART TYPE STRING,
BEZEI_SPART TYPE STRING,
VKGRP TYPE STRING,
BEZEI_VKGRP TYPE STRING,
VKBUR TYPE STRING,
BEZEI_VKBUR TYPE STRING,
EKORG TYPE STRING,
BEZEI_EKORG TYPE STRING,
EKGRP TYPE STRING,
BEZEI_EKGRP TYPE STRING,
TKSACHB TYPE STRING,
MATNR TYPE STRING,
ARKTX TYPE STRING,
MATKL TYPE STRING,
BEZEI_MATKL TYPE STRING,
GSBER TYPE STRING,
BEZEI_GSBER TYPE STRING,
KOKRS TYPE STRING,
KKBER TYPE STRING,
PRCTR TYPE STRING,
KOSTL TYPE STRING,
TCTYP TYPE STRING,
BEZEI_TCTYP TYPE STRING,
BTBSTA TYPE STRING,
BEZEI_STATUS TYPE STRING,
PARVW TYPE STRING,
PNAME TYPE STRING,
KSCHL TYPE STRING,
NACHA TYPE STRING,END OF T_EKKO_STR.
DATA: WA_NALIWT_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_NALIWT_STR-TABIX sy-vline 
WA_NALIWT_STR-COLOR sy-vline 
WA_NALIWT_STR-SELFL sy-vline 
WA_NALIWT_STR-TKONN sy-vline 
WA_NALIWT_STR-TPOSN sy-vline 
WA_NALIWT_STR-TPOSN_SUB sy-vline 
WA_NALIWT_STR-KUNNR sy-vline 
WA_NALIWT_STR-NAME1_KUNNR sy-vline 
WA_NALIWT_STR-ELIFN sy-vline 
WA_NALIWT_STR-NAME1_LIFNR sy-vline 
WA_NALIWT_STR-BUKRS sy-vline 
WA_NALIWT_STR-VKORG sy-vline 
WA_NALIWT_STR-BEZEI_VKORG sy-vline 
WA_NALIWT_STR-VTWEG sy-vline 
WA_NALIWT_STR-BEZEI_VTWEG sy-vline 
WA_NALIWT_STR-SPART sy-vline 
WA_NALIWT_STR-BEZEI_SPART sy-vline 
WA_NALIWT_STR-VKGRP sy-vline 
WA_NALIWT_STR-BEZEI_VKGRP sy-vline 
WA_NALIWT_STR-VKBUR sy-vline 
WA_NALIWT_STR-BEZEI_VKBUR sy-vline 
WA_NALIWT_STR-EKORG sy-vline 
WA_NALIWT_STR-BEZEI_EKORG sy-vline 
WA_NALIWT_STR-EKGRP sy-vline 
WA_NALIWT_STR-BEZEI_EKGRP sy-vline 
WA_NALIWT_STR-TKSACHB sy-vline 
WA_NALIWT_STR-MATNR sy-vline 
WA_NALIWT_STR-ARKTX sy-vline 
WA_NALIWT_STR-MATKL sy-vline 
WA_NALIWT_STR-BEZEI_MATKL sy-vline 
WA_NALIWT_STR-GSBER sy-vline 
WA_NALIWT_STR-BEZEI_GSBER sy-vline 
WA_NALIWT_STR-KOKRS sy-vline 
WA_NALIWT_STR-KKBER sy-vline 
WA_NALIWT_STR-PRCTR sy-vline 
WA_NALIWT_STR-KOSTL sy-vline 
WA_NALIWT_STR-TCTYP sy-vline 
WA_NALIWT_STR-BEZEI_TCTYP sy-vline 
WA_NALIWT_STR-BTBSTA sy-vline 
WA_NALIWT_STR-BEZEI_STATUS sy-vline 
WA_NALIWT_STR-PARVW sy-vline 
WA_NALIWT_STR-PNAME sy-vline 
WA_NALIWT_STR-KSCHL sy-vline 
WA_NALIWT_STR-NACHA sy-vline      INTO ld_text SEPARATED BY SPACE.

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