ABAP Select data from SAP table NALIRS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM NALIRS
*  INTO TABLE @DATA(IT_NALIRS2).
*--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_NALIRS INDEX 1 INTO DATA(WA_NALIRS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<NALIRS>-TABIX = 1.
<NALIRS>-COLOR = 1.
<NALIRS>-SELFL = 1.
<NALIRS>-ACSTNO = 1.
<NALIRS>-CHNGTYPE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_NALIRS-KSCHL, sy-vline,
  WA_NALIRS-ERDAT, sy-vline,
  WA_NALIRS-NACHA, sy-vline,
  WA_NALIRS-VSTAT, sy-vline,
  WA_NALIRS-USNAM, sy-vline,
  WA_NALIRS-CUSTNO_PR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_NALIRS 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_NALIRS 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_NALIRS INTO WA_NALIRS.


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

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

*Conversion exit ALPHA, internal->external for field PARNO
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_NALIRS-PARNO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_NALIRS-PARNO.
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_NALIRS_STR, 
TABIX TYPE STRING,
COLOR TYPE STRING,
SELFL TYPE STRING,
ACSTNO TYPE STRING,
CHNGTYPE TYPE STRING,
KSCHL TYPE STRING,
ERDAT TYPE STRING,
NACHA TYPE STRING,
VSTAT TYPE STRING,
USNAM TYPE STRING,
CUSTNO_PR TYPE STRING,
SUPPNO_PR TYPE STRING,
MATCUSTNO TYPE STRING,
MATSUPPNO TYPE STRING,
MATGR TYPE STRING,
BALDATE TYPE STRING,
BALDATE_OLD TYPE STRING,
ACCTNO TYPE STRING,
PARTYP TYPE STRING,
PARNO TYPE STRING,END OF T_EKKO_STR.
DATA: WA_NALIRS_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_NALIRS_STR-TABIX sy-vline 
WA_NALIRS_STR-COLOR sy-vline 
WA_NALIRS_STR-SELFL sy-vline 
WA_NALIRS_STR-ACSTNO sy-vline 
WA_NALIRS_STR-CHNGTYPE sy-vline 
WA_NALIRS_STR-KSCHL sy-vline 
WA_NALIRS_STR-ERDAT sy-vline 
WA_NALIRS_STR-NACHA sy-vline 
WA_NALIRS_STR-VSTAT sy-vline 
WA_NALIRS_STR-USNAM sy-vline 
WA_NALIRS_STR-CUSTNO_PR sy-vline 
WA_NALIRS_STR-SUPPNO_PR sy-vline 
WA_NALIRS_STR-MATCUSTNO sy-vline 
WA_NALIRS_STR-MATSUPPNO sy-vline 
WA_NALIRS_STR-MATGR sy-vline 
WA_NALIRS_STR-BALDATE sy-vline 
WA_NALIRS_STR-BALDATE_OLD sy-vline 
WA_NALIRS_STR-ACCTNO sy-vline 
WA_NALIRS_STR-PARTYP sy-vline 
WA_NALIRS_STR-PARNO sy-vline      INTO ld_text SEPARATED BY SPACE.

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