ABAP Select data from SAP table NALIWRI 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 NALIWRI 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 NALIWRI. 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 NALIWRI 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_NALIWRI TYPE STANDARD TABLE OF NALIWRI,
      WA_NALIWRI TYPE NALIWRI,
      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: <NALIWRI> TYPE NALIWRI.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM NALIWRI
*  INTO TABLE @DATA(IT_NALIWRI2).
*--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_NALIWRI INDEX 1 INTO DATA(WA_NALIWRI2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<NALIWRI>-TABIX = 1.
<NALIWRI>-COLOR = 1.
<NALIWRI>-SELFL = 1.
<NALIWRI>-WBELN_RL = 1.
<NALIWRI>-POSNR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_NALIWRI-WBELN, sy-vline,
  WA_NALIWRI-LFART, sy-vline,
  WA_NALIWRI-LFART_TXT, sy-vline,
  WA_NALIWRI-LFTYP, sy-vline,
  WA_NALIWRI-VTEXT, sy-vline,
  WA_NALIWRI-WFDAT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_NALIWRI 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_NALIWRI 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_NALIWRI INTO WA_NALIWRI.


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

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

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

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

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

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

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

*Conversion exit ALPHA, internal->external for field ADRNR_AZ
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_NALIWRI-ADRNR_AZ
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_NALIWRI-ADRNR_AZ.
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_NALIWRI_STR, 
TABIX TYPE STRING,
COLOR TYPE STRING,
SELFL TYPE STRING,
WBELN_RL TYPE STRING,
POSNR TYPE STRING,
WBELN TYPE STRING,
LFART TYPE STRING,
LFART_TXT TYPE STRING,
LFTYP TYPE STRING,
VTEXT TYPE STRING,
WFDAT TYPE STRING,
BUKRS TYPE STRING,
VKORG TYPE STRING,
VTWEG TYPE STRING,
SPART TYPE STRING,
KUNRG TYPE STRING,
KRG_NAME1 TYPE STRING,
WAERL TYPE STRING,
NETWR TYPE STRING,
BRTWR TYPE STRING,
MWSBK TYPE STRING,
RFBSK TYPE STRING,
RFBSK_TXT TYPE STRING,
ZTERM TYPE STRING,
ZLSCH TYPE STRING,
BLDAT TYPE STRING,
WFDAT_RL TYPE STRING,
ZUONR TYPE STRING,
XBLNR TYPE STRING,
ERDAT TYPE STRING,
ERNAM TYPE STRING,
ARCHIV TYPE STRING,
SELKZ TYPE STRING,
ADRNR_RE TYPE STRING,
ADDR_TYPE_RE TYPE STRING,
ADRNP_RE TYPE STRING,
ADRNR_RS TYPE STRING,
ADRNR_RG TYPE STRING,
ADRNR_AZ TYPE STRING,
PARVW TYPE STRING,
PNAME TYPE STRING,
KSCHL TYPE STRING,
NACHA TYPE STRING,END OF T_EKKO_STR.
DATA: WA_NALIWRI_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_NALIWRI_STR-TABIX sy-vline 
WA_NALIWRI_STR-COLOR sy-vline 
WA_NALIWRI_STR-SELFL sy-vline 
WA_NALIWRI_STR-WBELN_RL sy-vline 
WA_NALIWRI_STR-POSNR sy-vline 
WA_NALIWRI_STR-WBELN sy-vline 
WA_NALIWRI_STR-LFART sy-vline 
WA_NALIWRI_STR-LFART_TXT sy-vline 
WA_NALIWRI_STR-LFTYP sy-vline 
WA_NALIWRI_STR-VTEXT sy-vline 
WA_NALIWRI_STR-WFDAT sy-vline 
WA_NALIWRI_STR-BUKRS sy-vline 
WA_NALIWRI_STR-VKORG sy-vline 
WA_NALIWRI_STR-VTWEG sy-vline 
WA_NALIWRI_STR-SPART sy-vline 
WA_NALIWRI_STR-KUNRG sy-vline 
WA_NALIWRI_STR-KRG_NAME1 sy-vline 
WA_NALIWRI_STR-WAERL sy-vline 
WA_NALIWRI_STR-NETWR sy-vline 
WA_NALIWRI_STR-BRTWR sy-vline 
WA_NALIWRI_STR-MWSBK sy-vline 
WA_NALIWRI_STR-RFBSK sy-vline 
WA_NALIWRI_STR-RFBSK_TXT sy-vline 
WA_NALIWRI_STR-ZTERM sy-vline 
WA_NALIWRI_STR-ZLSCH sy-vline 
WA_NALIWRI_STR-BLDAT sy-vline 
WA_NALIWRI_STR-WFDAT_RL sy-vline 
WA_NALIWRI_STR-ZUONR sy-vline 
WA_NALIWRI_STR-XBLNR sy-vline 
WA_NALIWRI_STR-ERDAT sy-vline 
WA_NALIWRI_STR-ERNAM sy-vline 
WA_NALIWRI_STR-ARCHIV sy-vline 
WA_NALIWRI_STR-SELKZ sy-vline 
WA_NALIWRI_STR-ADRNR_RE sy-vline 
WA_NALIWRI_STR-ADDR_TYPE_RE sy-vline 
WA_NALIWRI_STR-ADRNP_RE sy-vline 
WA_NALIWRI_STR-ADRNR_RS sy-vline 
WA_NALIWRI_STR-ADRNR_RG sy-vline 
WA_NALIWRI_STR-ADRNR_AZ sy-vline 
WA_NALIWRI_STR-PARVW sy-vline 
WA_NALIWRI_STR-PNAME sy-vline 
WA_NALIWRI_STR-KSCHL sy-vline 
WA_NALIWRI_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.