ABAP Select data from SAP table NALIGENERIC_1ST into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP NALIGENERIC_1ST 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 NALIGENERIC_1ST. 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 NALIGENERIC_1ST 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_NALIGENERIC_1ST TYPE STANDARD TABLE OF NALIGENERIC_1ST,
      WA_NALIGENERIC_1ST TYPE NALIGENERIC_1ST,
      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: <NALIGENERIC_1ST> TYPE NALIGENERIC_1ST.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_NALIGENERIC_1ST.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM NALIGENERIC_1ST
  INTO TABLE IT_NALIGENERIC_1ST.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM NALIGENERIC_1ST
*  INTO TABLE @DATA(IT_NALIGENERIC_1ST2).
*--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_NALIGENERIC_1ST INDEX 1 INTO DATA(WA_NALIGENERIC_1ST2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_NALIGENERIC_1ST ASSIGNING <NALIGENERIC_1ST>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<NALIGENERIC_1ST>-TABIX = 1.
<NALIGENERIC_1ST>-COLOR = 1.
<NALIGENERIC_1ST>-SELFL = 1.
<NALIGENERIC_1ST>-KAPPL = 1.
<NALIGENERIC_1ST>-OBJKY = 1.

ENDLOOP.

LOOP AT IT_NALIGENERIC_1ST INTO WA_NALIGENERIC_1ST.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_NALIGENERIC_1ST-KSCHL, sy-vline,
  WA_NALIGENERIC_1ST-NACHA, sy-vline,
  WA_NALIGENERIC_1ST-PARVW, sy-vline,
  WA_NALIGENERIC_1ST-PARNR, sy-vline,
  WA_NALIGENERIC_1ST-VSTAT, sy-vline,
  WA_NALIGENERIC_1ST-SPRAS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_NALIGENERIC_1ST 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_NALIGENERIC_1ST 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_NALIGENERIC_1ST INTO WA_NALIGENERIC_1ST.


*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 PARNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_NALIGENERIC_1ST-PARNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_NALIGENERIC_1ST-PARNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ISOLA, internal->external for field SPRAS
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_NALIGENERIC_1ST-SPRAS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_NALIGENERIC_1ST-SPRAS.
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_NALIGENERIC_1ST_STR, 
TABIX TYPE STRING,
COLOR TYPE STRING,
SELFL TYPE STRING,
KAPPL TYPE STRING,
OBJKY TYPE STRING,
KSCHL TYPE STRING,
NACHA TYPE STRING,
PARVW TYPE STRING,
PARNR TYPE STRING,
VSTAT TYPE STRING,
SPRAS TYPE STRING,
AENDE TYPE STRING,
ERDAT TYPE STRING,
ERUHR TYPE STRING,
SORT1 TYPE STRING,
SORT2 TYPE STRING,
SORT3 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_NALIGENERIC_1ST_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_NALIGENERIC_1ST_STR-TABIX sy-vline 
WA_NALIGENERIC_1ST_STR-COLOR sy-vline 
WA_NALIGENERIC_1ST_STR-SELFL sy-vline 
WA_NALIGENERIC_1ST_STR-KAPPL sy-vline 
WA_NALIGENERIC_1ST_STR-OBJKY sy-vline 
WA_NALIGENERIC_1ST_STR-KSCHL sy-vline 
WA_NALIGENERIC_1ST_STR-NACHA sy-vline 
WA_NALIGENERIC_1ST_STR-PARVW sy-vline 
WA_NALIGENERIC_1ST_STR-PARNR sy-vline 
WA_NALIGENERIC_1ST_STR-VSTAT sy-vline 
WA_NALIGENERIC_1ST_STR-SPRAS sy-vline 
WA_NALIGENERIC_1ST_STR-AENDE sy-vline 
WA_NALIGENERIC_1ST_STR-ERDAT sy-vline 
WA_NALIGENERIC_1ST_STR-ERUHR sy-vline 
WA_NALIGENERIC_1ST_STR-SORT1 sy-vline 
WA_NALIGENERIC_1ST_STR-SORT2 sy-vline 
WA_NALIGENERIC_1ST_STR-SORT3 sy-vline      INTO ld_text SEPARATED BY SPACE.

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