ABAP Select data from SAP table NAST 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 NAST 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 NAST. 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 NAST 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_NAST TYPE STANDARD TABLE OF NAST,
      WA_NAST TYPE NAST,
      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: <NAST> TYPE NAST.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM NAST
*  INTO TABLE @DATA(IT_NAST2).
*--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_NAST INDEX 1 INTO DATA(WA_NAST2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<NAST>-MANDT = 1.
<NAST>-KAPPL = 1.
<NAST>-OBJKY = 1.
<NAST>-KSCHL = 1.
<NAST>-SPRAS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_NAST-PARNR, sy-vline,
  WA_NAST-PARVW, sy-vline,
  WA_NAST-ERDAT, sy-vline,
  WA_NAST-ERUHR, sy-vline,
  WA_NAST-ADRNR, sy-vline,
  WA_NAST-NACHA, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_NAST 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_NAST 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_NAST INTO WA_NAST.


*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 ISOLA, internal->external for field SPRAS
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_NAST-SPRAS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_NAST-SPRAS.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit SPDEV, internal->external for field LDEST
CALL FUNCTION 'CONVERSION_EXIT_SPDEV_OUTPUT'
  EXPORTING
    input =                      WA_NAST-LDEST
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_NAST-LDEST.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ISOLA, internal->external for field TDSPRAS
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_NAST-TDSPRAS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_NAST-TDSPRAS.
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_NAST_STR, 
MANDT TYPE STRING,
KAPPL TYPE STRING,
OBJKY TYPE STRING,
KSCHL TYPE STRING,
SPRAS TYPE STRING,
PARNR TYPE STRING,
PARVW TYPE STRING,
ERDAT TYPE STRING,
ERUHR TYPE STRING,
ADRNR TYPE STRING,
NACHA TYPE STRING,
ANZAL TYPE STRING,
VSZTP TYPE STRING,
VSDAT TYPE STRING,
VSURA TYPE STRING,
VSURB TYPE STRING,
MANUE TYPE STRING,
DATVR TYPE STRING,
UHRVR TYPE STRING,
DATRE TYPE STRING,
USNAM TYPE STRING,
VSTAT TYPE STRING,
AKTIV TYPE STRING,
TCODE TYPE STRING,
LDEST TYPE STRING,
DSNAM TYPE STRING,
DSUF1 TYPE STRING,
DSUF2 TYPE STRING,
DIMME TYPE STRING,
DELET TYPE STRING,
TELFX TYPE STRING,
TELX1 TYPE STRING,
TELTX TYPE STRING,
AENDE TYPE STRING,
REPET TYPE STRING,
REPID TYPE STRING,
PFLD1 TYPE STRING,
PFLD2 TYPE STRING,
PFLD3 TYPE STRING,
PFLD4 TYPE STRING,
PFLD5 TYPE STRING,
PMID1 TYPE STRING,
PMID2 TYPE STRING,
PMID3 TYPE STRING,
PMID4 TYPE STRING,
PMID5 TYPE STRING,
TDNAME TYPE STRING,
TDID TYPE STRING,
TDSPRAS TYPE STRING,
EDIKEY TYPE STRING,
EDITRANS TYPE STRING,
SNDDR TYPE STRING,
SNDEX TYPE STRING,
SNDCP TYPE STRING,
SNDBC TYPE STRING,
FORFB TYPE STRING,
PRIFB TYPE STRING,
ACALL TYPE STRING,
OBJAC TYPE STRING,
OBJRR TYPE STRING,
OBJRN TYPE STRING,
OUTFL TYPE STRING,
OBJSNS TYPE STRING,
OBJPRI TYPE STRING,
OBJCP TYPE STRING,
NAUTO TYPE STRING,
TDRECEIVER TYPE STRING,
TDDIVISION TYPE STRING,
TDOCOVER TYPE STRING,
TDCOVTITLE TYPE STRING,
TDAUTORITY TYPE STRING,
TDARMOD TYPE STRING,
OPTARCNR TYPE STRING,
CMFPNR TYPE STRING,
USRNAM TYPE STRING,
EVENT TYPE STRING,
SORT1 TYPE STRING,
SORT2 TYPE STRING,
SORT3 TYPE STRING,
OBJTYPE TYPE STRING,
TDSCHEDULE TYPE STRING,
TLAND TYPE STRING,
_DATAAGING TYPE STRING,END OF T_EKKO_STR.
DATA: WA_NAST_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_NAST_STR-MANDT sy-vline 
WA_NAST_STR-KAPPL sy-vline 
WA_NAST_STR-OBJKY sy-vline 
WA_NAST_STR-KSCHL sy-vline 
WA_NAST_STR-SPRAS sy-vline 
WA_NAST_STR-PARNR sy-vline 
WA_NAST_STR-PARVW sy-vline 
WA_NAST_STR-ERDAT sy-vline 
WA_NAST_STR-ERUHR sy-vline 
WA_NAST_STR-ADRNR sy-vline 
WA_NAST_STR-NACHA sy-vline 
WA_NAST_STR-ANZAL sy-vline 
WA_NAST_STR-VSZTP sy-vline 
WA_NAST_STR-VSDAT sy-vline 
WA_NAST_STR-VSURA sy-vline 
WA_NAST_STR-VSURB sy-vline 
WA_NAST_STR-MANUE sy-vline 
WA_NAST_STR-DATVR sy-vline 
WA_NAST_STR-UHRVR sy-vline 
WA_NAST_STR-DATRE sy-vline 
WA_NAST_STR-USNAM sy-vline 
WA_NAST_STR-VSTAT sy-vline 
WA_NAST_STR-AKTIV sy-vline 
WA_NAST_STR-TCODE sy-vline 
WA_NAST_STR-LDEST sy-vline 
WA_NAST_STR-DSNAM sy-vline 
WA_NAST_STR-DSUF1 sy-vline 
WA_NAST_STR-DSUF2 sy-vline 
WA_NAST_STR-DIMME sy-vline 
WA_NAST_STR-DELET sy-vline 
WA_NAST_STR-TELFX sy-vline 
WA_NAST_STR-TELX1 sy-vline 
WA_NAST_STR-TELTX sy-vline 
WA_NAST_STR-AENDE sy-vline 
WA_NAST_STR-REPET sy-vline 
WA_NAST_STR-REPID sy-vline 
WA_NAST_STR-PFLD1 sy-vline 
WA_NAST_STR-PFLD2 sy-vline 
WA_NAST_STR-PFLD3 sy-vline 
WA_NAST_STR-PFLD4 sy-vline 
WA_NAST_STR-PFLD5 sy-vline 
WA_NAST_STR-PMID1 sy-vline 
WA_NAST_STR-PMID2 sy-vline 
WA_NAST_STR-PMID3 sy-vline 
WA_NAST_STR-PMID4 sy-vline 
WA_NAST_STR-PMID5 sy-vline 
WA_NAST_STR-TDNAME sy-vline 
WA_NAST_STR-TDID sy-vline 
WA_NAST_STR-TDSPRAS sy-vline 
WA_NAST_STR-EDIKEY sy-vline 
WA_NAST_STR-EDITRANS sy-vline 
WA_NAST_STR-SNDDR sy-vline 
WA_NAST_STR-SNDEX sy-vline 
WA_NAST_STR-SNDCP sy-vline 
WA_NAST_STR-SNDBC sy-vline 
WA_NAST_STR-FORFB sy-vline 
WA_NAST_STR-PRIFB sy-vline 
WA_NAST_STR-ACALL sy-vline 
WA_NAST_STR-OBJAC sy-vline 
WA_NAST_STR-OBJRR sy-vline 
WA_NAST_STR-OBJRN sy-vline 
WA_NAST_STR-OUTFL sy-vline 
WA_NAST_STR-OBJSNS sy-vline 
WA_NAST_STR-OBJPRI sy-vline 
WA_NAST_STR-OBJCP sy-vline 
WA_NAST_STR-NAUTO sy-vline 
WA_NAST_STR-TDRECEIVER sy-vline 
WA_NAST_STR-TDDIVISION sy-vline 
WA_NAST_STR-TDOCOVER sy-vline 
WA_NAST_STR-TDCOVTITLE sy-vline 
WA_NAST_STR-TDAUTORITY sy-vline 
WA_NAST_STR-TDARMOD sy-vline 
WA_NAST_STR-OPTARCNR sy-vline 
WA_NAST_STR-CMFPNR sy-vline 
WA_NAST_STR-USRNAM sy-vline 
WA_NAST_STR-EVENT sy-vline 
WA_NAST_STR-SORT1 sy-vline 
WA_NAST_STR-SORT2 sy-vline 
WA_NAST_STR-SORT3 sy-vline 
WA_NAST_STR-OBJTYPE sy-vline 
WA_NAST_STR-TDSCHEDULE sy-vline 
WA_NAST_STR-TLAND sy-vline 
WA_NAST_STR-_DATAAGING sy-vline      INTO ld_text SEPARATED BY SPACE.

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