ABAP Select data from SAP table SNAST into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM SNAST
*  INTO TABLE @DATA(IT_SNAST2).
*--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_SNAST INDEX 1 INTO DATA(WA_SNAST2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<SNAST>-MANDT = 1.
<SNAST>-KSCHL = 1.
<SNAST>-SPRAS = 1.
<SNAST>-ADRNR = 1.
<SNAST>-NACHA = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_SNAST-ANZAL, sy-vline,
  WA_SNAST-VSDAT, sy-vline,
  WA_SNAST-VSURA, sy-vline,
  WA_SNAST-TCODE, sy-vline,
  WA_SNAST-USNAM, sy-vline,
  WA_SNAST-LDEST, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_SNAST 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_SNAST 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_SNAST INTO WA_SNAST.


*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_SNAST-SPRAS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_SNAST-SPRAS.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit SPDEV, internal->external for field LDEST
CALL FUNCTION 'CONVERSION_EXIT_SPDEV_OUTPUT'
  EXPORTING
    input =                      WA_SNAST-LDEST
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_SNAST-LDEST.
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_SNAST_STR, 
MANDT TYPE STRING,
KSCHL TYPE STRING,
SPRAS TYPE STRING,
ADRNR TYPE STRING,
NACHA TYPE STRING,
ANZAL TYPE STRING,
VSDAT TYPE STRING,
VSURA TYPE STRING,
TCODE TYPE STRING,
USNAM 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,
PFLD4 TYPE STRING,
PFLD5 TYPE STRING,
TDNAME TYPE STRING,
SNDDR TYPE STRING,
SNDBC TYPE STRING,
FORFB TYPE STRING,
PRIFB TYPE STRING,
TDRECEIVER TYPE STRING,
TDDIVISION TYPE STRING,
TDOCOVER TYPE STRING,
TDCOVTITLE TYPE STRING,
TDAUTORITY TYPE STRING,
TDARMOD 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,END OF T_EKKO_STR.
DATA: WA_SNAST_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_SNAST_STR-MANDT sy-vline 
WA_SNAST_STR-KSCHL sy-vline 
WA_SNAST_STR-SPRAS sy-vline 
WA_SNAST_STR-ADRNR sy-vline 
WA_SNAST_STR-NACHA sy-vline 
WA_SNAST_STR-ANZAL sy-vline 
WA_SNAST_STR-VSDAT sy-vline 
WA_SNAST_STR-VSURA sy-vline 
WA_SNAST_STR-TCODE sy-vline 
WA_SNAST_STR-USNAM sy-vline 
WA_SNAST_STR-LDEST sy-vline 
WA_SNAST_STR-DSNAM sy-vline 
WA_SNAST_STR-DSUF1 sy-vline 
WA_SNAST_STR-DSUF2 sy-vline 
WA_SNAST_STR-DIMME sy-vline 
WA_SNAST_STR-DELET sy-vline 
WA_SNAST_STR-TELFX sy-vline 
WA_SNAST_STR-TELX1 sy-vline 
WA_SNAST_STR-PFLD4 sy-vline 
WA_SNAST_STR-PFLD5 sy-vline 
WA_SNAST_STR-TDNAME sy-vline 
WA_SNAST_STR-SNDDR sy-vline 
WA_SNAST_STR-SNDBC sy-vline 
WA_SNAST_STR-FORFB sy-vline 
WA_SNAST_STR-PRIFB sy-vline 
WA_SNAST_STR-TDRECEIVER sy-vline 
WA_SNAST_STR-TDDIVISION sy-vline 
WA_SNAST_STR-TDOCOVER sy-vline 
WA_SNAST_STR-TDCOVTITLE sy-vline 
WA_SNAST_STR-TDAUTORITY sy-vline 
WA_SNAST_STR-TDARMOD sy-vline 
WA_SNAST_STR-USRNAM sy-vline 
WA_SNAST_STR-EVENT sy-vline 
WA_SNAST_STR-SORT1 sy-vline 
WA_SNAST_STR-SORT2 sy-vline 
WA_SNAST_STR-SORT3 sy-vline 
WA_SNAST_STR-OBJTYPE sy-vline 
WA_SNAST_STR-TDSCHEDULE sy-vline 
WA_SNAST_STR-TLAND sy-vline      INTO ld_text SEPARATED BY SPACE.

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