ABAP Select data from SAP table SNAP into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM SNAP
*  INTO TABLE @DATA(IT_SNAP2).
*--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_SNAP INDEX 1 INTO DATA(WA_SNAP2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<SNAP>-DATUM = 1.
<SNAP>-UZEIT = 1.
<SNAP>-AHOST = 1.
<SNAP>-UNAME = 1.
<SNAP>-MANDT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_SNAP-MODNO, sy-vline,
  WA_SNAP-SEQNO, sy-vline,
  WA_SNAP-XHOLD, sy-vline,
  WA_SNAP-FLIST, sy-vline,
  WA_SNAP-FLIST02, sy-vline,
  WA_SNAP-FLIST03, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_SNAP 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_SNAP 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_SNAP INTO WA_SNAP.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_SNAP_STR, 
DATUM TYPE STRING,
UZEIT TYPE STRING,
AHOST TYPE STRING,
UNAME TYPE STRING,
MANDT TYPE STRING,
MODNO TYPE STRING,
SEQNO TYPE STRING,
XHOLD TYPE STRING,
FLIST TYPE STRING,
FLIST02 TYPE STRING,
FLIST03 TYPE STRING,
FLIST04 TYPE STRING,
FLIST05 TYPE STRING,
FLIST06 TYPE STRING,
FLIST07 TYPE STRING,
FLIST08 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_SNAP_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_SNAP_STR-DATUM sy-vline 
WA_SNAP_STR-UZEIT sy-vline 
WA_SNAP_STR-AHOST sy-vline 
WA_SNAP_STR-UNAME sy-vline 
WA_SNAP_STR-MANDT sy-vline 
WA_SNAP_STR-MODNO sy-vline 
WA_SNAP_STR-SEQNO sy-vline 
WA_SNAP_STR-XHOLD sy-vline 
WA_SNAP_STR-FLIST sy-vline 
WA_SNAP_STR-FLIST02 sy-vline 
WA_SNAP_STR-FLIST03 sy-vline 
WA_SNAP_STR-FLIST04 sy-vline 
WA_SNAP_STR-FLIST05 sy-vline 
WA_SNAP_STR-FLIST06 sy-vline 
WA_SNAP_STR-FLIST07 sy-vline 
WA_SNAP_STR-FLIST08 sy-vline      INTO ld_text SEPARATED BY SPACE.

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