ABAP Select data from SAP table SNIWEFY into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM SNIWEFY
*  INTO TABLE @DATA(IT_SNIWEFY2).
*--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_SNIWEFY INDEX 1 INTO DATA(WA_SNIWEFY2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<SNIWEFY>-STPER = 1.
<SNIWEFY>-LFPER = 1.
<SNIWEFY>-H1PER = 1.
<SNIWEFY>-H2PER = 1.
<SNIWEFY>-S1PER = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_SNIWEFY-S2PER, sy-vline,
  WA_SNIWEFY-VMPER, sy-vline,
  WA_SNIWEFY-VVMPR, sy-vline,
  WA_SNIWEFY-VJPER, sy-vline,
  WA_SNIWEFY-VVJPR, sy-vline,
  WA_SNIWEFY-AKPER, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_SNIWEFY 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_SNIWEFY 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_SNIWEFY INTO WA_SNIWEFY.


*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_SNIWEFY_STR, 
STPER TYPE STRING,
LFPER TYPE STRING,
H1PER TYPE STRING,
H2PER TYPE STRING,
S1PER TYPE STRING,
S2PER TYPE STRING,
VMPER TYPE STRING,
VVMPR TYPE STRING,
VJPER TYPE STRING,
VVJPR TYPE STRING,
AKPER TYPE STRING,
AKDAT TYPE STRING,
VJFLG TYPE STRING,
LODAT TYPE STRING,
HIDAT TYPE STRING,
WAERS TYPE STRING,
MVERS TYPE STRING,
XVPER TYPE STRING,
XVVPR TYPE STRING,
XVJAH TYPE STRING,
XVVJA TYPE STRING,END OF T_EKKO_STR.
DATA: WA_SNIWEFY_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_SNIWEFY_STR-STPER sy-vline 
WA_SNIWEFY_STR-LFPER sy-vline 
WA_SNIWEFY_STR-H1PER sy-vline 
WA_SNIWEFY_STR-H2PER sy-vline 
WA_SNIWEFY_STR-S1PER sy-vline 
WA_SNIWEFY_STR-S2PER sy-vline 
WA_SNIWEFY_STR-VMPER sy-vline 
WA_SNIWEFY_STR-VVMPR sy-vline 
WA_SNIWEFY_STR-VJPER sy-vline 
WA_SNIWEFY_STR-VVJPR sy-vline 
WA_SNIWEFY_STR-AKPER sy-vline 
WA_SNIWEFY_STR-AKDAT sy-vline 
WA_SNIWEFY_STR-VJFLG sy-vline 
WA_SNIWEFY_STR-LODAT sy-vline 
WA_SNIWEFY_STR-HIDAT sy-vline 
WA_SNIWEFY_STR-WAERS sy-vline 
WA_SNIWEFY_STR-MVERS sy-vline 
WA_SNIWEFY_STR-XVPER sy-vline 
WA_SNIWEFY_STR-XVVPR sy-vline 
WA_SNIWEFY_STR-XVJAH sy-vline 
WA_SNIWEFY_STR-XVVJA sy-vline      INTO ld_text SEPARATED BY SPACE.

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