ABAP Select data from SAP table SNIWE1 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP SNIWE1 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 SNIWE1. 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 SNIWE1 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_SNIWE1 TYPE STANDARD TABLE OF SNIWE1,
      WA_SNIWE1 TYPE SNIWE1,
      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: <SNIWE1> TYPE SNIWE1.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_SNIWE1.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM SNIWE1
  INTO TABLE IT_SNIWE1.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM SNIWE1
*  INTO TABLE @DATA(IT_SNIWE12).
*--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_SNIWE1 INDEX 1 INTO DATA(WA_SNIWE12).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_SNIWE1 ASSIGNING <SNIWE1>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<SNIWE1>-MTAGE = 1.
<SNIWE1>-DISPO = 1.
<SNIWE1>-KORDI = 1.
<SNIWE1>-VONDI = 1.
<SNIWE1>-BISDI = 1.

ENDLOOP.

LOOP AT IT_SNIWE1 INTO WA_SNIWE1.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_SNIWE1-PROGN, sy-vline,
  WA_SNIWE1-VONPR, sy-vline,
  WA_SNIWE1-BISPR, sy-vline,
  WA_SNIWE1-KORPR, sy-vline,
  WA_SNIWE1-NOPROGN, sy-vline,
  WA_SNIWE1-USERX, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_SNIWE1 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_SNIWE1 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_SNIWE1 INTO WA_SNIWE1.


*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_SNIWE1_STR, 
MTAGE TYPE STRING,
DISPO TYPE STRING,
KORDI TYPE STRING,
VONDI TYPE STRING,
BISDI TYPE STRING,
PROGN TYPE STRING,
VONPR TYPE STRING,
BISPR TYPE STRING,
KORPR TYPE STRING,
NOPROGN TYPE STRING,
USERX TYPE STRING,
VONST TYPE STRING,
BISST TYPE STRING,
RESER TYPE STRING,
BESTB TYPE STRING,
EXCP1 TYPE STRING,
B1VVJ TYPE STRING,
B1VOJ TYPE STRING,
B1VVM TYPE STRING,
B1VOM TYPE STRING,
B2VOJ TYPE STRING,
B2VOM TYPE STRING,
B2CUR TYPE STRING,
EXCP2 TYPE STRING,
VONRC TYPE STRING,
BISRC TYPE STRING,
PRZRC TYPE STRING,
B3VVJ TYPE STRING,
B3VOJ TYPE STRING,
B3VVM TYPE STRING,
B3VOM TYPE STRING,
B3CUR TYPE STRING,
B3AVR TYPE STRING,
EXCP3 TYPE STRING,
ERSDA TYPE STRING,END OF T_EKKO_STR.
DATA: WA_SNIWE1_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_SNIWE1_STR-MTAGE sy-vline 
WA_SNIWE1_STR-DISPO sy-vline 
WA_SNIWE1_STR-KORDI sy-vline 
WA_SNIWE1_STR-VONDI sy-vline 
WA_SNIWE1_STR-BISDI sy-vline 
WA_SNIWE1_STR-PROGN sy-vline 
WA_SNIWE1_STR-VONPR sy-vline 
WA_SNIWE1_STR-BISPR sy-vline 
WA_SNIWE1_STR-KORPR sy-vline 
WA_SNIWE1_STR-NOPROGN sy-vline 
WA_SNIWE1_STR-USERX sy-vline 
WA_SNIWE1_STR-VONST sy-vline 
WA_SNIWE1_STR-BISST sy-vline 
WA_SNIWE1_STR-RESER sy-vline 
WA_SNIWE1_STR-BESTB sy-vline 
WA_SNIWE1_STR-EXCP1 sy-vline 
WA_SNIWE1_STR-B1VVJ sy-vline 
WA_SNIWE1_STR-B1VOJ sy-vline 
WA_SNIWE1_STR-B1VVM sy-vline 
WA_SNIWE1_STR-B1VOM sy-vline 
WA_SNIWE1_STR-B2VOJ sy-vline 
WA_SNIWE1_STR-B2VOM sy-vline 
WA_SNIWE1_STR-B2CUR sy-vline 
WA_SNIWE1_STR-EXCP2 sy-vline 
WA_SNIWE1_STR-VONRC sy-vline 
WA_SNIWE1_STR-BISRC sy-vline 
WA_SNIWE1_STR-PRZRC sy-vline 
WA_SNIWE1_STR-B3VVJ sy-vline 
WA_SNIWE1_STR-B3VOJ sy-vline 
WA_SNIWE1_STR-B3VVM sy-vline 
WA_SNIWE1_STR-B3VOM sy-vline 
WA_SNIWE1_STR-B3CUR sy-vline 
WA_SNIWE1_STR-B3AVR sy-vline 
WA_SNIWE1_STR-EXCP3 sy-vline 
WA_SNIWE1_STR-ERSDA sy-vline      INTO ld_text SEPARATED BY SPACE.

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