ABAP Select data from SAP table SNIWE8 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP SNIWE8 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 SNIWE8. 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 SNIWE8 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_SNIWE8 TYPE STANDARD TABLE OF SNIWE8,
      WA_SNIWE8 TYPE SNIWE8,
      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: <SNIWE8> TYPE SNIWE8.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_SNIWE8.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM SNIWE8
  INTO TABLE IT_SNIWE8.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM SNIWE8
*  INTO TABLE @DATA(IT_SNIWE82).
*--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_SNIWE8 INDEX 1 INTO DATA(WA_SNIWE82).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_SNIWE8 ASSIGNING <SNIWE8>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<SNIWE8>-MY_LOWER = 1.
<SNIWE8>-MY_UPPER = 1.
<SNIWE8>-SCHWERT = 1.
<SNIWE8>-ABSOL = 1.
<SNIWE8>-TITLE = 1.

ENDLOOP.

LOOP AT IT_SNIWE8 INTO WA_SNIWE8.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_SNIWE8-MVERS, sy-vline,
  WA_SNIWE8-CBPRS, sy-vline,
  WA_SNIWE8-NULLPRS1, sy-vline,
  WA_SNIWE8-CBPS1, sy-vline,
  WA_SNIWE8-NULLPRS2, sy-vline,
  WA_SNIWE8-CVJBS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_SNIWE8 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_SNIWE8 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_SNIWE8 INTO WA_SNIWE8.


*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_SNIWE8_STR, 
MY_LOWER TYPE STRING,
MY_UPPER TYPE STRING,
SCHWERT TYPE STRING,
ABSOL TYPE STRING,
TITLE TYPE STRING,
MVERS TYPE STRING,
CBPRS TYPE STRING,
NULLPRS1 TYPE STRING,
CBPS1 TYPE STRING,
NULLPRS2 TYPE STRING,
CVJBS TYPE STRING,
NULLPRS3 TYPE STRING,
CBPRH TYPE STRING,
NULLPRH1 TYPE STRING,
CBPH1 TYPE STRING,
NULLPRH2 TYPE STRING,
CVJBH TYPE STRING,
NULLPRH3 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_SNIWE8_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_SNIWE8_STR-MY_LOWER sy-vline 
WA_SNIWE8_STR-MY_UPPER sy-vline 
WA_SNIWE8_STR-SCHWERT sy-vline 
WA_SNIWE8_STR-ABSOL sy-vline 
WA_SNIWE8_STR-TITLE sy-vline 
WA_SNIWE8_STR-MVERS sy-vline 
WA_SNIWE8_STR-CBPRS sy-vline 
WA_SNIWE8_STR-NULLPRS1 sy-vline 
WA_SNIWE8_STR-CBPS1 sy-vline 
WA_SNIWE8_STR-NULLPRS2 sy-vline 
WA_SNIWE8_STR-CVJBS sy-vline 
WA_SNIWE8_STR-NULLPRS3 sy-vline 
WA_SNIWE8_STR-CBPRH sy-vline 
WA_SNIWE8_STR-NULLPRH1 sy-vline 
WA_SNIWE8_STR-CBPH1 sy-vline 
WA_SNIWE8_STR-NULLPRH2 sy-vline 
WA_SNIWE8_STR-CVJBH sy-vline 
WA_SNIWE8_STR-NULLPRH3 sy-vline      INTO ld_text SEPARATED BY SPACE.

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