ABAP Select data from SAP table SNIWEL into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM SNIWEL
*  INTO TABLE @DATA(IT_SNIWEL2).
*--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_SNIWEL INDEX 1 INTO DATA(WA_SNIWEL2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<SNIWEL>-UPDAT = 1.
<SNIWEL>-1BPRS = 1.
<SNIWEL>-1BPS1 = 1.
<SNIWEL>-1VJBS = 1.
<SNIWEL>-1BPRH = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_SNIWEL-1BPH1, sy-vline,
  WA_SNIWEL-1VJBH, sy-vline,
  WA_SNIWEL-2BPRS, sy-vline,
  WA_SNIWEL-2BPS1, sy-vline,
  WA_SNIWEL-2VJBS, sy-vline,
  WA_SNIWEL-2BPRH, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_SNIWEL 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_SNIWEL 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_SNIWEL INTO WA_SNIWEL.


*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_SNIWEL_STR, 
UPDAT TYPE STRING,
1BPRS TYPE STRING,
1BPS1 TYPE STRING,
1VJBS TYPE STRING,
1BPRH TYPE STRING,
1BPH1 TYPE STRING,
1VJBH TYPE STRING,
2BPRS TYPE STRING,
2BPS1 TYPE STRING,
2VJBS TYPE STRING,
2BPRH TYPE STRING,
2BPH1 TYPE STRING,
2VJBH TYPE STRING,
3BPRS TYPE STRING,
3BPS1 TYPE STRING,
3VJBS TYPE STRING,
3BPRH TYPE STRING,
3BPH1 TYPE STRING,
3VJBH TYPE STRING,
1MTPR TYPE STRING,
2MTPR TYPE STRING,
3MTPR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_SNIWEL_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_SNIWEL_STR-UPDAT sy-vline 
WA_SNIWEL_STR-1BPRS sy-vline 
WA_SNIWEL_STR-1BPS1 sy-vline 
WA_SNIWEL_STR-1VJBS sy-vline 
WA_SNIWEL_STR-1BPRH sy-vline 
WA_SNIWEL_STR-1BPH1 sy-vline 
WA_SNIWEL_STR-1VJBH sy-vline 
WA_SNIWEL_STR-2BPRS sy-vline 
WA_SNIWEL_STR-2BPS1 sy-vline 
WA_SNIWEL_STR-2VJBS sy-vline 
WA_SNIWEL_STR-2BPRH sy-vline 
WA_SNIWEL_STR-2BPH1 sy-vline 
WA_SNIWEL_STR-2VJBH sy-vline 
WA_SNIWEL_STR-3BPRS sy-vline 
WA_SNIWEL_STR-3BPS1 sy-vline 
WA_SNIWEL_STR-3VJBS sy-vline 
WA_SNIWEL_STR-3BPRH sy-vline 
WA_SNIWEL_STR-3BPH1 sy-vline 
WA_SNIWEL_STR-3VJBH sy-vline 
WA_SNIWEL_STR-1MTPR sy-vline 
WA_SNIWEL_STR-2MTPR sy-vline 
WA_SNIWEL_STR-3MTPR sy-vline      INTO ld_text SEPARATED BY SPACE.

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