ABAP Select data from SAP table S901 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP S901 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 S901. 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 S901 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_S901 TYPE STANDARD TABLE OF S901,
      WA_S901 TYPE S901,
      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: <S901> TYPE S901.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_S901.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM S901
  INTO TABLE IT_S901.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM S901
*  INTO TABLE @DATA(IT_S9012).
*--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_S901 INDEX 1 INTO DATA(WA_S9012).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_S901 ASSIGNING <S901>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<S901>-MANDT = 1.
<S901>-SSOUR = 1.
<S901>-VRSIO = 1.
<S901>-SPMON = 1.
<S901>-SPTAG = 1.

ENDLOOP.

LOOP AT IT_S901 INTO WA_S901.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_S901-SPWOC, sy-vline,
  WA_S901-SPBUP, sy-vline,
  WA_S901-AUART, sy-vline,
  WA_S901-KUNUM, sy-vline,
  WA_S901-TPLNR, sy-vline,
  WA_S901-EQUNR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_S901 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_S901 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_S901 INTO WA_S901.


*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.

*Conversion exit PERI, internal->external for field SPMON
CALL FUNCTION 'CONVERSION_EXIT_PERI_OUTPUT'
  EXPORTING
    input =                      WA_S901-SPMON
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_S901-SPMON.
WRITE:/ 'New Value:', ld_input.

*Conversion exit PERI, internal->external for field SPWOC
CALL FUNCTION 'CONVERSION_EXIT_PERI_OUTPUT'
  EXPORTING
    input =                      WA_S901-SPWOC
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_S901-SPWOC.
WRITE:/ 'New Value:', ld_input.

*Conversion exit PERI, internal->external for field SPBUP
CALL FUNCTION 'CONVERSION_EXIT_PERI_OUTPUT'
  EXPORTING
    input =                      WA_S901-SPBUP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_S901-SPBUP.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KUNUM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_S901-KUNUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_S901-KUNUM.
WRITE:/ 'New Value:', ld_input.

*Conversion exit TPLNR, internal->external for field TPLNR
CALL FUNCTION 'CONVERSION_EXIT_TPLNR_OUTPUT'
  EXPORTING
    input =                      WA_S901-TPLNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_S901-TPLNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field EQUNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_S901-EQUNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_S901-EQUNR.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

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

TYPES: BEGIN OF T_S901_STR, 
MANDT TYPE STRING,
SSOUR TYPE STRING,
VRSIO TYPE STRING,
SPMON TYPE STRING,
SPTAG TYPE STRING,
SPWOC TYPE STRING,
SPBUP TYPE STRING,
AUART TYPE STRING,
KUNUM TYPE STRING,
TPLNR TYPE STRING,
EQUNR TYPE STRING,
PERIV TYPE STRING,
VWDAT TYPE STRING,
WAERS TYPE STRING,
IAOFN TYPE STRING,
IAABG TYPE STRING,
USER4 TYPE STRING,
IAKOSPLAN TYPE STRING,
IAKOSIST TYPE STRING,
IAPERKOSE TYPE STRING,
IAPERKOSF TYPE STRING,
IAMATKOSE TYPE STRING,
IAMATKOSF TYPE STRING,
IADIENKOS TYPE STRING,
IASONKOST TYPE STRING,
IAERTRAG TYPE STRING,
ZZGARANT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_S901_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_S901_STR-MANDT sy-vline 
WA_S901_STR-SSOUR sy-vline 
WA_S901_STR-VRSIO sy-vline 
WA_S901_STR-SPMON sy-vline 
WA_S901_STR-SPTAG sy-vline 
WA_S901_STR-SPWOC sy-vline 
WA_S901_STR-SPBUP sy-vline 
WA_S901_STR-AUART sy-vline 
WA_S901_STR-KUNUM sy-vline 
WA_S901_STR-TPLNR sy-vline 
WA_S901_STR-EQUNR sy-vline 
WA_S901_STR-PERIV sy-vline 
WA_S901_STR-VWDAT sy-vline 
WA_S901_STR-WAERS sy-vline 
WA_S901_STR-IAOFN sy-vline 
WA_S901_STR-IAABG sy-vline 
WA_S901_STR-USER4 sy-vline 
WA_S901_STR-IAKOSPLAN sy-vline 
WA_S901_STR-IAKOSIST sy-vline 
WA_S901_STR-IAPERKOSE sy-vline 
WA_S901_STR-IAPERKOSF sy-vline 
WA_S901_STR-IAMATKOSE sy-vline 
WA_S901_STR-IAMATKOSF sy-vline 
WA_S901_STR-IADIENKOS sy-vline 
WA_S901_STR-IASONKOST sy-vline 
WA_S901_STR-IAERTRAG sy-vline 
WA_S901_STR-ZZGARANT sy-vline      INTO ld_text SEPARATED BY SPACE.

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