ABAP Select data from SAP table T090 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP T090 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 T090. 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 T090 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_T090 TYPE STANDARD TABLE OF T090,
      WA_T090 TYPE T090,
      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: <T090> TYPE T090.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_T090.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM T090
  INTO TABLE IT_T090.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM T090
*  INTO TABLE @DATA(IT_T0902).
*--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_T090 INDEX 1 INTO DATA(WA_T0902).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_T090 ASSIGNING <T090>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<T090>-MANDT = 1.
<T090>-AFARSL = 1.
<T090>-GBEGIN = 1.
<T090>-AFATYP = 1.
<T090>-XAFAUT = 1.

ENDLOOP.

LOOP AT IT_T090 INTO WA_T090.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_T090-DEGFAK, sy-vline,
  WA_T090-MAXPRZ, sy-vline,
  WA_T090-MINPRZ, sy-vline,
  WA_T090-UMAFSL, sy-vline,
  WA_T090-UMRPRZ, sy-vline,
  WA_T090-XSTILL, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_T090 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_T090 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_T090 INTO WA_T090.


*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_T090_STR, 
MANDT TYPE STRING,
AFARSL TYPE STRING,
GBEGIN TYPE STRING,
AFATYP TYPE STRING,
XAFAUT TYPE STRING,
DEGFAK TYPE STRING,
MAXPRZ TYPE STRING,
MINPRZ TYPE STRING,
UMAFSL TYPE STRING,
UMRPRZ TYPE STRING,
XSTILL TYPE STRING,
XENDAU TYPE STRING,
XUNTNL TYPE STRING,
XEFDAU TYPE STRING,
PERBZU TYPE STRING,
PERBNA TYPE STRING,
PERBAB TYPE STRING,
PERBUM TYPE STRING,
XDAILY TYPE STRING,
XLIFEC TYPE STRING,
XAFNAH TYPE STRING,
XBZDAT TYPE STRING,
UMSTM TYPE STRING,
AFACLA TYPE STRING,
AFAMET TYPE STRING,
XRAFA TYPE STRING,
MSFAKR TYPE STRING,
SCHROTT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_T090_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_T090_STR-MANDT sy-vline 
WA_T090_STR-AFARSL sy-vline 
WA_T090_STR-GBEGIN sy-vline 
WA_T090_STR-AFATYP sy-vline 
WA_T090_STR-XAFAUT sy-vline 
WA_T090_STR-DEGFAK sy-vline 
WA_T090_STR-MAXPRZ sy-vline 
WA_T090_STR-MINPRZ sy-vline 
WA_T090_STR-UMAFSL sy-vline 
WA_T090_STR-UMRPRZ sy-vline 
WA_T090_STR-XSTILL sy-vline 
WA_T090_STR-XENDAU sy-vline 
WA_T090_STR-XUNTNL sy-vline 
WA_T090_STR-XEFDAU sy-vline 
WA_T090_STR-PERBZU sy-vline 
WA_T090_STR-PERBNA sy-vline 
WA_T090_STR-PERBAB sy-vline 
WA_T090_STR-PERBUM sy-vline 
WA_T090_STR-XDAILY sy-vline 
WA_T090_STR-XLIFEC sy-vline 
WA_T090_STR-XAFNAH sy-vline 
WA_T090_STR-XBZDAT sy-vline 
WA_T090_STR-UMSTM sy-vline 
WA_T090_STR-AFACLA sy-vline 
WA_T090_STR-AFAMET sy-vline 
WA_T090_STR-XRAFA sy-vline 
WA_T090_STR-MSFAKR sy-vline 
WA_T090_STR-SCHROTT sy-vline      INTO ld_text SEPARATED BY SPACE.

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